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A car is coasting along at 20 m/s on a road along the top of a hill that is 100 meters high. The road goes down the hill. If the car coasts to the bottom of the hill and there is no friction, how fast is it going when it reaches the bottom?
A 54 N crate is suspended from the left end of a plank. The plank weighs 21N, but it is not uniform, so its center of gravity does not lie halfway between the two ends. The system is balanced by a support that is 0.3m from the left end of the plan..
Two very small spheres are initially neutral and separated by a distance of 0.55 m. find Is the force attractive or repulsive
The Zacchini family was renowned for their humancannonball act in which a family member was shot from a cannon using either elastic bands or compressed air. what was the magnitude of the force propelling him
A charged particle is injected at 215 m/s into a 0.0739-T uniform magnetic magnetic field perpendicularly to the field. What is the charge-to-mass ratio of this particle
at rest, a light source emits 532 nm light. as it moves along a line connecting it and Earth, observers on Earth measure the wavelength to be 412 nm. What is the sources velocity and direction? Were it to move in opposite direction at the same spe..
A layer of oil (n = 1.45) floats on an unknown liquid. A ray of light originates in the oil and passes into the unknown liquid. What is the index of refraction of the unknown liquid
A skateboarder shoots off a ramp with a velocity of 6.4 m/s, directed at an angle of 55° above horizontal.
At time t= 0, a 2150-kg spacecraft in outer space fires an engine that exerts anincreasing force on it in the +x-direction. What impulse does the engine exert on the spacecraft during the 1.5 s interval starting 2.0 s afte..
A speed skater goes around a turn that has a radius of 36 m. The skater has a speed of 12 m/s and experiences a centripetal force of 461 N
Two high-current transmission lines carry currents of 27.0 A and 80.0 A in the same direction and are suspended parallel to each other 35.0 cm apart. what magnetic force does each segment exert on the other
A helicopter flies at a constant altitude towing a mass M of 119 kg. The helicopter and the mass have a horizontal acceleration of 2.54 m/s^2. Ignore air resistance find the tension in the cable.
The voltage across an air-filled parallel-plate capacitor is mesured to be 200 v. find the dielectric constant of the inserted material
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