2. Pictures below depict four situations where people are walking or climbing up a ladder on a train. The directions and speeds of the train relative to the ground and the person relative to the train are as given in each figure. An observer standing on the ground is observing the motion of the person. Rack these situations, from least to greatest, on the basis of the speed of the person relative to an observer on the ground. 3m/s 3m/s 24m/s 24m/s (A) (B) 5m/s 3m/s 20m/s 24m/s (C)

2. Pictures below depict four situations where people are walking or climbing up a ladder on a train. The directions and speeds of the train relative to the ground and the person relative to the train are as given in each figure. An observer standing on the ground is observing the motion of the person. Rack these situations, from least to greatest, on the basis of the speed of the person relative to an observer on the ground. 3m/s 3m/s 24m/s 24m/s (A) (B) 5m/s 3m/s 20m/s 24m/s (C)

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Description: 2. Pictures below depict four situations where people are walking orclimbing up a ladder onrelative to the ground and the person relative to the train are as givenin each figure. An observer standing on the ground is observing themotion of the perso

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter3: Two-dimensional Kinematics

Section: Chapter Questions

Problem 53PE: A seagull flies at a velocity of 9.00 m/s straight into the wind. (a) If it takes the bird 20.0 min...

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One strategy in a snowball fight is to throw a snowball at a high angle over level ground. Then, while your opponent is watching that snowball, you throw a second one at a low angle timed to arrive before or at the same time as the first one. Assume both snowballs are thrown with a speed of 25.0 m/s. The first is thrown at an angle of 70.0 with respect to the horizontal. (a) At what angle should the second snowball be thrown to arrive at the same point as the first? (b) How many seconds later should the second snowball be thrown after the first for both to arrive at the same time?
One strategy in a snowball fight is to throw a snowball at a high angle over level ground. Then, while your opponent is watching that snowball, you throw a second one at a low angle timed to arrive before or at the same time as the first one. Assume both snowballs are thrown with a speed of 25.0 m/s. The first is thrown at an angle of 70.0 with respect to the horizontal. (a) At what angle should the second snowball be thrown to arrive at the same point as the first? (b) How many seconds later should the second snowball be thrown after the first for both to arrive at the same time?
A helicopter blade spins at exactly 100 revolutions per minute. Its tip is 5.00 m from the center of rotation. (a) Calculate the average speed of the blade tip in the helicopter's frame of reference. (b) What is its average velocity over one revolution?
Unreasonable Results Suppose you wish to shoot supplies straight up to astronauts in an orbit 36,000 km above the surface of the Earth. (a) At what velocity must the supplies be launched? (b) What is unreasonable about this velocity? (c) Is there a problem with the relative velocity between the supplies and the astronauts when the supplies reach their maximum height? (d) Is the premise unreasonable or is the available equation inapplicable? Explain your answer.
When you are flying in a commercial jet, it may appear to you that the airplane is stationary and the Earth is moving beneath you. Is this point of view valid? Discuss briefly
You have a great job working at a major league baseball stadium for the summer! At this stadium, the speed of every pitch is measured using a radar gun aimed at the pitcher by an operator behind home plate. The operator has so much experience with this job that he has perfected a technique by which he can make each measurement at the exact instant at which the ball leaves the pitchers hand. Your supervisor asks you to construct an algorithm that will provide the speed of the ball as it crosses home plate, 18.3 m from the pitcher, based on the measured speed vi of the ball as it leaves the pitchers hand. The speed at home plate will be lower due to the resistive force of the air on the baseball. The vertical motion of the ball is small, so, to a good approximation, we can consider only the horizontal motion of the ball. You begin to develop your algorithm by applying the particle under a net force to the baseball in the horizontal direction. A pitch is measured to have a speed of 40.2 m/s as it leaves the pitchers hand. You need to tell your supervisor how fast it was traveling as it crossed home plate. (Hint: Use the chain rule to express acceleration in terms of a derivative with respect to x, and then solve a differential equation for v to find an expression for the speed of the baseball as a function of its position. The function will involve an exponential. Also make use of Table 6.1.)
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1-Imagine that during a storm, raindrops are falling straight down with speed u, measured relative to the ground. Let’s say you are driving east in your car with speed v (relative to the ground). From your perspective, at what angle from the vertical are the raindrops moving? Give your answer symbolically in terms of the variables u and v. note: Drawing necessary for this question