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Archive for the ‘zero gravity chair’ Category

1: The vertical and horizontal motions of a projectile are:
The same
Inversely proportional to one another
Directly proportional to one another
Independent of one another

2: The range of a projectile depends upon the acceleration due to gravity and upon both components of the initial:
Force
Position
Velocity
Acceleration

3: The angle that results in the maximum range of a projectile is:
180 deg.
30 deg.
45 deg.
60 deg

4: An arrow is shot at 30.0 degrees above the horizontal. Its initial velocity is 49 m/s and it hits the target. What is the maximum height the arrow will attain?
49 m
25 m
75 m
30 m

5: In question # 4, if the target is at the same height from which the arrow was shot, how far away is the target?
1.1 x 104m
2.1 x 104m
1.1 x 102m
2.1 x 102m

6: A dart player throws a dart horizontally at a speed of 12.4 m/s. The dart hits the board 0.32m below the height from which it was thrown. How much time does it take for the dart to hit the board?
2.6 s
3.2 s
4.5 s
0.8 s

7: A basketball player tries to make a half court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51 degrees, 14.0m from the basket, what speed must the player give the ball?
140 m/s
9.4 m/s
11.8 m/s
13.3 m/s

8: The range of a projectile launched at an angle is the same for which two angles?
15 degrees and 75 degrees
45 degrees and 30 degrees
45 degrees and 60 degrees
Answers b and c only

9: A ball is thrown at an angle of 66.0 degrees above the horizontal with an initial velocity of 4.47 m/s. What is the maximum height the ball attains?
1.532 m
1.698 m
0.849 m
2.55 m

10: In question # 9, what is the range of the ball thrown. (hint: use x = R; so x = vx0t)
1.51 m
3.02 m
1.36 m
1.70 m

11: In which of the following examples is a net force of zero acting on the object in question? I. A car drives around a circular racetrack at a constant speed. II. A person pushes on a door to hold it shut. III. A ball, rolling across a grassy field, comes to a stop.
I only
II only
III only
I and II

12: In figure 1 above a block is suspended from two ropes, so that it hangs motionless in the air. If the magnitude of T2 is 10.0 N, what is the magnitude of T1?
.500 N
0.866 N
10.0 N
17.3 N

13: A 50 kg crate rests on the floor. The coefficient of static friction is 0.5. The force parallel to the floor needed to move the crates is most nearly:
50 N
125 N
250 N
500 N

14: A person is pushing an object of mass m along the ground with a force F. The coefficient of kinetic friction between the object and the ground is (mu)k. The object is accelerating, but then the person stops pushing and the object slides to a halt. The person then starts pushing again with a force F, but the object doesn’t budge. The maximum coefficient of static friction between the object and ground is ms. Which of the following statements is true?
F>(mu)k/(mu)s
(mu)kmgsmg
(mu)smg=F
The scenario described is physically impossible.

15: A 1 kg mass on a frictionless inclined plane is connected by a pulley to a hanging 5.0 kg mass, as in figure 2 above. At what angle will the system be in equilibrium? (in degrees)
-45
-30
30
45

16: A man of mass 80 kg sits in a chair. What it the magnitude of the normal force exerted on the man by the chair?
70.2 N
80 N
89.8 N
784 N

17: A force F acts on object A of mass m1. An identical force acts on object B of mass m2. A experiences acceleration a1 and B experiences acceleration a2. If a2 = 2a1, what is m2 in terms of m1?
1/2 m1
m1
2m1
4m1

18: Which is a vector quantity?
distance
speed
power
force

19: A granite block is being slid at a constant speed across a horizontal concrete floor by a force parallel to the floor. Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete?
mass and speed of the block
mass and normal force on the block
frictional force and speed of the block
frictional force and normal force on the block

20: After a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. Neglecting air resistancce, what is the approximate maximum height reached by the rocket?
49m
98m
120m
250m

21: What term describes how well the results of an experiment agree with the standard value?
Accuracy
Precision
Uncertainty
Reproducibility

22: Which of the following is the largest number?
1.23 E+4
1.23 x 10^4
12300
all of the above

23: The measurement 0.001234 g has how many significant digits?
4
2
3
1

24: According to graphing convention, the values of the dependent variable are plotted
vertically (on the x-axis).
vertically (on the y-axis).
horizontally (on the x-axis).
horizontally (on the y-axis).

