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A 60 centimeter long, 500 gram bar rotates in a horizontal plane on an axle that passes through the center of the bar. Compressed air is fed in through the axle, passes through a small hole down the length of the bar, and escapes as air jets from holes at the ends of the bar. The jets are perpendicular to the bars axis. Starting from rest, the bar spins up to an angular velocity of 150 rpm at the end of 10s.
a) Find how much force does each jet of escaping air exert on the bar?
b) If the axle is moved to one end of the bar while the air jets are unchanged, find what will be the bar angular velocity at the end of 10s?
The figure below shows an overhead view of a corridor with aplane mirror M mounted at one end. A burglar Bsneaks along the corridor directly toward the center of the mirror. In terms of d, how far from the mirror will she be when the security guard S..
At a county fair there is a betting game that involves aspinning wheel. As the drawing shows, the wheel is set intorotational motion with the beginning of the angular section labeled"1" at the marker at the top of the wheel.
A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.98kg of water at 26.0 oC to 1.98kg of ice at -5.00 oC in 1 hour. How much electrical energy is consumed by the freezer during this hour
A 1.50g penny with density 7170kg/m3 is released just below the surface of a pool of water. What's its initial downward acceleration
Suppose you wish to lean a 3.00 m ladder against a smooth, vertical wall. The ladder's center of gravity is 2/3 of length from the top. If the coefficient of static friction between the ladder and the floor is 0.60, what is the largest angle ladde..
A 10 kg runaway grocery cart runs into a spring with spring constant 240N/m and compresses it by 65cm. What was the speed of the cart just before it hit the spring.
Estimate the rms electric field in the sunlight that hitsMars, knowing that the Earth receives about 1350 W/m2 and that Mars is 1.52 times farther from the Sun (on average) th anis the Earth.
Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other. What sort of interference does the person sense.
The figure below shows a thin-lens representation of a compound microscope (not to scale). The objective produces a real image I of object O just inside the focal point F1 of the eyepiece. Image I then acts as an object for the eyepiece, which pro..
A chair of mass 13.0kg is sitting on the horizontal floor; the floor is not frictionless, Use Newton's laws to calculate the normal force that the floor exerts on the chair
An electron and a proton are each accelerated through a potential dierence of 10.0 MV. Are the particles moving at relativistic speeds
A mechanic pushes a 2.80 103-kg car from rest to a speed of v, doing 4,650 J of work in the process. During this time, the car moves 26.0 m. calculate the horizontal force exerted on the car
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