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Q. The masses of the earth and moon are 5.98x1024 and 7.35x1022 kg, respectively. Identical amounts of charge are placed on each body, such that the net force (gravitational plus electrical) on each is zero. What is the magnitude of the charge placed on each body?
Q. A person can survive a feet-first impact at a speed of about 12 m/s (27 mi/h) on concrete; 15 m/s (34 mi/h) on soil; and 34 m/s (76 mi/h) on water. Why are there different values for different surfaces?
An electron is moving at a speed of 1.0 x10^4 m/s in a circular path of radius of 2.1cm inside a solenoid. The magnetic field of the solenoid is perpendicular to the plane of the electron's path. The solenoid has 25 turns per centimeter.
What was the speed of the car before impact
Compute the coefficient of kinetic friction
The sport with the fastest moving ball is jai alai, where measured speeds have reached 303km/h. If a professional jai alai player faces a ball at that speed and involuntarily blinks, he blacks out the scene for 100ms. How far does ball move throughou..
What is relative velocity
Just by the impact, the clay has speed v0 = 9 m/s, and the disk is rotating clockwise with angular speed w0 = 0.4 rad/s. Just following the impact, what is an angular speed of the combined system of wheel plus clay.
A rock of mass m = 2 kg is tied to a string of length L = 1.9 m and is twirled in a vertical circle. The speed v of the rock is constant; that is, it is the same at the top and the bottom of circle.
What is the total flux
The center of a 1.40km diameter spherical pocket of oil is 1.5 km beneath the Earth's surface.Estimate by what percentage directly above the pocket of oil would differ from expected value of g for a uniform Earth? Assume the density of oil is 8.0 ..
A number of people are riding in a hot-air balloon. The combined mass of the people and balloon is 281 kg. The balloon is motionless in the air, since the downward-acting weight of the people and balloon is balanced by an upward-acting 'buoyant' f..
What is the speed of each ball as it strikes the ground? How far apart are the balls 0.700 s after they are thrown.
A solid, rectangular iron bar measures .40cm by 1.0cm by 30cm. Find the resistance between each of the three pairs of opposing faces, assume the faces in question are quipotentials.
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