25: Which of the following, is a place where you mightfind a physicist working?
high schools
hospitals
Wall Street
all of the above

Please help me with this, I am so far behind, I will fail the class if I dont get this done.?
1: The vertical and horizontal motions of a projectile are:

Independent of one another

2: The range of a projectile depends upon the acceleration due to gravity and upon both components of the initial:

Velocity

3: The angle that results in the maximum range of a projectile is:

45 deg.

4: An arrow is shot at 30.0 degrees above the horizontal. Its initial velocity is 49 m/s and it hits the target. What is the maximum height the arrow will attain?

30 m

5: In question # 4, if the target is at the same height from which the arrow was shot, how far away is the target?

212 m

6: A dart player throws a dart horizontally at a speed of 12.4 m/s. The dart hits the board 0.32m below the height from which it was thrown. How much time does it take for the dart to hit the board?

0.26 sec

7: A basketball player tries to make a half court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51 degrees, 14.0m from the basket, what speed must the player give the ball?

11.8 m/s

8: The range of a projectile launched at an angle is the same for which two angles?
15 degrees and 75 degrees

9: A ball is thrown at an angle of 66.0 degrees above the horizontal with an initial velocity of 4.47 m/s. What is the maximum height the ball attains?

0.849 m

10: In question # 9, what is the range of the ball thrown. (hint: use x = R; so x = vx0t)

1.70 m

11: In which of the following examples is a net force of zero acting on the object in question? I. A car drives around a circular racetrack at a constant speed. II. A person pushes on a door to hold it shut. III. A ball, rolling across a grassy field, comes to a stop.

I and II

12: In figure 1 above a block is suspended from two ropes, so that it hangs motionless in the air. If the magnitude of T2 is 10.0 N, what is the magnitude of T1?
.500 N
0.866 N
10.0 N
17.3 N

There is no figure 1

13: A 50 kg crate rests on the floor. The coefficient of static friction is 0.5. The force parallel to the floor needed to move the crates is most nearly:

250 N

14: A person is pushing an object of mass m along the ground with a force F. The coefficient of kinetic friction between the object and the ground is (mu)k. The object is accelerating, but then the person stops pushing and the object slides to a halt. The person then starts pushing again with a force F, but the object doesn’t budge. The maximum coefficient of static friction between the object and ground is ms. Which of the following statements is true?
F>(mu)k/(mu)s
(mu)kmgsmg
(mu)smg=F
The scenario described is physically impossible.

The answers are unintelligble

15: A 1 kg mass on a frictionless inclined plane is connected by a pulley to a hanging 5.0 kg mass, as in figure 2 above. At what angle will the system be in equilibrium? (in degrees)
-45
-30
30
45

No Figure 2

16: A man of mass 80 kg sits in a chair. What it the magnitude of the normal force exerted on the man by the chair?

784 N

17: A force F acts on object A of mass m1. An identical force acts on object B of mass m2. A experiences acceleration a1 and B experiences acceleration a2. If a2 = 2a1, what is m2 in terms of m1?
1/2 m1

18: Which is a vector quantity?

force

19: A granite block is being slid at a constant speed across a horizontal concrete floor by a force parallel to the floor. Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete

frictional force and normal force on the block

20: After a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. Neglecting air resistancce, what is the approximate maximum height reached by the rocket?

120m

21: What term describes how well the results of an experiment agree with the standard value?
Accuracy
Precision
Uncertainty
Reproducibility

Bunch of gobble d gook. They are asking what your book says.

22: Which of the following is the largest number?

all of the above

23: The measurement 0.001234 g has how many significant digits?

3 (actually 4, but with number beginning with "1" you usually round down)

24: According to graphing convention, the values of the dependent variable are plotted

vertically (on the x-axis).
vertically (on the y-axis).
horizontally (on the x-axis).
horizontally (on the y-axis).

