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Suppose that Superman wants to stop Earth so it does not rotate. He exerts a force on Earth at Earth's equator tangent to its surface for a time interval of 1 year. The mass of Earth is 5.98x1024kg , the radius is 6.37x106m . Assume that Earth is a solid sphere with its mass distributed uniformly.
What magnitude force must he exert to stop Earth's rotation?
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Two 72.0 kilogram hockey players skating at 5.45 m/s collide and stick together. If the angle between their initial directions was 115o, find what is their speed after the collision
Calculate the de Broglie wavelength ? of an electron with energy EF in sodium, and compare the value with the atomic separation R in sodium
The intensity of sound wave A is 100 times that of sound wave B. Relative to wave B, find the sound level of wave A
A car of 1200 kg mass enters an unbanked, curved roadbed of radius 70 m. find the maximum speed with which the car can take the turn
the hypodermic syringe in the figure below contains water. the barrel of the syringe has a cross-sectional area a1
A piston in an automobile engine is in simple harmonic motion. Its amplitude of oscillation from the equilibrium (centered) position is +/- 7.86 cm and its mass is 1.684 kg. Find the maximum velocity of the poston
a flat mirror and a wall meet at a 45 degree angle. light strikes the mirror 10 meters from the corner at an angle of incidence of 45 degrees
A 1172kg car traveling to thewest slows down uniformly from 20.0m/s to 5.0m/s. How far does the car travel during the deceleration
A metal container, which has a mass of 9.4kg contains 18kg of water. A 1.8 kg piece of the same metal, initially at a temperature of 200°C, is dropped into the water. The container and the water initially have a temperature of 14.1°C and the final..
Calculate the electric field from four point-charge: +q at -d and -q at -d/2; 2q at d and -2q at d/2 on the z-axis, First calculate the electric potential, and then calculate its radient.
Clarify how Einstein's contribution to understanding the force between the earth and the moon differed from Newton's. Include a short statement of Einstein's explanation in the answer.
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