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The pitch of the sound from a race car engine drops the musical interval of a FIFTH when it passes the spectators. This means the frequency of the sound after passing is 0.8 times what it was before. How fast is the race car moving?
m/s
An experimental bicycle wheel is placed on a test stand so that it is free to turn on its axle. If a constant net torque of 6.00 N · m is applied to the tire for 5.00 s, the angular speed of the tire increases from 0 to 100 rev/min. The external t..
An electron is observed traveling at a speed of 2.38 107 m/s parallel to an electric field of magnitude 11,460 N/C. How far will the electron travel before coming to a stop
An unknown tuning fork produces a beat frequency of 3Hz when played with a 440Hz fork, What is the frequency of the unknown fork
Two 480 V (rms) loads are connected in parallel. The two loads draw a total average power of 40,800 W at a power factor of 0.8 lagging. What is the power factor of the other load
A child loses his balloon, which rises slowly into the sky. If the balloon is 23 cm in diameter as the child loses it, what is its diameter at the following altitudes? Assume that the balloon is very flexible and so surface tension could be neglec..
A golf ball with mass m = 0.07 kg is tied to a massless string of length L = 0.6 m. What the magnitude of the tension in the string
A light bulb is placed 22.2 cm in front of a concave mirror. Calculate the focal length of the concave mirror
The net work done in accelerating a propeller from rest to an angular speed of 135 rad/s is 1998.5 J. What is the moment of inertia of the propeller
Why is it better for some purposes to use a medium size telescope on a mountain instead of a telescope in space?
Bob connects a lamp of 34 Ohms resistance across a car battery of 12 volts. what would be the power dissipated by the lamp
You close the top of your straw with your thumb and lift the straw out of your glass containing Coke. How large is the error (in per cent) if you neglect the air in the straw
Atomic physicists usually ignore the effect of gravity within an atom. To see why, we may calculate and compare the magnitude of the ratio of the electrical force, What is the magnitude of the electrical force
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