Despite many years of education, I can never figure this out without really thinking. (I can never tell right from left, which I think is the reason).

25: Which of the following, is a place where you mightfind a physicist working?

all of the above

http://www.uship.com/furniture

Ask a moving company if they have any moves between the two locations. If so, see how much they would charge you to add your chair to the truck. Someone better be there when the truck arrives to retrieve the chair if you don’t want it to get lost.

1.) The vertical and horizontal motions of a projectile are:

2.) The range of a projectile depends upon the acceleration due to gravity and upon both components of the initial:

3.) The angle that results in the maximum range of a projectile is:

4.) An arrow is shot at 30.0 degrees above the horizontal. Its initial velocity is 49 m/s and it hits the target. What is the maximum height the arrow will attain?

5.) In question # 4, if the target is at the same height from which the arrow was shot, how far away is the target?

6.) A dart player throws a dart horizontally at a speed of 12.4 m/s. The dart hits the board 0.32m below the height from which it was thrown. How much time does it take for the dart to hit the board?

7.) A basketball player tries to make a half court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51 degrees, 14.0m from the basket, what speed must the player give the ball?

8.) The range of a projectile launched at an angle is the same for which two angles?

A ball is thrown at an angle of 66.0 degrees above the horizontal with an initial velocity of 4.47 m/s. What is the maximum height the ball attains?

10.) In question # 9, what is the range of the ball thrown. (hint: use x = R; so x = vx0t)

11.) In which of the following examples is a net force of zero acting on the object in question? I. A car drives around a circular racetrack at a constant speed. II. A person pushes on a door to hold it shut. III. A ball, rolling across a grassy field, comes to a stop.

12.) In figure 1 above a block is suspended from two ropes, so that it hangs motionless in the air. If the magnitude of T2 is 10.0 N, what is the magnitude of T1?

13.) A 50 kg crate rests on the floor. The coefficient of static friction is 0.5. The force parallel to the floor needed to move the crates is most nearly:

14.) A person is pushing an object of mass m along the ground with a force F. The coefficient of kinetic friction between the object and the ground is (mu)k. The object is accelerating, but then the person stops pushing and the object slides to a halt. The person then starts pushing again with a force F, but the object doesn’t budge. The maximum coefficient of static friction between the object and ground is ms.

15.) A 1 kg mass on a frictionless inclined plane is connected by a pulley to a hanging 0.5 kg mass, as in figure 2 above. At what angle will the system be in equilibrium? (in degrees)

16.) A man of mass 80 kg sits in a chair. What it the magnitude of the normal force exerted on the man by the chair?

17.) A force F acts on object A of mass m1. An identical force acts on object B of mass m2. A experiences acceleration a1 and B experiences acceleration a2. If a2 = 2a1, what is m2 in terms of m1?

18.) Which is a vector quantity?

19.) A granite block is being slid at a constant speed across a horizontal concrete floor by a force parallel to the floor. Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete?

20.) After a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. Neglecting air resistancce, what is the approximate maximum height reached by the rocket?

21.) What term describes how well the results of an experiment agree with the standard value?

Accuracy
Precision
Uncertainty
Reproducibility

22.) Which of the following is the largest number?
1.23 E+4
1.23 x 10^4
12300
all of the above

23.) The measurement 0.001234 g has how many significant digits?

24.) According to graphing convention, the values of the dependent variable are plotted

25.) Which of the following, is a place where you mightfind a physicist working?
high schools
hospitals
Wall Street
all of the above

