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The mass of a star is 1.75·1031 kg and it performs one rotation in 37.3 days. Find its new period (in /days) if the diameter suddenly shrinks to 0.77 times its present size. Assume a uniform mass distribution before and after.
You exert a force of 25 N on the head of a thumbtack. What is the pressure on your thumb
two blocks, each of mass m=2.80kg are hung from the ceiling of an elevator. If the elevator moves with an upward acceleration a of magnitude 1.9m/s^2, find the tensions T1 and T2 in the upper and lower strings
A galaxy located at a distance D of 1 million light years away has an angular size A= 5 degree. What is the approximate diameter of this galaxy
Compute approximately the time the ball is in contact with the floor to be 0.04 seconds. Compute the average force the floor exerts on the ball.
In a darkened room we place a lighted tungsten bulb in a box that has one end covered with tinfoil. If we make a pinhole in the tinfoil, an image of filament appears on a screen facing the tinfoil.
A 7.80-g bullet moving at 560 m/s penetrates a tree trunk to a depth of 5.2 cm. Use work and energy considerations to find the average frictional force that stops the bullet
a 66.0-kg woman in an elevator is accelerating upward at a rate of 2.8m/s^2. What is the net force acting on the woman
tennis ball A is dropped from a height of 15 m. Tennis ball B is thrown horizontally from a height of 15 m with a horizontal velocity of 25 m/s
A thin 12 cm long solenoid has a total of430turns of wire and carries a current of2.1A. Calculate the magnitude of the field inside near the center
A 218.7 kg satellite is in a circular orbit of 26,273 miles (42,300,000 m) in radius. What is the velocity (speed) of the satellite
A particle moving in a straight line with constant accelaration - Find the velocity of particle at the mid point of the path.
A portable electric heater uses 22 A of current. The manufacturer recommends that an extension cord attached to the heater, What is the smallest radius of copper wire that can be used in the extension cord
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