- #1
PhysicsNovice
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I need more help please. I am moving along slowly in my physics quest to understand. The readings are more difficult and my understanding comes in and out. Please review, see how I did (answers marked with *) and make comments to help me learn. Thanks.
1. Which of the following has the largest momentum?
a. a tightrope walker crossing Niagara Falls
b. a pickup truck speeding along a highway*
c. a Mack truck parked in a parking lot
d. the Science building on campus
e. a dog running down the street
2. Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a greater:
a. speed
b. acceleration
c. momentum*
d. all of these
e. none of these
3. A bullet is fired from a gun. The speed of the bullet will be the same as the speed of the recoiling gun because:
a. momentum is conserved
b. velocity is conserved
c. both velocity and momentum are conserved*
d. the mass of the bullet equals the mass of the gun
e. none of these
4. Two billiard balls having the same mass roll toward each other, each moving at the same speed. What is the combined momentum of the two balls?
a. 0 kg m/s*
b. 10 kg m/s
c. More information need to determine
5. A 5-kg fish swimming at a velocity of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is:
a. 1/2 m/s
b. 2/5 m/s*
c. 5/6 m/s
d. 6/5 m/s
e. 1 m/s
6. According to the impulse-momentum equation, Ft=change in (mv), a person will suffer less injury falling on a wooden floor (which gives) than on a more rigid cement floor. The F in the above equation stands for the force exerted on the:
a. person*
b. floor
c. both of these
d. none of these
7. A 1-kg chunk of putty moving at 1 m/s collides and sticks to a 5-kg bowling ball that is initially at rest. The bowling ball and putty then move with a momentum of:
a. 0 kg m/s
b. 1 kg m/s
c. 2 kg m/s*
d. 5 kg m/s
e. more than 5 kg m/s
8. A karate expert executes a swift blow and severs a cement block with her bare hand. The magnitude is the same for the:
a. impulse on both the block and the expert’s hand
b. force on both the block and the expert’s hand*
c. time of impact on both the block and the expert’s hand
d. all of these
e. none of these
9. The force that accelerates a rocket in outer space is exerted on the rocket by the:
a. rocket’s engine
b. rocket’s wings
c. atmospheric pressure
d. exhaust gases*
e. none of these
10. Compared to the force that brings a small car to a stop, the force required to bring a heavy truck traveling at the same speed to a stop:
a. is less
b. is more*
c. is the same
d. may be less and may be more
1. Which of the following has the largest momentum?
a. a tightrope walker crossing Niagara Falls
b. a pickup truck speeding along a highway*
c. a Mack truck parked in a parking lot
d. the Science building on campus
e. a dog running down the street
2. Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a greater:
a. speed
b. acceleration
c. momentum*
d. all of these
e. none of these
3. A bullet is fired from a gun. The speed of the bullet will be the same as the speed of the recoiling gun because:
a. momentum is conserved
b. velocity is conserved
c. both velocity and momentum are conserved*
d. the mass of the bullet equals the mass of the gun
e. none of these
4. Two billiard balls having the same mass roll toward each other, each moving at the same speed. What is the combined momentum of the two balls?
a. 0 kg m/s*
b. 10 kg m/s
c. More information need to determine
5. A 5-kg fish swimming at a velocity of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is:
a. 1/2 m/s
b. 2/5 m/s*
c. 5/6 m/s
d. 6/5 m/s
e. 1 m/s
6. According to the impulse-momentum equation, Ft=change in (mv), a person will suffer less injury falling on a wooden floor (which gives) than on a more rigid cement floor. The F in the above equation stands for the force exerted on the:
a. person*
b. floor
c. both of these
d. none of these
7. A 1-kg chunk of putty moving at 1 m/s collides and sticks to a 5-kg bowling ball that is initially at rest. The bowling ball and putty then move with a momentum of:
a. 0 kg m/s
b. 1 kg m/s
c. 2 kg m/s*
d. 5 kg m/s
e. more than 5 kg m/s
8. A karate expert executes a swift blow and severs a cement block with her bare hand. The magnitude is the same for the:
a. impulse on both the block and the expert’s hand
b. force on both the block and the expert’s hand*
c. time of impact on both the block and the expert’s hand
d. all of these
e. none of these
9. The force that accelerates a rocket in outer space is exerted on the rocket by the:
a. rocket’s engine
b. rocket’s wings
c. atmospheric pressure
d. exhaust gases*
e. none of these
10. Compared to the force that brings a small car to a stop, the force required to bring a heavy truck traveling at the same speed to a stop:
a. is less
b. is more*
c. is the same
d. may be less and may be more