1)Independent
2)velocity
3)45*
4)H = (usinA*)^2/2g
=>H = (49 x sin30*)^2/(2 x 9.8)
=>H = 7.66m
5)R = u^2sin2A/g
=>R = [(49)^2 x sin60*]/9.8
=>R = 212.18m
6)By s = ut + 1/2gt^2
=>0.32 = 0 + 1/2 x 9.8 x t^2
=>t = sqrt[0.065] = 0.26 sec
7)By R = u^2sin2A*/g
=>14 = u^2 x sin102*/9.8
=>u = sqrt[140.27] = 11.84 m/s
8)A* & (180* – A*)
9)H = (usinA*)^2/2g
=>H = (4.47 x sin66*)^2/(2 x 9.8)
=>H = 0.85m
10)R = u^2sin2A*/g
=>R = [(4.47)^2 x sin132*)/9.8
=>R = 1.52m
11)II. A person pushes on a door to hold it shut. [as displacement is zero]
12)Provide figure
13)Ff = coefficient of static friction x m x g
=>Ff = 0.5 x 50 x 9.8 = 245 N
14)The coefficient of static friction is always more than coefficient of kinetic friction
=>F is less than Ff(static)
15)For equilibrium:-
m1g – m2gsinA* = 0
=>0.5 x 9.8 – 1 x 9.8 x sinA* = 0
=>sinA* = 0.5 = sin30*
=>A* = 30*
16)F21 = F12 = mg = 80 x 9.8 = 784 N
17)By F = ma
=>a1 = F/m1 ——-(i)
=>a2 = F/m2 ——-(ii)
Given a2 = 2a1
=>F/m2 = 2F/m1
=>m1 = 2m2
18)Having magnitude & direction
19)F & W(=mg)
20)By s = ut + 1/2gt^2
=>s = 0 + 1/2 x 9.8 x (5)^2
=>s = 122.5m
21)Precision
22)all of the above [all are same]
23)4
24)horizontal & vertical axis
25)all of the above

Look on the chair where the adapter plugs in for the required voltage and current to operate the chair. Then you should be able to find a new ac adapter either here:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=590573&k=ac%20adapter

or here:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=589898&k=ac%20adapter

If those charts make no sense to you, then go to the store where you bought it or to their web site to try to buy one.

heya, here are 5 of a series of 30 multiple choice questions that I need some help on. Thanks a lot!

1. When several objects with different masses are droppped by an astronaut on the (airless) Moon, the resultunt motions:

A. Depend on densities of the objects, the one with the highest density falling fastest
B. Depend on densities of the objects, the one with the lowest density falling fastest
C. Depend on the masses of the objects, the least massive falling fastest
D. Depend on the masses of the objects, the most massive falling fastest
E. Are independent of the masses of the objects

2. An astronaut orbiting the Earth in the Space Shuttle feels weightless because:

A. At the location of the shuttle, the Earth’s gravitational force is repulsive.
B. Her mass is zero in space; however, weight requires mass.
C. Two forces are acting on her in opposite directions, so they cancel and produce the same effect as if no force at all were acting.
D. No forces are acting on her.
E.Only one force – gravity – acts on her, but gravity also accelerates the shuttle so that the shuttle does not push up on her to create the feeling of weight within it.

3. Which of the following pairs of forces is an example of an action-reaction pair by Newton’s third law?

A. For a tugboat pulling a barge, the force of the water on the barge and the force of the barge on the tugboat
B. For a dog pulling on its leash, the force of the dog on the leash and the force of the leash on the dog
C. For the solar system, the force of the Sun on Earth and the force of the Sun on Mars
D. For a student sitting on a chair, the weight of the student and the "normal" force that the chair exerts on the student
E. For a baseball player sliding into first base, the force of the baseball player on his shoes and the friction force of the ground on his shoes

4. Suppose we are having an exceptionally strong tide (a Spring Tide) right now. Approximately how long do we have to wait until we experience an exceptionally weak tide (Neap Tide)?

A. Two weeks
B. One year
C. One month
D. One week
E. Six hours

6. Which of the following five objects or persons is not accelerating?

A. A bicyclist gradually slowing down on a straight road while coasting toward a stop sign
B. An olympic swimmer exerting considerable force to maintain a constant speed in a straight line through the water
C. A motorcyclist traveling around a circular racetrack at a constant speed
D. An apple falling to the ground from an apple tree
E. Earth in its motion around the Sun

1. E. Are independent of the masses of the objects
Acceleration of gravity on the moon is 1.625 meters/sec^2

2. E.Only one force – gravity – acts on her, but gravity also accelerates the shuttle so that the shuttle does not push up on her to create the feeling of weight within it.

