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Ultrasound used in a particular medical imager has frequency 4.8 MHz and wavelength 0.31mm . Find (a) the angular frequency, (b) the wave number, and (c) the wave speed.
A certain lightbulb has a tungsten filament with a resistance of 17.7 ? when at 20.0°C and 135 ? when hot. Find the temperature of the hot filament
In a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles, What is the magnitude of Betty's force
A 10 kg dog is standing on scale in an accelerating elevator. If the scale reads 5 kg, what is the acceleration of the elevator
A 70 kg object is being pulled up a slope of 35 degrees with the horizontal so that the rope is parallel to the slope. what is the magnitude of the force pulling the block
A small ball is thrown horizontally out of a window 7.50 m above the ground. With what speed was it thrown
A string is clamped at one end and the other end rests on a light, frictionless pulley with a mass hanging below it to provide a tension. What is the mass on the end of the string
A child in danger of drowning in a river is being carried downstream by a current that has a speed of 2.75 km/hr. The child is 0.560 km from shore and 0.750 km upstream of a boat landing when a rescue boat sets out. If the boat proceeds at its maximu..
A movie star catches a reporter shooting pictures of her at home. She claims the reporter was trespassing, and to prove her point, How far away from the subject was the camera sensor
A tow truck pulls a car 5.2 km along a horizontal roadway using a cable having a tension of 790.
An artillery shell is fired with an initial velocity of 300 m/s at 47.5° above the horizontal. To clear an avalanche, it explodes on a mountainside 47 s after firing. What is the x and y components of the shell where it explodes, relative to its f..
An iron tower in is 399 meters tall on a cold day (T = -6.7 degrees Celsius). What is its height of the tower on a hot day while the temperature is 31.5 degrees Celsius.
A 41 kg ice skater is moving at 4.73 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. Find the force exerted by the rope on her arms
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