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Estimate the average kinetic energy of the particles in the Sun. Assume that it is made of atomic hydrogen and that its average temperature is 100,000 K. The mass of the Sun is 2 x 1030kg. K=2.07x10-18J
For how long would the Sun shine using this energy if it radiates 4 x 1026W/s?
A 79kg person holds out his arms so that his hands are 1.6m apart. Normally, a person's hand makes up about 1% of his or her body weight. For round numbers, we shall assume that all the weight of each hand is due to the calcium in the bones.
A parallel-plate capacitor has plates of area 0.40 m2 and plate separation of 0.20 mm. The capacitor is connected across a 9.0-V potential source. What is the magnitude of the charge on each plate
2. The Horseshoe Falls on the Canadian side of Niagara Falls have water that moves horizontally at 9.0 m/s which then falls 53 m vertically into the Niagara River below. Ignoring any air resistance, at what angle does the falling water enter th..
A simple pendulum is made of a small blob of mass m = 9.500 kg attached to the end of an inextensible wire. What is the magnitude of the tension in the wire
a when the universe was a mere 10-4 s old the temperature was about 1013 k. what is the probability that two average
An ideal spring with spring constant 600 N/m is on a 30 degree incline. What is the magnitude of the kinetic friction force as the block slides
A 58-kg bicyclist rides his 10.3-kg bicycle with a speed of 13.8 m/s. Assuming constant acceleration, What is the magnitude of the braking force
parachutist with a camera, both descending at a speed of 13 m/s, releases that camera at an altitude of 110-m.
Adjacent antinodes of a standing wave on a string are 15.0cm apart. A particle at an antinode oscillates in simple harmonic motion with amplitude 0.850 cm and period 0.0750 s.
A rifle bullet with a muzzle speed of 330 m/s is fired directly into a special dense material that stops the bullet in 25.0 cm. Assuming the bullet's deceleration to be constant, what is the magnitude
a rifle with a mass of 2.5 kg fires a bullet with a mass of 0.0045kg. the bullet moves with a muzzle velocity of 350m/s after the rifle is fired
a simple harmonic oscillator of amplitude 6.4mm and frequency 80 hz is attached to the left end of a spring of linear
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