1.Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. 1) How far away is the planet Venus if the round-trip echo time is 1000 s?

EMW (Electromagnetic waves) are produced by   A. A proton speeds up from 50m/s to 75m/s   B. An electron moves with a constant speed of 35m/s in a straight line.   C. Stationary electrons   D. A neutron moves with a velocity of 200 m/s

Do radio waves travel at the speed of sound or at the speed of light? Explain.

Block A rests on a horizontal tabletop. A light horizontal rope is attached to it and passes over a pulley, and block B is suspended from the free end of the rope. The light rope that connects the two blocks does not slip over the surface of thè pulley (radius 0.080 m) because the pulley rotates on a frictionless axle. The horizontal surface on which block A (mass 3.70 kg) moves is frictionless. The system is released from rest, and block B (mass 6.00 kg) moves Part A What is the tension force that the rope exerts on block B? downward 1.80 m in 2.00 s. Express your answer with the appropriate units. HÁ TB = Value Units Submit Request Answer Part B What is the tension force that the rope exerts on block A? Express your answer with the appropriate units. HẢ 王新 TA= Value Units