5. In a 300-m race, runner A starts from rests and accelerates at 1.6m/s? for the first 30 m and then runs at a constant speed. Runner B starts from rests and accelerates at 2.0m/s? for the first 30m and then runs at a constant speed. Runner A begins running as soon as the race begins but B firsts takes a nap to rest up. What is the longest nap that B can take and still not to lose the race?

5. In a 300-m race, runner A starts from rests and accelerates at 1.6m/s? for the first 30 m and then runs at a constant speed. Runner B starts from rests and accelerates at 2.0m/s? for the first 30m and then runs at a constant speed. Runner A begins running as soon as the race begins but B firsts takes a nap to rest up. What is the longest nap that B can take and still not to lose the race?

Name: a) where should he be when you release the egg? Assume that the egg i
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Description: a) where should he be when you release the egg? Assume that the egg is in free fall.b) what will be the velocity of the egg when it hits his head?5. In a 300-m race, runner A starts from rests and accelerates at 1.6m/s? for the first 30 m and thenru

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter3: Motion Along A Straight Line

Section: Chapter Questions

Problem 64P: An express train passes through a station. It enters with an initial velocity of 22.0 m/s and...

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An express train passes through a station. It enters with an initial velocity of 22.0 m/s and decelerates at a rate of 0.150m/s2 as it goes through. The station in 210.0 m long. (a) How fast is it going when the nose leaves the station? (b) How long is the nose of the train in the station? (c) If the train is 130 m long, what is the velocity of the end of the train as it leaves? (d) When does the end of the train leave the station?
A swan on a lake gets airborne by flapping its wings and running on top of the water. (a) If the swan must reach a velocity of 6.00 m/s to take off and it accelerates from rest at an average rate of 0.35m/s2 , how far will it travel before becoming airborne? (b) How long does this take?
A ball starts from rest and accelerates at 0.5 m/s² while moving down on a 9 m long inclined plane. 10) When the ball reaches the bottom of this plane, it continues moving with constant velocity along 12 m long horizontal path. Then, it moves up the second inclined surface for 10s and it stops. a) What is the speed of the ball at the bottom of the first inclined plane? b) How long does it take for the ball to reach the bottom of the second inclined plane? c) What is the acceleration in the second inclined plane? d) What is the speed of the ball at the point 8 m away from the bottom of the second inclined plane? Answers: a) v = 3 m/s, b) t = 10 s, c) a = -0.3 m/s² (parallel to that surface and in the downward direction), d) v =2.05 m/s
A team fires a rocket the at an angle 30° and accelerates at 30 m/s? for 3.0 s. The engine shuts off at a height 202.5 m above the groukd. a) Calculate the speed of the rocket after 3s. b) At what time after t = 0 will the maximum height be reached? c) What maximum height will the rocket reach?
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A girl is standing at the edge of a cliff 100. m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed 8.00 m/s. a) How long does it take the rock to hit the ground? b) What is the speed of the rock the instant before it hits the ground? Please type answer
Butch and Sundance are standing on the edge of a cliff, arguing about whether ornot they should jump into the water below. Butch drops a small rock and is able to count to 7-Mississippi (i.e., 7 seconds) before it hits the water. Assume g=10 m/s2.Ignore air resistance.a) If they were to jump, how fast would they be going just before they hit the water?(in m/s)b) How high is the cliff in meters?c) Transform the velocity in a) to mi/hr and the height in b) to feet. Would you jump?
A car traveling at 20m/s is attempting to drive up an icy hill. When it getsonto the hill, it is able to go 10 meters before it hits some ice and begins sliding. Assume the hillis a 10 degree incline. A. How far up the hill does the car travel before it starts to slide back down? Make sure toinclude the initial 10 meters in your final distance. B. If the car then slides all the way back to the bottom of the hill, what is its speed when itgets to the bottom? Assume it doesn’t gain traction back, so it is sliding with no frictionthe whole way down.
A rocket is launched from Wallops Island: a. The rocket leaves the ground from rest and reaches a height of 1000 meters in 6 seconds. What is the average velocity of the rocket after 6 seconds? b. Again, the rocket leaves the ground from rest and reaches a velocity of 400 m/s after 10 seconds. What is the average acceleration after 10 seconds? c. If after the rocket reaches 1000 meters, the engines fail. Ohhhhh, bad day for the rocket! Describe the motion of the rocket from 1000 meters until the rocket crashes into the ground in terms of a, v, and position:
A ball was dropped from the top of a building. If the ball was from a height of 339 meters from the ground, find the speed of the ball 3 seconds after it was dropped. = 0 m/s y t = 3.00 s Select one: a. 3325.5900 m/s b. 0.0289 m/s c. 348.8100 m/s d. 29.4300 m/s