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Problem: Calculate the energy needed to accelerate a spaceship with a mass m = 25 × 103 kg to a speed of 0.40c. Compare this number with the approximate annual energy usage of Earth, 1021 J.
Please include each step and the equations you used for above problem. Thanks!
Because of air resistance a constant torque exerted on the system to keep it spinning at that rate. Assuming that the air exerts a miniscule force on the stick (but a significant force on the ball), identify the force the air exerts on the ball.
A 25 resistor is connected across a 120 source. The resistor is then lowered into an insulated beaker, containing 1.0 of water at 19, for 90 sec, What is the final temperature of water
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A metal cylinder of height h = 0.8m and cross-section S = 0.02m^2, is floating upright in water. The density of the metal cylinder is p metal = 550kg/m^3, and the density of water is p water = 1000 kg/m^3. Compute the length of the cylinder outside t..
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