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A 15kg crate, initially at rest, slides down a ramp 2m long and inclined at an angle of 20 degrees with the horizontal. If there is no friction between the ramp surface and crate, what is the velocity of the crate at the bottom of the ramp?
An ac power generator produces 50 A (rms) at 3600 V. The voltage is stepped up to 100 000 V by an ideal transformer and the energy is transmitted through a long distance power line which has a resistance of 100 ohms. What percentage of the power deli..
A uniformly charged sphere has a potential on its surface of 450 V. What is the radius of the sphere
An unknown nucleus has twice the volume of a nucleus with 51 nucleons. What is the atomic mass number of the unknown nucleus
A boat leaves San Pedro and travels 35 km 27o west of south before its engine dies. How far (in km) from and in what direction is the first boat
A child whose weight is 262 N slides down a 4.80 m playground slide that makes an angle of 49° with the horizontal. The coefficient of kinetic friction between slide and child is 0.09.
An aircraft, diving at an angle of 53with the vertical, releases a package at an altitude of 730 m. What is the speed of the aircraft
What is the rotational kinetic energy of the Earth? Use the moment of inertia you calculated in Part A rather than the actual moment of inertia given in Part B.
A juggler throws a ball from height of 0.950 m with a vertical velocity of +3.75 m/s and misses it on the way down. What is its velocity when it hits the ground
A 54.0kg skateboarder wants to just make it to the upper edge of a "quarter pipe," a track that is one-quarter of a circle with a radius of 3.90m
A rocket launched from the ground, rises vertically by acceleration of 30m/s^2 for 1.0s when it runs out of fuel. Disregarding air resistance, how high will the rocket rise?
At the end of an amusement park ride, you want the gondola to stop without the acceleration exceeding 2 g's. what is the maximum allowed braking force
A duck is floating on a lake with 28% of its volume beneath the water. What is the average density of the duck
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