Two bodies of equal mass m collide and stick together. The quantities that always have equal magnitude for both masses during the collision are
a. their changes in momentum.
b. the force each exerts on the other.
c. their changes in kinetic energy.
d. all of the above.
e. only (a) and (b) above.
[Ques. 2] The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system.
b. inelastic collisions between particles within the system.
c. changes of momentum of individual particles within the system.
d. internal forces acting between particles within the system.
e. external forces acting on particles of the system.
[Ques. 3] If you know the impulse that has acted on a body of mass m you can calculate
a. its initial velocity.
b. its final velocity.
c. its final momentum.
d. the change in its velocity.
e. its acceleration during the impulse.
[Ques. 4] When two bodies of different masses collide, the impulses they exert on each other are
a. equal for all collisions.
b. equal but opposite for all collisions.
c. equal but opposite only for elastic collisions.
d. equal but opposite only for inelastic collisions.
e. equal but opposite only when the bodies have equal but opposite accelerations.
[Ques. 5] A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40 angle to the ground. The magnitude of the vertical impulse the catapult receives from the rock is
a. 5.1 104 N s.
b. 6.1 104 N s.
c. 8.0 104 N s.
d. 5.0 105 N s.
e. 6.0 105 N s.
[Ques. 6] A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40 angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
a. 5.1 104 N s.
b. 6.1 104 N s.
c. 8.0 104 N s.
d. 5.0 105 N s.
e. 6.0 105 N s.
[Ques. 7] A 0.28-kg stone you throw rises 34.3 m in the air. The impulse the stone receives from your hand while being thrown is
a. 2.7 N s, up.
b. 2.7 N s, down.
c. 7.3 N s, up.
d. 7.3 N s, down.
e. 9.6 N s, up.
[Ques. 8] A 0.28-kg stone you throw rises 34.3 m in the air. The impulse your hand receives from the stone while it throws the stone is
a. 2.7 N s, up.
b. 2.7 N s, down.
c. 7.3 N s, up.
d. 7.3 N s, down.
e. 9.6 N s, up.
[Ques. 9] A 0.28-kg stone you throw rises 34.3 m in the air. The magnitude of the impulse the stone received from your hand while being thrown is
a. 0.27 N s.
b. 2.7 N s.
c. 7.3 N s.
d. 9.6 N s.
e. 34.3 N s.
[Ques. 10] A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse the Earth has received from the gravitational force exerted by the stone is
a. 9.80 N s.
b. 19.6 N s.
c. 29.4 N s.
d. 58.8 N s.
e. 118 N s.
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