Physics Questions & Answers

Physics Questions & Answers A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is - CORRECT ANSWER- 10 times as much as the force on the 1-kg book. A 100-N lantern is suspended by a pair of ropes with 120 degrees between them. The tension in each rope is - CORRECT ANSWER- 100-N A ball is thrown into the air at some angle. At the very top of the ball's path, its velocity is - CORRECT ANSWER- Entirely horizontal A ball is thrown straight up. At the top of its path its instantaneous speed is - CORRECT ANSWER- 0m/s A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be - CORRECT ANSWER- The same as the speed it had when thrown upwards. A ball tossed vertically upward rises, reaches its highest point, and then falls back to its startnig point. During this time the acceleration of the ball is always - CORRECT ANSWER- Directed downward A block is at rest on an incline. The force of friction necessary to prevent the block from sliding increases when the incline angle is - CORRECT ANSWER- Increased A care package falls from a high-flying stationary helicopter, its velocity increases and its acceleration - CORRECT ANSWER- Decreases A freight train rolls along a track with considerable momentum. If it were to roll at the same speed but had twice as much mass, its momentum would be - CORRECT ANSWER- Doubled A heavy person and a light person parachute together an wear the same size parachutes. Assuming they open their parachutes at the same time, which person reaches the ground first? - CORRECT ANSWER- The heavy person A hollow spherical planet is inhabite by people who live inside it, where the gravitational field is zero. When a very massive space ship lands on the planet's surface, the gravitational fied inside the planet is - CORRECT ANSWER- Nonzero, directed toward the spaceship A ladybug rests on the bottom of a tin can that is being whirled horizontally on the end of a string. Since the ladybug, like the can, moves in a circle, there must be a force on it. What exerts this force? - CORRECT ANSWER- The can A meteor that originally was heading south breaks up into two chunks. One of the chunks moves southwest. The second chunk was not immediately found, but scientists guessed that they should look for an object heading - CORRECT ANSWER- Southeast