3. A., B., D., and E.

4. A. Two weeks

6. B. An olympic swimmer exerting considerable force to maintain a constant speed in a straight line through the water

The bicyclist in A. has negative acceleration. Acceleration is a vector force, so it has direction as well as magnitude

1) A rock is released from rest at the top of a 100-m-tall building. How long does the rock take to fall to the ground, and what is its imapact velocity. (*hint: we live on planet Earth where gravity (g=9.80 m/s^2).

2) A cannon ball is shot straight up with an inital speed of 100 m/s. How high does it go. (*hint: you need to use more than one formula because in order to get how high we need something else).

3) This problem is related to #2.
A ball is thrown vertically upward with a speed of 19.6 m/s.
a…What is the ball’s velocity and its height after 1second? After 2 seconds? After 3 seconds? After 4 seconds? And after 5 seconds? (*hint: unlike the previous question, here you don’t need to use an extra equation b/c I have given you time; where as in the previous question you needed to solve to time. But again, think of velocity of the ball at the very very very top for that split second.

b…Draw the ball’s velocity-vs-time graph.
(remember the time is on the x-axis of the graph and velocity is on the y-axis of the graph). Let’s make the time range from 0 seconds – 5 seconds.

4)
a…What constant acceleration, must a car have to go from zero to 26.82 m/s (60 mph) in 10 seconds?

b…How far has the car traveled when it reaches 60 mph?

5) Draw a free body diagram for the following:
-Book standing on top of the table.
-Dorian is pushing the book across the table where he exerts a force of 10N, make sure to include friction, which is opposite side of the motion/movement.
-You sit on the chair. Sum up the forces.
-You’re pulling a sled with 15N of force applies and making an angle 30 degree.

6) Calculate your weight on (a)Planet Earth. (b)Planet Mars.

First, some of these are level one problems… meaning, read the book and they’re easily done (actually all you need is the equations for some of them!) Second, if you really have problems, I recomend cramster.com instead of using up your precious points. They give you complete solutions to all the odd problems. (Sounds like your using Giancoli, they do have that Physics book and many other helpful ones).

here is my list of the bands and my fave from them, what’re yours? you won’t know ALOT of them but the ones you do, feel free to answer!!

A Perfect Circle – Pet
Abingdon Boys School – Strength
AFI – The Boy Who Destroyed The World
Akado – Бо(ль)га
Alice In Chains – Angry Chair
Audioslave – Cochise
Avenged Sevenfold – Bat Country
Bile – When The Dead Come Home
Billy Talent – Red Flag
Birds Of Tokyo – Silhouettic
Blink 182 – Rock Show
Deathstars – Blitzkrieg
Dethklok – Fan Song
Disturbed – Liberate
Eisenfunk – Paranoid
Evanescence – Wake Me Up Inside
Faith No More – Epic
Fear Factory – Zero Signal
Foxboro Hot Tubs – Sally
Gorillaz – Clint Eastwood
Gravity Kills – Goodbye
Green Day – Scattered
Guns N Roses – Mr Brownstone
Hanzel Und Gretyl – Kaizerreich
Hocico – Instincts Of Perversion
Iggy Pop And The Stooges – Search And Destroy
Killswitch Engage – My Curse
Kiss – Strutter
KMFDM – Risen
Lamb Of God – Laid To Rest
Life Cried – As We Decay
Linkin Park – From The Inside
Marilyn Manson – Rock Is Dead
Matchbook Romance – Monsters
Mindless Self Indulgence – Stupid MF
Mudvayne – Imn
Nirvana – Heart Shaped Box
No Doubt – Spiderwebs
Panic At The Disco – Build God Then We’ll Talk
Pantera – Cemetary Gates
Pearl Jam – Even Flow
Priestess – Talk To Her
Prodigy – Spitfire
Project 86 – Evil (A Chorus Of Resistance)
Psyclon Nine – Divine Infekt
Queens Of The Stone Age – 3’s & 7’s
Rage Against The Machine – Bombtrack
Red Hot Chili Peppers – Californication
Rise Against – Savior
Sepultura – Roots
Sick Puppies – Cancer
Skid Row – Youth Gone Wild
Skinny Puppy – Assimilate
Slayer – New Faith
Slipknot – Psychosocial
Smashing Pumpkins – Cherub Rock
Sonata Arctica – Fullmoon
Soulfly – Rise Of The Fallen
Static X – Kill Your Idols
Sum 41 – Fat Lip
System Of A Down – Toxicity
The Doors – Hello, I Love You
The Living End – Second Solution
The Network – Supermodel Robots
The White Stripes – Hardest Button To Button
Three Days Grace – Animal I’ve Become
Tool – Jimmy
Trivium – Kirisute Gomen
UVERworld – Gekidou
Zeromancer – Doppelganger I Love You

