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An electron is held up against the force of gravity by theattraction of a fixed proton some distance above it. How far above the electron is the proton?
A plane drops a package of food to stranded caribou on an ice flow in the Artic circle. How far short of the target should it drop the package
A 100 Ohm resistor dissipates heat to its surroundings, isothermally. The resistor maintains a constant temperature of 300 K. How much energy does the surroundings absorb
A 5-turn coil has square loops measuring 0.200 m along a side and a resistance of 3.00 ohms. It is placed in a magnetic field that makes an angle of 40.0° with the plane of each loop. The magnitude of this field varies with time according to B= 2.00t..
A young boy with a broken leg is undergoing traction. What is the magnitude of the force exerted on the femur by the lower leg
An automobile engine slows down from 3000 rpm to 900 rpm in 4.5 s. find the total number of revolutions the engine makes in this time
A helicopter is ascending vertically with a speed of 9 m/s. At a height of 200 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach ground.
A solar flare blowing out from the sun at 0.90 c is overtaking a rocket as it flies away from the sun at 0.60 c. with what speed is the flare gaining on the rocket
In a Broadway performance, an 65.2-kg actor swings from a 4.50-m-long cable that is horizontal when he starts. What maximum height do they reach after their upward swing
The coefficient of kinetic friction between the block and incline is = 0.45. The mass of the spring is negligible.
A car of mass 1540 kg rests on a hydraulic lift with a piston of radius 0.27 m that is connected to a second piston of radius 0.031 m. what is the force at the second piston
A 62 g Frisbee is thrown from a point 1.3 m above the ground with a speed of 15 m/s. What was the reduction in the mechanical energy of the Frisbee-Earth system because of air drag
If you are in a car accident with an initial speed of 119 km/h and you are stopped by an airbag that inflates from the dashboard, over what distance should the airbag stop you for you to survive the crash.
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