To travel to a nearby star, a spaceship travels at 0.99c to take advantage of time dilation. If the ship has a mass of 3.0 x 106 kg, how much work must be done to get it up to speed from rest? Compare this value with the annual electricity usage of the United States. Does your answer make you believe that star travel is feasible or not?
Answer to relevant QuestionsAn electron has a total energy of 5.6 MeV. What is its (a) Kinetic energy and (b) Momentum? The Sun’s mass is 1.989 x 1030 kg and it radiates at a rate of 3.827 x 1023 kW. (a) Over time, must the mass of the Sun (1) increase, (2) remain the same, or (3) decrease? (b) Estimate the lifetime of the Sun from this ...In Exercise 37, what would be the escape speed at a distance of two Schwarzschild radii from the center of the “black hole” Sun? Compare your answer to the actual escape speed at a distance of twice the real Sun’s ...Two spaceships, A and B, each with a speed of 0.60c relative to Earth, approach each other head on. (a) The speed of ship A relative to ship B is (1) greater than c, (2) equal to c, (3) less than c. Why? (b) What is the ...Many radioactive sources emit neutrons. One way of detecting them is by measuring the light (energy) given off when they are captured by protons (for example, when they enter water, which contains many hydrogen atoms, each ...
Post your question