1. calculate the kinetic energy of a car with a mass of 500 kg traveling at a velocity of 10 m/s north. a. 2,500 j b. 50,000 j c. 100 j d. 25,000 j 2. a rock has a mass of 25 kg. the acceleration due to gravity is 10 m/s^2 and the height of the height of the rock is 42 m. find the potential energy of the rock. a. 1,050 j b. 5,250 j c. 220,500 j d. 10,500 j 3. thermal equilibrium is reached when a. objects have enough kinetic energy for them to be at terminal velocity b. the sound vibrations reach a high pitch c. two objects in contract with each other are the same temperature d. the net force on an object is zero

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?

Which of the following is not a means to accelerating? question 4 options: a)increase speed b)remain still c)decrease speed d)change direction