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A 20 kilograms kid is on a swing that hangs from 2.8 meter long chains. Find what is her maximum speed if she swings out to a 50 degree angle?
A farmer throws a sack of wheat vertically downward with an initial speed of 12 m/s from the roof of a mill, 30.0 m above the ground. What is the speed of the sack at impact
A 100 g aluminum calorimeter contains 250 g of water. The two substances are in thermal equilibrium at 10°C. Determine the specific heat of the unknown second sample
A coil of inductance 81 mH and unknown resistance and a 0.84 µF capacitor are connected in series with an alternating emf of frequency 875 Hz. what is the resistance of the coil
IP At a certain distance from the center of the Earth, a 5.0- object has a weight of 3.0 . Find this distance. By what factor does its initial acceleration change
Laura is walking straight toward a plane mirror at a speed of 0.5 m/s relative to the mirror. Find at what speed is her image approaching the mirror
Two charges of equal magnitude exert an attractive force of 3.0×10-4 N on each other. how far apart are the charges
Fifty Circular turns of wire are wound closely together, so that all of them have a radius of close to 0.05,. what is the magnitude of the magnetic field at its center
A beam of neutrons that all have the same energy scatters from the atoms that have a spacing of 9.30×10^?2nm in the surface plane of a crystal
A boy of mass 30.3 kg, jumps off a diving platform2.38 m high. He lands in the water and goes under a distance1.48 m, before he stops. What is the boy's velocity when he hits the water
A driver wearing a seatbelt decelerates at roughly the similar rate as the car itself. Since modern cars have a "crumple zone" built into the front of the car, the car would decelerate over a distance of roughly 1.20 m. Determine net force acting ..
What is the radius of curvature of the mirror. How far would it coast before starting to roll back down.
What frequency is heard by an observer who hears the 450-Hz siren on a police car traveling at 35 m/s away from her
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