Most of these are right-now favourites…

Avenged Sevenfold – A Little Piece of Heaven
Bile – Manchurian Candy-Date
Billy Talent – Devil in a Midnight Mass
Blink 182 – What’s My Age Again?
Deathstars – Blood Stains Blondes
Disturbed – Liberate
Eisenfunk – Atomic Bomb
Evanescence – Missing
Fear Factory – Demanufacture
Gorillaz – 19-2000 (Soulchild Remix)
Gravity Kills – Blame
Green Day – Minority
Hanzel Und Gretyl – StarFucker
Hocico – Ecos (Move Bastard Mix)
Killswitch Engage – Hope Is…
KMFDM – Sucks
Lamb Of God – Contractor
Life Cried – Burnt To Ashes
Linkin Park – Faint
Marilyn Manson – Rock Is Dead
Matchbook Romance – Monsters
Mindless Self Indulgence – Tornado
Mudvayne – Not Falling
Nirvana – Something in the Way
No Doubt – Just a Girl
Pantera – 5 Minutes Alone
Prodigy – World’s On Fire
Psyclon Nine – As You Sleep
Rise Against – Give It All
Skinny Puppy – Assimilate
Slipknot – Surfacing
Static X – I’m With Stupid
Sum 41 – Fat Lip
System Of A Down – Violent Pornography
Three Days Grace – Animal I’ve Become
Zeromancer – Doctor Online (Rico Remix)

here is my list of the bands and my fave from them, what’re yours? you won’t know ALOT of them but the ones you do, feel free to answer!!

A Perfect Circle – Pet
Abingdon Boys School – Strength
AFI – The Boy Who Destroyed The World
Akado – Бо(ль)га
Alice In Chains – Angry Chair
Audioslave – Cochise
Avenged Sevenfold – Bat Country
Bile – When The Dead Come Home
Billy Talent – Red Flag
Birds Of Tokyo – Silhouettic
Blink 182 – Rock Show
Deathstars – Blitzkrieg
Dethklok – Fan Song
Disturbed – Liberate
Eisenfunk – Paranoid
Evanescence – Wake Me Up Inside
Faith No More – Epic
Fear Factory – Zero Signal
Foxboro Hot Tubs – Sally
Gorillaz – Clint Eastwood
Gravity Kills – Goodbye
Green Day – Scattered
Guns N Roses – Mr Brownstone
Hanzel Und Gretyl – Kaizerreich
Hocico – Instincts Of Perversion
Iggy Pop And The Stooges – Search And Destroy
Killswitch Engage – My Curse
Kiss – Strutter
KMFDM – Risen
Lamb Of God – Laid To Rest
Life Cried – As We Decay
Linkin Park – From The Inside
Marilyn Manson – Rock Is Dead
Matchbook Romance – Monsters
Mindless Self Indulgence – Stupid MF
Mudvayne – Imn
Nirvana – Heart Shaped Box
No Doubt – Spiderwebs
Panic At The Disco – Build God Then We’ll Talk
Pantera – Cemetary Gates
Pearl Jam – Even Flow
Priestess – Talk To Her
Prodigy – Spitfire
Project 86 – Evil (A Chorus Of Resistance)
Psyclon Nine – Divine Infekt
Queens Of The Stone Age – 3’s & 7’s
Rage Against The Machine – Bombtrack
Red Hot Chili Peppers – Californication
Rise Against – Savior
Sepultura – Roots
Sick Puppies – Cancer
Skid Row – Youth Gone Wild
Skinny Puppy – Assimilate
Slayer – New Faith
Slipknot – Psychosocial
Smashing Pumpkins – Cherub Rock
Sonata Arctica – Fullmoon
Soulfly – Rise Of The Fallen
Static X – Kill Your Idols
Sum 41 – Fat Lip
System Of A Down – Toxicity
The Doors – Hello, I Love You
The Living End – Second Solution
The Network – Supermodel Robots
The White Stripes – Hardest Button To Button
Three Days Grace – Animal I’ve Become
Tool – Jimmy
Trivium – Kirisute Gomen
UVERworld – Gekidou
Zeromancer – Doppelganger I Love You

