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A fan is running at 898 rpm when the power goes out. It makes 1,311 complete revolutions before it finally stops. What was the angular acceleration? (rad/s)
1 what is the spring stiffness of the entire wire considered as a single macroscopic large scale very stiff spring?2
The ends of a thin bar are maintained at different temperatures. The temperature of the cooler end is 8°C, while the temperature at a point 0.13 m from the cooler end is 23°C and the temperature of the warmer end is 48°C. Assuming that heat flows onl..
A hard-thrown tennis ball is moving horizontally when it bangs into a vertical concrete wall at perpendicular incidence. What are the directions of its velocity and acceleration just before hitting the wall
A car accelerates uniformly from rest and covers a distance of 71 m in 5.6 s. If the diameter of a tire is 42 cm, 1.) Find the angular acceleration of the wheel.
A firecracker explodes in reference frame S at t = 2.0 s . A second firecracker explodes at the same position at t = 5.0s . In reference frame S', What is the position of the two explosions in frame S
How many times more light is gathered by a single Keck telescope, whose mirror is equivalent in area to that of a circle 10 m in diameter, than by the Palomar Hale telescope, whose mirror is 5 m in diameter, in any given interval of time?
Estimate the pressure exerted on a floor by the one pointed chair leg (50 kg on all four legs) of area = 0.08 cm2
How to find out the force of friction
question1a uniform bar is propped against an extremely slick vertical wall. the force of static friction between upper
In a football game, a tackle running at a constant speed of 5 m/s tackles a stationary receiver. What is the speed of the system's center of mass before the collision
In a certain experiment, the pressure of a gas depends on the volume by P=alphaV^3+betaV^2, What is the work done on the gas
The projection lens in a certain slide projector is a single thin lens. A slide 23.9 mm high is to be projected so that its image fills a screen 1.84 m high. Determine the focal length of the projection lens
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