1. A runaway train car that has a mass of 11000 kg travels at a speed of 3.0 m/s down a track. Compute the time required for a force of 1400 N to bring the car to rest. Enter to 2 significant figures At= S
1. A runaway train car that has a mass of 11000 kg travels at a speed of 3.0 m/s down a track. Compute the time required for a force of 1400 N to bring the car to rest. Enter to 2 significant figures At= S
Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter6: Motion In Two Dimensions
Section6.3: Relative Velocity
Problem 27PP
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![1. A runaway train car that has a mass of 11000 kg travels at a speed of 3.0 m/s down a track. Compute
the time required for a force of 1400 N to bring the car to rest.
Enter to 2 significant figures
At=
S](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8512e4d2-f559-44cb-9fee-36fee0c29e9a%2F147126a9-56c4-43e4-b197-44da06edb3f7%2Fd8ngox_processed.png&w=3840&q=75)
Transcribed Image Text:1. A runaway train car that has a mass of 11000 kg travels at a speed of 3.0 m/s down a track. Compute
the time required for a force of 1400 N to bring the car to rest.
Enter to 2 significant figures
At=
S
![1. A professional boxer hits his opponent with a 900 -N horizontal blow that lasts for 0.193 s.
(a) Calculate the impulse imparted by this blow.
Enter to 3 significant figures
Ap=
✔kg-m/s
(b) What is the opponent's final velocity, if his mass is 83.0 kg and he is motionless in midair when
struck near his center of mass?
Enter to 3 significant figures
m/s
Vf=
(c) Calculate the recoil velocity of the opponent's 10.0 -kg head if hit in this manner, assuming the
head does not initially transfer significant momentum to the boxer's body.
Enter to 3 significant figures
V₁ =
m/s
(d) From parts (b) and (c), is it more effective to hit the boxer in the head or torso?
The boxer's
recoils much faster than the
since their
✓is smaller.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8512e4d2-f559-44cb-9fee-36fee0c29e9a%2F147126a9-56c4-43e4-b197-44da06edb3f7%2Fhe63ti_processed.png&w=3840&q=75)
Transcribed Image Text:1. A professional boxer hits his opponent with a 900 -N horizontal blow that lasts for 0.193 s.
(a) Calculate the impulse imparted by this blow.
Enter to 3 significant figures
Ap=
✔kg-m/s
(b) What is the opponent's final velocity, if his mass is 83.0 kg and he is motionless in midair when
struck near his center of mass?
Enter to 3 significant figures
m/s
Vf=
(c) Calculate the recoil velocity of the opponent's 10.0 -kg head if hit in this manner, assuming the
head does not initially transfer significant momentum to the boxer's body.
Enter to 3 significant figures
V₁ =
m/s
(d) From parts (b) and (c), is it more effective to hit the boxer in the head or torso?
The boxer's
recoils much faster than the
since their
✓is smaller.
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