Answered: Figure P2.19 Problems 19 and 21. ©…

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Advanced Physics

Figure P2.19 Problems 19 and 21. © Cengage

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Question

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 υ_d = ℓ/Δt_d 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 υ_d 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 υ_d is equal to the instantaneous velocity of the glider when it is halfway through the photogate in time.

Figure P2.19 Problems 19 and 21.
© Cengage

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