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Many 2.5-in-diameter (6.35 cm) disks spin at a constant 7200 rpm operating speed. The disks have a mass of about 7.5 g and are essentially uniform throughout with a very small hole at the center. If they reach their operating speed 2 s after being turned on, what average torque does the disk drive supply to the disk during the acceleration?
The power supplied to a typical black and white television set is 82 Watt when the set is connected to 120 Volt. Find how much electrical energy does this set consume in one hour
The voltage across a membrane forming a cell wall is 74.0 mV and the membrane is 8.80 nm thick. What is the electric field strength
Two balls undergo a perfectly elastic head-on collision, with one ball initially at rest. If incoming ball has a speed of 200 m/s. What is the final speed of the incoming ball if it is much more massive than stationary ball.
Dana has a 0.75-kg sports medal suspended by a long ribbon from her rearview mirror. What is the tension in the medal's ribbon
A thin soap film (n = 1.35) is suspended in air. The spectrum of light reflected from the film is missing two visible wavelengths of 490.8 nm and 589.0 nm, What is the thickness of the soap film
The period of a pendulum is 0.215 s on Earth. The period of the same pendulum is found to be 0.467 s on planet X, whose mass is equal to that of Earth.
Two objects with masses of 4.00 kg and 5.00 kg are connected by a light string thatpasses over a frictionless pulley. Determine the tension in the string. Determine the acceleration of each object.
Calculate the speed of an electron that is accelerated through the same potential difference
Approximately which fringe number has a peak intesnity that is 1/2 percent of the central fringe intensity
Two cars of equal mass collide on a horizontal frictionless surface. What is the speed of the composite body (A+B) after the collision
A 25 kilogram kid on a play ground swing moves with a speed of 4.5 m/s when the 3.0 meter long swing is at its lowest point. Find the angle that the swing makes with the vertical when the kid is at the highest point
A speaker and two microphones are arranged inside a sealed container filled with neon gas. What is the speed of sound in neon gas
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