* While babysitting their younger brother, Chrisso and Devin are playing with toys. They notice that the squishy Piglet slows down in a repeatable way when they push it along the smooth wooden floor. They propose a hypothesis that the toy slows down with a constant acceleration, which does not depend on the toy’s initial veloctiy. Foe each of five different initial speeds, they measure the distance traveled by the toy from the time they stop pushing it to the time the toy stops moving, and they measure the corresponding time interval. Their data are presented below. Do the data support their hypothesis? Explain. If yes, determine the average acceleration of Piglet and the maximum speed with which Chrisso and Devin push Piglet. Experiment # Distance (m) Time(s) 1 0.96 0.65 2 2.84 1.12 3 1.72 0.87 4 2.53 1.05 5 0.62 0.53
* While babysitting their younger brother, Chrisso and Devin are playing with toys. They notice that the squishy Piglet slows down in a repeatable way when they push it along the smooth wooden floor. They propose a hypothesis that the toy slows down with a constant acceleration, which does not depend on the toy’s initial veloctiy. Foe each of five different initial speeds, they measure the distance traveled by the toy from the time they stop pushing it to the time the toy stops moving, and they measure the corresponding time interval. Their data are presented below. Do the data support their hypothesis? Explain. If yes, determine the average acceleration of Piglet and the maximum speed with which Chrisso and Devin push Piglet. Experiment # Distance (m) Time(s) 1 0.96 0.65 2 2.84 1.12 3 1.72 0.87 4 2.53 1.05 5 0.62 0.53
* While babysitting their younger brother, Chrisso and Devin are playing with toys. They notice that the squishy Piglet slows down in a repeatable way when they push it along the smooth wooden floor. They propose a hypothesis that the toy slows down with a constant acceleration, which does not depend on the toy’s initial veloctiy. Foe each of five different initial speeds, they measure the distance traveled by the toy from the time they stop pushing it to the time the toy stops moving, and they measure the corresponding time interval. Their data are presented below. Do the data support their hypothesis? Explain. If yes, determine the average acceleration of Piglet and the maximum speed with which Chrisso and Devin push Piglet.
Captain John Stapp is often referred to as the "fastest man on Earth." In the late 1940s and early 1950s, Stapp ran the U.S. Air Force's Aero Med lab, pioneering
research into the accelerations which humans could tolerate and the types of physiological effects which would result. Manning the rocket sled on the famed Gee
Whiz track, Stapp tested acceleration and deceleration rates in both the forward-sitting and backward-sitting positions. He would accelerate to aircraft speeds along
the 1200-foot track and abruptly decelerate under the influence of a hydraulic braking system. On one of his most intense runs, his sled decelerated from 274 m/s
(614 mi/hr) to a stop at -202 m/s/s. Determine the....
a. ... stopping distance.
Distance
b... stopping time.
Time
S
m
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Info
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A circular racetrack has a distance of 755 m. A racer is currently driving her car on the racetrack. As she starts the car from rest, it begins to accelerate to a speed of 120 kph in 9 s.
a. Determine the magnitude of the total acceleration of the car, 4 s after the car begins to
increase its speed.
b. If she maintains the speed of the car to be 120 kph, determine the magnitude of the total
acceleration of the car after 5s.
c. Upon accelerating to 120 kph, will the car pass its starting point?
Prove using kinematic equations.
Direction: Solve what is required in each of the following problems. Show a step by step process in finding the solution of the problem.
A bike accelerates uniformly from rest to a speed of 8.10 m/s over a distance of 37.4 m. Determine the acceleration of the bike.
A feather is dropped on the moon from a height of 3.40 meters. The acceleration of gravity on the moon is 1.67 m/s2. Determine the time for the feather to fall to the surface of the moon.
A car begins driving from a stationary position. It accelerates at 5 m/s2 for 15 seconds, then travels at a steady speed for another 10 seconds, all in the same direction. How much distance has it covered since it started driving?
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