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A moving beltway at an airport has a speed υ1 and a length L. A woman stands on the beltway as it moves from one end to the other, while a man in a hurry to reach his flight walks on the beltway with a speed of υ2 relative to the moving beltway. (a) What time interval is required for the woman to travel the distance L? (b) What time interval is required for the man to travel this distance? (c) A second beltway is located next to the first one. It is identical to the first one but moves in the opposite direction at speed υ1. Just as the man steps onto the beginning of the beltway and begins to walk at speed relative to his beltway, a child steps on the other end of the adjacent beltway. The child stands at rest relative to this second beltway. How long after stepping on the beltway does the man pass the child?
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Chapter 4 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
- OK, this is the last time for one of these crazy adventures. THIS time, though, there is a window in the floor, and you can see that you re in a rocket which has just taken off from the surface of an alien planet. By taking careful measurements out that window you determine that the rocket is accelerating upward at 6.64 m/s^2. When drop a ball from a height of 1.57 m, it hits the floor 0.236 s later. What is the value ofg for the alien world below you you? 1 58.0 m/s^2 94.4 m/s^2 3 49.7 m/s^2 4 66.2 m/s^2 2.arrow_forwardIn the future, Alice gets on a super high speed space shuttle on Earth to visit her friend Bob on Mars. The distance between the two planets is reported to be 7 × 107 km at the time of her journey. The shuttle moves at a constant speed throughout the journey and the shuttle company advertises that it moves so fast that Y = 1.4. Ignore the effects of acceleration and the movement of the planets for this question. (a) What is the speed of the shuttle, in terms of c? (b) What is the distance of the journey, according to Alice? (c) What is the duration of the journey, according to Alice? (d) What is the duration of the journey, according to Bob? (e) While Alice is on her way, another shuttle that is traveling in the opposite direction back to Earth goes past her. Assuming the other shuttle moves at the same speed as the shuttle Alice is on relative to the planets, what speed does Alice measure for the Earth-bound shuttle?arrow_forwardHello, I had a physics question. "Just as the traffic light changes to green, a Mustang drives through the intersection at a constant velocity of 14.2 m/s [N]. A Camaro that was stopped at the light accelerates from rest at 2.9 m/s^2 [N]. How much time passes before the two cars meet again? How far have they travelled? I figured out how to do the question but I'm really confused on the units of the distance. I used the d = v/t formula and the vit + 1/2at^2 formula but the units I ended up getting were m^2/s^3 for distance when it should just be m.arrow_forward
- While riding on an elevator descending with a constant speed of 2.6 m/s, you accidentally drop a book from under your arm.A)How long does it take for the book to reach the elevator floor, 1.1 m below your arm? (Already answered it's 0.47s)B)What is the book's speed relative to you when it hits the elevator floor?arrow_forwardA person is at a certain level below the 4th floor of an elevator. The elevator can have an acceleration of 7.2 in/s^2 and a deceleration of 3.6 in /s^2 and can reach a maximum speed of 96 in/s^2. Determine the shortest time to take from rest and ending at rest if the elevator is 12 feet/ floor and the person set to reach the 4th floor in secondsarrow_forwardAn ultrasound doppler meter is used to detect motion for an alarm system. The unit emits an ultrasound signal and its echo is detected back at the same unit. If the unit emits a frequency of 100 MHz and is only able to detect a change in frequency of the reflected sound greater than 8.0 kHz, what is the maximum speed that an intruder can travel at relative to the unit whilst remaining undetected? Take the speed of sound in air to be 343 m/s. 6.0 cm/s 2.0 cm/s 1.4 cm/s 2.7 cm/s 12 cm/s 1.0 cm/s 24 O A stv MacBook Airarrow_forward
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- The position of a particle in space at time tis: r(t) = (sec(t)) * i + (tan t) * j + 4/3 tk. Write the particle's velocity at time t = (pi / 6) as the product of its speed and direction.arrow_forwardA magnetic field forces an electron to move in a circle with radial acceleration 3.0 * 1014 m/s2. (a) What is the speed of the electron if the radius of its circular path is 15 cm? (b)What is the period of the motion?arrow_forwardA javelin thrower standing at rest holds the center of the javelin behind her head, then accelerates it through a distance of 70 cm as she throws. She releases the javelin 2.0 m above the ground traveling at an angle of 30 ∘ above the horizontal. Top-rated javelin throwers do throw at about a 30 ∘ angle, not the 45 ∘ you might have expected, because the biomechanics of the arm allow them to throw the javelin much faster at 30 ∘ than they would be able to at 45 ∘ . In this throw, the javelin hits the ground 72 m away. What was the acceleration of the javelin during the throw? Assume that it has a constant acceleration. Express your answer to two significant figures and include the appropriate units.arrow_forward
- Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-Hill