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Bats emit sounds of frequencies around 35.0 kHz and use echolocation to find their prey. If a bat is moving at the speed of 12.0 m/s toward an insect at an air temperature of 20.0oC, (assume the insect and air are still)
(a) What frequency is heard by the insect?
(b) What frequency is heard by the bat from the reflected sound?
(c) Would the speed of the bat affect the answers?
A Carnot engine with a hot-reservoir temperature of 500 degrees C has a thermal efficiency of 26.3%. What is the cold-reservoir temperature in degrees C
A tuning fork vibrates at concert A, fA = 440. Hz. The A string of a violin is sounded together with this tuning fork, Find the period of the string's vibration
A soccer player kicks a rock horizontally off a 39.0-m-high cliff into a pool of water. If the player hears the sound of the splash 2.97 s later, what was the initial speed given to the rock? Assume the speed of sound in air is 343 m/s.
A child holds a candy bar 10.0 cm in front of a convex mirrorand notices that the image is only one-half the size of the candybar. What is the radius of curvature of the mirror?
What is the radius of the curve?
A 100 g ball attached to a spring with spring constant 2.50N/m oscillates horizontally on a frictionless table. Its velocityis 20.0 cm/s when x = -5.00 cm. What is the amplitude of oscillation?
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The work done by an external force to move a 6.50 uC charge from point a to point b is 0.0240 J. The charge started from rest, Find the potential difference, Vba between points
You find an unlabeled box of fine needles, and want to determine how thick they are. What is the diameter of the needle
Two people with a combined mass of 134 kg hop into an old car with worn-out shock absorbers. This causes the springs to compress by 9.00cm. Find the total load supported by the springs
an object at rest explodes into three pieces of equal mass. one moves east at 20.0 ms while a second moves northwest at
Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. What is the voltage between the plates
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