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A board, with a mass m = 20.0 kg and a length of 4.00 m, is supported by two identical vertical connected to the ends of the board, as shown in the figure. A box with a mass M = 50.0 kg is placed on the board with its center of mass at d = 1.00 m from rope A. What are the tensions in the two ropes?
A typical American house requires an average 20 kW for heating. Explain how many homes could be heated with the waste heat of this one power plant?
A 1940-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 32.2 m/s. At what angle is the hill inclined above the horizontal
A 66 {rm kg} skier speeds down a trail, as shown in the figure . The surface is smooth and inclined at the angle of 22 ^circ with the horizontal. Find the magnitude of the net force acting on the skier.
A very large number (N+1) polaroids are arranged in a sandwich.
It's found that string is set into oscillation only at the frequency 880 Hz and 1320 Hz as the frequency of an oscillator is varied over the range 500-1500 Hz. What is the tension in the string.
Consider a rocket-powered hockey puck, and assume the rocket produces a constant acceleration when the rocket is on. Determine the impact location and the impact speed of the puck
A proton, initially traveling in the +x-direction with a speed of 5.00×105m/s, enters a uniform electric field directed vertically upward, What is the strength of the electric field
How many days does it take for a perfect blackbody cube (0.0206 m on a side, 66.9 °C) to radiate the same amount of energy that a one-hundred-watt light bulb uses in one hour?
Dan is gliding on his skateboard at 2.00m/s. He rapidly jumps backward off the skateboard, kicking the skateboard forward at 8.00m/s (as measured by an observer on the ground). Dan's mass is 60.0kg and the skateboard's mass is 7.00kg.
For the typical volume charge density I? = -1.1 A? 10-3 C/m3, what is the difference in the electric potential between the pipe's center and its inside wall
Assume a constant upward slope of 32; calculate the horizontal and vertical components of the acceleration of a truck that slowed from 140 to rest in 7.3.
The power required by an ice maker is 225 W and is the rate at which it does work. The ice maker operates like a refrigerator or an air conditioner and has a coefficient of performance of 3.60.
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