Most of these are right-now favourites…

Avenged Sevenfold – A Little Piece of Heaven
Bile – Manchurian Candy-Date
Billy Talent – Devil in a Midnight Mass
Blink 182 – What’s My Age Again?
Deathstars – Blood Stains Blondes
Disturbed – Liberate
Eisenfunk – Atomic Bomb
Evanescence – Missing
Fear Factory – Demanufacture
Gorillaz – 19-2000 (Soulchild Remix)
Gravity Kills – Blame
Green Day – Minority
Hanzel Und Gretyl – StarFucker
Hocico – Ecos (Move Bastard Mix)
Killswitch Engage – Hope Is…
KMFDM – Sucks
Lamb Of God – Contractor
Life Cried – Burnt To Ashes
Linkin Park – Faint
Marilyn Manson – Rock Is Dead
Matchbook Romance – Monsters
Mindless Self Indulgence – Tornado
Mudvayne – Not Falling
Nirvana – Something in the Way
No Doubt – Just a Girl
Pantera – 5 Minutes Alone
Prodigy – World’s On Fire
Psyclon Nine – As You Sleep
Rise Against – Give It All
Skinny Puppy – Assimilate
Slipknot – Surfacing
Static X – I’m With Stupid
Sum 41 – Fat Lip
System Of A Down – Violent Pornography
Three Days Grace – Animal I’ve Become
Zeromancer – Doctor Online (Rico Remix)

I dont know if this is a trick question or what, any input will be greatly appreciated.

-Previously you’ve learned that if a body changes posistion, it has a non-zero speed. If the speed changes, it has a non-zero acceleration. You’ve also learned that gravity causes a "constant acceleration" of 9.8m/s^2 toward the surface of the earth. How can both of these statements be true for an object that is sitting still on the earth’s surface? In other words, if I am sitting quietly in my easy chair and not moving, am I still accelerationg at 9.8m/s^2 ? Some may be convinced that I am! However, I’m not moving. how can I reconcile these two seemingly disparate statements? Both statements are true, but WHY?

Good Luck – im lost, lol – Thanks agian
still lost, lol. im a softmore in college, this question is directly off my teachers homework assignment.

No, sitting in your chair, you are not moving. You are NOT undergoing any acceleration relative to the earth.

The acceleration of 9.8 m/s² is the acceleration you would undergo IF you were free to move in a downward direction.

Con’t get confused between force of gravity and acceleration due to gravity, they are different but related. Sitting in your chair, you feel the force of gravity, which is equal to your mass x 9.8 m/s². so if you had a mass of 100 kg, you would feel a force, your weight, of 9800 newtons.

I don’t know of anyone who is convinced you are accelerating while in your chair, where did you hear that strange story? Email me if you are still confused.

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Learning Goal: To understand the conditions necessary for static equilibrium.

Look around you, and you see a world at rest. The monitor, desk, and chair—and the building that contains them—are in a state described as static equilibrium. Indeed, it is the fundamental objective of many branches of engineering to maintain this state in spite of the presence of obvious forces imposed by gravity and static loads or the more unpredictable forces from wind and earthquakes.

