3) Imagine that you and a friend are sitting in two rolling chairs. Your friend pushes off your c...
3) Imagine that you and a friend are sitting in two rolling chairs. Your friend pushes off your chair with a force of approximately 170 N. Your friend weighs approximately 25% more than you. Estimate the velocities of you and your friend and how far you will roll after you push off.
\a) Construct a pictorial representation of the process including coordinate axes and appropriate variables. List known information and identify the unknown(s).
b) Is momentum conserved? How do you know? Do you have to make any assumptions to claim so?
c) Is kinetic energy conserved?
d) Be certain to explain your logic.
Questions to ponder:
i) Do you exert a force on your friend when they push off you?
ii) Will both of you move after the push off? Why?
iii) Will you both have kinetic energy after the push off? momentum?
Homework Answers
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3) Imagine that you and a friend are sitting in two rolling chairs. Your friend pushes off your c...
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in one dimension Mech COnscretion of moment HW-62 3. Two astronauts A and B. narticipate in three collision experiments in a weightless, friction environment. In each experiment, astronaut B is initially at rest, and astronaut A has an initial momentum of 20 kg-m/s to the right. (The velocities of the astronauts are measured with me to a nearby space station.) After Before Experiments 1, 2, and 3 At rest 13. J = 20 kg-m's At rest The astronauts push on...
in one dimension Mech COnscretion of moment HW-62 3. Two astronauts A and B. narticipate in...
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ms H: 10 42 11 Two equal and opposite forces of 3 N have a netforce...
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part c=d How much force must you and your friend each apply to the free end...
part c=d
How much force must you and your friend each apply to the free
end of the door on the same side and perpendicular to the plane of
the door in order to produce the same torque as that produced by
both of you in part (a) above?
N
(d) What is the angular acceleration of the door?
rad/s2
A heavy swing door has a mass of m = 7,500 kg, a width W = 1.9 m, and a...
Problem 6. v- (for both) A small block with mass m is sitting on a large...
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You have an internship working for the National Park Service. They start you off in the laborator...
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C. Now calculate your velocity and kinetic energy just before you hit the wall. (5pts) (if...
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Multiple Choice. Select the best option. You do not need to show your work. S Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel can push for 5.0 min onger. Compare the work they do. A) Both men do positive work, but Joel does 75% more work than Jerry. B) Both men do positive work, but Joel does 50% more work than Jerry C) Both men do positive work, but Jerry does 50%...
in one dimension Mech COnscretion of moment HW-62 3. Two astronauts A and B. narticipate in three collision experiments in a weightless, friction environment. In each experiment, astronaut B is initially at rest, and astronaut A has an initial momentum of 20 kg-m/s to the right. (The velocities of the astronauts are measured with me to a nearby space station.) After Before Experiments 1, 2, and 3 At rest 13. J = 20 kg-m's At rest The astronauts push on...
in one dimension Mech COnscretion of moment HW-62 3. Two astronauts A and B. narticipate in three collision experiments in a weightless, friction environment. In each experiment, astronaut B is initially at rest, and astronaut A has an initial momentum of 20 kg-m/s to the right. (The velocities of the astronauts are measured with me to a nearby space station.) After Before Experiments 1, 2, and 3 At rest 13. J = 20 kg-m's At rest The astronauts push on...
ms H: 10 42 11 Two equal and opposite forces of 3 N have a netforce of A9N B6N c3N DON Which of the following is NOT a constant for an object in uniform circular motion! A distance with time speed e velocity D acceleration magnitude Work is A energy times distance, B force times distance. c force times time. D momentum times distance. You push against Plymouth Rock with a force of 100 newtons for 20.0 seconds. If the...
Problem 1 Two identical pucks, each of inertia m, are connected to a rod of length 2r and negligible inertia that is pivoted about its center (that is, there is some sort of pin though its center, around which it can rotate without friction). A third puck of inertia m/2 strikes one of the connected pucks perpendicular to the rod with a speed vi. Assume the collision is elastic. (a) Draw a diagram of the situation, clearly labeling the direction...
Angling for a New Idea Conservation of L A) I Spin while holding two dumbbells close to your body with your arms folded, spin around on the ro- tating chair (be sure your feet are not touching the chair or ground). Next quickly push the dumbbells straight out to arm's length When you moved the dumbbells away from your trunk, was there a net torque applied to the system (you + rotating chair + dumbbells)? Explain whether or not and...
part c=d
How much force must you and your friend each apply to the free
end of the door on the same side and perpendicular to the plane of
the door in order to produce the same torque as that produced by
both of you in part (a) above?
N
(d) What is the angular acceleration of the door?
rad/s2
A heavy swing door has a mass of m = 7,500 kg, a width W = 1.9 m, and a...
Problem 6. v- (for both) A small block with mass m is sitting on a large block of mass M that is sloped so that the small block can slide down the larger block. There is no friction between the two blocks, no friction between the large block and the table, and no drag force. The center of mass of the small block is located a height H above where it would be if it were sitting on the table...
You have an internship working for the National Park Service. They start you off in the laboratory which tests possible new equipment. Your first job is to test a small cannon used to prevent avalanches in populated areas by shooting down the velocity of the projectile as it leaves the cannon (muzzle speed) so that the range and trajectory of the cannon can be determined. heavy snow concentrations. You want to find out Lab, Initial Lab, Final The cannon you...
C. Now calculate your velocity and kinetic energy just before you hit the wall. (5pts) (if you couldn't do the previous problem, say that the momentum of you + the wall was 210 kg*m/s) d. A bit later in the evening, you go back for a second try... Running forward at a velocity of 9.00m/s, you don't notice that someone has removed the padding from the wall! Luckily, you are wearing a helmet, and you collide head-first with the wall,...
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