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A supertrain of proper length 97 m travels at a speed of 0.91c as it passes through a tunnel having proper length 50 m. As seen by a trackside observer, is the train ever completely within the tunnel?
A police siren has a frequency of 550 Hz as the police car approaches you and a frequency of 450 Hz after it has passed you and receding, What is the true frequency of the police siren
Valerie is able to do 1200 joules of work in 10seconds. Brett is able to do 5000 joules of work in 50 seconds. Who is more powerful.
A blimp is motoring at constant altitude. The airspeed indicator on the blimp shows that its speed relative to the air is 20km/h, what is the velocity (magnitude and direction) of the blimp relative to the ground
A mass is placed at rest on a ramp inclined at 33 degrees to the horizontal. what is its acceleration down the ramp
A diver pushes off horizontally from the top of a vertical cliff that is 40.0 m high from water surface below. How long is the diver in the air
A model rocket engine has an average thrust of 5.26 N. It has an initial mass of 25.9 g, which includes fuel mass of 13.0 g. The duration of its burn is 1.90 s. find What is the average exhaust speed of the engine
A 8.00 kg bullet traveling at 475 m/s embeds itself in a 1.69 kg wooden block at rest on a frictionless surface. Find the amplitude of the subsequent simple harmonic motion
The average power used by a stereo speaker is 56 W. Assuming that the speaker can be treated as a 7.7- resistance, find the peak value of the ac voltage applied to the speaker
Please help me solve this problem: The electric motor of a model train accelerates the train from rest to 0.600 m/s in 33.0 ms. Find the average power delivered to the train
A curve in a highway has radius of curvature 120 m and is banked at 2.8°. what is the safest speed to go around the curve
A car of 1200 kg mass is traveling uphill at an angle of 20 degrees at a constant speed. What is the magnitude of the normal force on the car
On a clear day the electric ?eld in the atmosphere near the earth's surface is 100 N/C, What is the potential at the top of a man's head if the man is 2 m tall and is standing
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