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An astronaut travels to a star system 4.5 ly away at a speed of 0.9c. Suppose that the time needed to accelerate and decelerate is negligible. The journey take according to Mission Control on earth takes 5 years. And the journey takes2.2 years according to the astronaut
How much time (s) elapses among the launch and the arrival of the first radio message from the astronaut saying that she has arrived? Express your answer using two important figures.
An electron is at rest just above the surface of a sphere with the radius of 1.90 mm and a uniformly distributed positive charge of 2.1 x10-15 C.
A small airplane has a mass of 2500 kg and is flying at a speed of 100. m/s at a height of 340 m above the ground. Determine the kinematic energy of the airplane while it is flying
Two strings equal in length and made of the same material are subjected to tensions
A copper cylinder 1.50m long and 40.0cm in diameter stands onone end. What is the mass of the cylinder? What force does it exert on the ground?
a skier is gliding along at 2.0 ms on horizontal frictionless snow. he suddenly starts down a 12deg incline. his speed
how much power must you exert to horizontally drag a 30.0kg table 12.0m across a brick floor in 25.0s at constant
at a time when mining asteroids has become feasible astronauts have connected a line between their 3130-kg space tug
A luggage handler pulls a 20.0-kg suitcase up a ramp inclined at 24.0° above the horizontal by a force of magnitude 148 N that acts parallel to the ramp. Calculate the work done on the suitcase by the force
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 159-kg laser sensor which measures the thickness of the ice, find the tension in the cable towing the sensor
A coin is placed 10.1 cm from the axis of a rotating turntable of variable speed. What is the speed ( in rpm) of the turntable when the coin slides off
Two identical diverging lenses are separated by 13 cm. The focal length of each lens is -8.4 cm. Determine the final image distance relative to the lens
assume four objects each of mass m are placed at the corners of a square os side length, How much work is needed to separate the planets so that they are infinitely away from each other
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