Questions Uploads
Question
A baseball fan sitting in the “cheap seats” is d = 156 m
from home plate (see the figure below). How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan hears the sound? (Assume the speed of sound is 344 m/s, and the vertical distance can be ignored.)
Question
In a student laboratory exercise, the wavelength of a 44,300 Hz ultrasound wave is measured to be 0.795 cm. Find the air temperature (in K).
Question
An electric clothes dryer is rated at 4,500 W. How much energy does it use in 25 min?
Question
The resistance of an electric heater is 35 Ω
when connected to 120 V. How much energy does it use during 35 min
of operation?
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