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A tetrahedron has edges of length a, and charge Q at each apex. What is the potential energy of the system?
A 1410-kg racecar is driving around a circular track of radius 161 m. What is the magnitude of the net force acting on the vehicle at this time and the force's direction relative to the velocity
Europa, a moon of jupiter, has an orbital radius of 6.70 x10^8 m, and a period of 3.55 days. What is the mass of Jupiter
Calculate the escape velocity for a planet that has twice the mass of Earth and is half the size of Earth
An initially stationary 2.7 kg object accelerates horizontally and uniformly to a speed of 16 m/s in 3.1 s. What is the instantaneous power due to that force at the end of the interval
The light from a distant star takes 252 years to reach the earth. How far away is the star from the earth
A parallel-plate vacuum capacitor with plate area A and separation x has charges +Q and -Q on its plates. The capacitor is disconnected from the source of charge, What is the change in the stored energy
Two cars with equal mass collide head on. One car is going 18 mph. That car is push backward about 38 feet. What is the speed of other vehicle.
A small steel wire of diameter 1.0mm is connected to an oscillator and is under a tension of 5.7N. What is the power output of the oscillator, assuming that the wave is not reflected back
As a tennis ball is struck, it departs from the racket horizontally with a speed of 27.3 m/s. The ball hits the court at a horizontal distance of 19.3 m from the racket. How far above the court is the tennis ball when it leaves the racket?
You are testing a new amusement park roller coaster with an empty car with mass 113 kg. calculate how much work is done by the friction
If this radiation is directed at a crystal, the first-order maximum in the reflected radiation occurs when the angle of incidence is 2.05o. What is the spacing between reflecting planes in the crystal
An astronaut is traveling in a space vehicle that has a speed of 0.515c relative to Earth. The astronaut measures his pulse rate at 69.0 per minute. What pulse rate does the Earth observer measure
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