8. An athlete leaves one end of a pool of length Lat t- Oand arrives at the other end at time t1. She swims backand arrives at the starting position at time t2. If she isswimming initially in the positive x direction, deter-mine her average velocities symbolically in (a) the firsthalf of the swim, (b) the second half of the swim, and(c) the round trip. (d) What is her average speed forthe round trip?

Given that: An athlete leaves one end of pool of length L at t = 0 and arrives at other end at t =…

Answered: 8. An athlete leaves one end of a pool…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter2: Motion In One Dimension

Section2.3: Acceleration

Problem 2.2QQ: True or False? (a) A car must always have an acceleration in the same direction as its velocity. (b)...

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An object moves with constant acceleration 4.00 m/s2 and over a lime interval reaches a final velocity of 12.0 m/s. (a) If its initial velocity is 6.00 m/s, what is its displacement during the time interval? (b) What is the distance it travels during this interval? (c) If its initial velocity is -6.00 m/s, what is its displacement during points, (d) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? (e) Explain physically why it does or does not agree.
An athlete swims the length L of a pool in a time t1 andmakes the return trip to the starting position in a time t2. Ifshe is swimming initially in the positive x - direction, determineher average velocities symbolically in (a) the first halfof the swim, (b) the second half of the swim, and (c) theround trip. (d) What is her average speed for the roundtrip?
A jet plane comes in for a landing with a speed of 100 m/s, and its acceleration can have a maximum magnitude of 5.00 m/s^2 as it comes to rest, from the instant the plane touches the runway, what is the minimum time interval needed before it can come to rest?
A car, moving to the left in a straight line in the negative x-direction, travels a distance d = 32 m during time interval Δt = 18 s. What is the value of the x-component of the car's average velocity, in m/s, during the given time interval?
A simple model for a person running the 100 m dash is to assume the sprinter runs with constant acceleration until reaching top speed, then maintains that speed through the finish line. If a sprinter reaches his top speed of 11.2 m/s in 2.14 s, what will be his total time?
Two particles are currently in motion along parallel, straight paths in the positive x-direction, between two timing gates that are spaced at a distance d from each other. They both pass the first timing gate with a “flying start”, at t0 = 0, and they move as follows: - Particle A is moving with a constant velocity, vA - Particle B passes the first timing gate with a momentary velocity vB0 > 0, and a constant acceleration of aB = const. - After some time t1, both particles meet again at the second timing gate! a) Write the motion path equations x(t) for each particle in algebraic form Solve the following questions numerically for these parameters: d = 600m, t1 = 100s, vB0 = 15m/s b) What is the constant velocity for particle A? c) What is the constant acceleration for particle B? d) At what time does particle B come to a stop? e) What is the velocity for particle B at the second gate at the time t1? f) What is the total distance travelled for particle B? g) What is the average…
A person hits a trampoline while moving downward with a speed of 9 m/s and rebounds a short time later with roughly the same speed upward. If the person is in contact with the trampoline for about 1.8 s, what are the magnitude and direction of the person’s average acceleration during this time interval? (Hint: You can ignore the effects due to gravity
Most important in an investigation of an airplane crash by the U.S. National Transportation Safety Board is the data stored on the airplane’s flight-data recorder, commonly called the “black box” in spite of its orange coloring and reflective tape.The recorder is engineered to withstand a crash with an average deceleration of magnitude 3450 g during a time interval of 6.49 ms. In such a crash, if the recorder and airplane have zero speed at the end of that time interval, what is their speed at the beginning of the interval?
Most important in an investigation of an airplane crash by the U.S. National Transportation Safety Board is the data stored on the airplane’s flight-data recorder, commonly called the “black box” in spite of its orange coloring and reflective tape.The recorder is engineered to withstand a crash with an average deceleration of magnitude 3400g during a time interval of 6.50 ms. In such a crash, if the recorder and airplane have zero speed at the end of that time interval, what is their speed at the beginning of the interval?
Car A is parked along the northbound lane of a highway, and car B is traveling in the southbound lane at a constant speed of 60 mi/h. At t=0, A starts and accelerates at a constant rate a A , while at t= 5 s, B begins to slow down with a constant deceleration of magnitude a A 6. Knowing that when the cars pass each other x = 294 ft and VA = VB , determine (a) the acceleration aA,(b) when the vehicles pass each other, (c) the distance d between the vehicles at t=0.
If a ball is thrown straight up into the air with an initial velocity of 70 ft/s, it height in feet after ? second is given by y=70t−16t^2. Find the average velocity for the time period begining when t=2 and lasting 0.1 seconds = 0.01 seconds= 0.001 seconds= Finally based on the above results, guess what the instantaneous velocity of the ball is when ?=2.
A jet plane comes in for a landing with a speed of 100m/s, and its acceleration can have a maximum magnitude of 5.00m/s2 as it comes to rest from the instant the plane touches the runway, what is the minimum time interval needed before it can come to rest?

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