The condition of static equilibrium is equivalent to the statement that the bodies involved have neither linear nor angular acceleration. Hence static mechanical equilibrium (as opposed to thermal or electrical equilibrium) requires that the forces acting on a body simultaneously satisfy two conditions:

\sum \vec{F} = 0 and \sum \vec{\tau}=0;
that is, both external forces and torques sum to zero. You have the freedom to choose any point as the origin about which to take torques.

Each of these equations is a vector equation, so each represents three independent equations for a total of six. Thus to keep a table static requires not only that it neither slides across the floor nor lifts off from it, but also that it doesn’t tilt about either the x or y axis, nor can it rotate about its vertical axis.

http://session.masteringphysics.com/problemAsset/1007460/27/55544.jpg

Part A

Frequently, attention in an equilibrium situation is confined to a plane. An example would be a ladder leaning against a wall, which is in danger of slipping only in the plane perpendicular to the ground and wall. By orienting a Cartesian coordinate system so that the x and y axes are in this plane, choose which of the following sets of quantities must be zero to maintain static equilibrium in this plane.

/sigmaFx and /sigmaT_z and /sigmaF_y

Part B

As an example, consider the case of a board of length L and negligible mass. Take the x axis to be the horizontal axis along the board and the y axis to be the vertical axis perpendicular to the board. A mass of weight W is strapped to the board a distance x from the left-hand end. This is a static equilibrium problem, and a good first step is to write down the equation for the sum of all the forces in the y direction since the only nonzero forces of \sum \vec{F}=0 that exist are in the y direction.

What is \sum {F}_y? Your equation for the net force in the y direction on the board should contain all the forces acting vertically on the board.
Express your answer in terms of the weight W and the tensions in the two vertical ropes at the left and right ends T_L and T_R. Recall that positive forces point upward.

/sumF_y=0=T_L+T_R-W

The only relevant component of the torques is the z component; however, you must choose your pivot point before writing the equations. This point could be anywhere; in fact, the pivot point does not even have to be at a point on the body. You should choose this point to your advantage. Generally, the best place to locate the pivot point is where some unknown force acts; this will eliminate that force from the resulting torque equation

Part C

What is the equation that results from choosing the pivot point to be the point from which the mass hangs (where W acts)?
Express your answer in terms of the unknown quantities T_L and T_R and the known lengths x and L. Recall that counterclockwise torque is positive.

\sumTw_1z=0=-TL_x+(T_r)(L-x)

Part D

What is the equation that results from choosing the pivot point to be the left end of the plank (where T_L acts)?
Express your answer in terms of T_L, T_R, W, and the dimensions L and x. Not all of these variables may show up in the solution.

/sumTL_1z=0=-W(x)+T_rL

Part E

What is the equation that results from choosing the pivot point to be the right end of the plank (where T_R acts)?
Express your answer in terms of T_L, T_R, W, and the dimensions L and x. Not all of these variables may show up in the solution.

/sumR_1z=0=-T_LL+W(L-x)

_______________________________________________

Now these are the parts I don’t understand…

Part F

Solve for T_R, the tension in the right rope.
Express your answer in terms of W and the dimensions L and x. Not all of these variables may show up in the solution.

T_R=????

Part G

Solve for T_L, the tension in the left rope.
Express your answer in terms of W and the dimensions L and x. Not all of these variables may show up in the solution.

T_L=?

Thanks!!!!!!!!!!!!

F) To find T_R just use the net torque eq. you wrote in part D;

T_RL – Wx = 0

T_R = W(x/L)

G) To find T_L use the net torque eq. you wrote in part E;

-T_LL + W(L-x) = 0

T_L = W[(L-x)/L]

You can check these by substituting in the Sum of Force = 0 eq you wrote in part B;

T_L + T_R – W = W[(L-x)/L] + W(x/L) – W
= W{1 – x/L + x/L -1}
= 0
It is indeed zero so you can have confidence in the solutions for T_R & T_L.