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A solid disk rotates in the horizontal plane at an angular velocity of 0.0693 rad/s with respect to an axis perpendicular to the disk at its center. The moment of inertia of the disk is 0.189 kg·m2. From above, sand is dropped straight down onto this rotating disk, so that a thin uniform ring of sand is formed at a distance of 0.391 m from the axis. The sand in the ring has a mass of 0.495 kg. After all the sand is in place, what is the angular velocity of the disk?
When serving a tennis ball, the player hits it when its velocity is zero (at the highest point of a vertical toss). find the mass of the ball
A low-power laser used in a physics lab might have a power of 0.40 mW and a beam diameter of 2.6 mm. Calculate the average light intensity of the laser beam
A 46g marble moving at 2.3m/s strikes a 24g marble at rest. What is the speed of the first marble immediately after the collision
If the rms speed of the molecules of a quantity of helium at temperature 142 K is the same as the rms speed of neon atoms at a second temperature
A point charge Q is located at the center of a very thin, spherical metal shell. what is the electric potential of the shell
The outside mirror on the passenger side of a car is convex and has a focal length of -5.4 m. Find the image distance of the truck
A boy of mass 35 kg and a girl of mass 40 kg are skating towards each other with speeds of 2.5 m/s, and 2.0 m/s respectively. Assume that there is no friction, and find their combined velocity after they meet
A certain amount of work is required to stretch spring A a certain distance. Compare the spring constants of the two springs
Logan is given an initial speed of 4.00 m/s down a 20 %u030A incline. when he reaches the bottom of the incline
In a ballistics test, a 23-g bullet travelling horizontally at 1300 m/s goes through a 40.0 cm-thick 450-kg stationary target and emerges with a speed of 900m/s. The target is free to slide on a smooth horizontal surface.
Near the surface of the Earth a block of mass M is sliding down an incline with angle µ1 = 30degrees. what maximum height H will the block reach
What is the magnetic field amplitude of an electromagnetic wave whose electric field amplitude is 15V/m
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