Physics for Scientists and Engineers
10th Edition
ISBN: 9781337553278
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 2, Problem 19P
A glider of length ℓ moves through a stationary photogate on an air track. A photogate (Fig. P2.19) is a device that measures the time interval Δtd during which the glider blocks a beam of infrared light passing across the photogate. The ratio vd = ℓ/Δtd is the average velocity of the glider over this part of its motion. Suppose the glider moves with constant acceleration. (a) Argue for or against the idea that vd is equal to the instantaneous velocity of the glider when it is halfway through the photogate in space. (b) Argue for or against the idea that vd is equal to the instantaneous velocity of the glider when it is halfway through the photogate in time.
Figure P2.19
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A glider on an air track carries a flag of length l through a stationary photogate, which measures the time interval Δtd during which the flag blocks a beam of infrared light passing across the photogate. The ratio vd = l/Δtd is the average velocity of the glider over this part of its motion. Suppose the glider moves with constant acceleration. (a) Is vd necessarily equal to the instantaneous velocity of the glider when it is halfway through the photogate in space? Explain. (b) Is vd equal to the instantaneous velocity of the glider when it is halfway through the photogate in time? Explain.
A glider of length ℓ moves through a stationary photogate on an air track. A photogate (shown) is a device that measures the time interval Dtd during which the glider blocks a beam of infrared light passing across the photogate. The ratio υd = ℓ/Δtd is the average velocity of the glider over this part of its motion. Suppose the glider moves with constant acceleration. (a) Argue for or against the idea that υd is equal to the instantaneous velocity of the glider when it is halfway through the photogate in space. (b) Argue for or against the idea that υd is equal to the instantaneous velocity of the glider when it is halfway through the photogate in time.
A thief is trying to escape from a parking garage after completing a robbery, and the thief’s car is speeding (v = 11 m/s) toward the door of the parking garage (Fig. P2.60). When the thief is L = 14 m from the door a police officer flips a switch to close the garage door. The door starts at a height of 7 m and moves downward at 0.3 m/s. If the thief’s car is 1.4 m tall, will the thief escape? (Find the height of the door above the ground).
Chapter 2 Solutions
Physics for Scientists and Engineers
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