Physics 1 Final Questions & Answers

Physics 1 Final Questions & Answers _____ is the branch of science that studies the physical world. - ANSWER: Physics _____ is the length of the route between two points. - ANSWER: Distance ______ is the change in position of an object. - ANSWER: Displacement _________ is a type force that opposes motion between any surfaces that are touching. - ANSWER: friction __________ collisions occur whenever kinetic energy is not conserved, primarily when an object's height is increased after the collision or when one of the objects is compressed. - ANSWER: inelastic "It is 250,000 miles from the earth to the moon" is a qualitative observation. - ANSWER: False "The toy car is about 3 inches long" is an example of a ______ observation. - ANSWER: quantitative 0. has _____ significant figures. - ANSWER: 3 1.00 _____ = 746 watts - ANSWER: horsepower 1.00 watt = 1.00 J/s - ANSWER: true 1732.2097 has ______ significant figures - ANSWER: 8 2,007,000 has ____ significant figures - ANSWER: 4 A 0.050 kg bullet strikes a 5.0 kg wooden block and embeds itself in the block. The block (with the bullet embedded) flies off its stand at 9.0 m/s. What was the original velocity of the bullet? - ANSWER: 909 m/s A 0.050 kg bullet strikes a 5.0 kg wooden block with a velocity of 909 m/s and embeds itself in the block which then flies off its stand. What was the final velocity of the bullet? - ANSWER: 9 m/s A 0.111 kg hockey puck moving at 55 m/s is caught by a 80 kg goalie at rest. With what speed does the goalie slide on the (frictionless) ice? - ANSWER: 0.076 m/s A 0.111 kg moving hockey puck is caught by a 80 kg goalie who then slides on the frictionless ice at 0.076 m/s. What was the initial velocity of the hockey puck? - ANSWER: 55 m/s A 0.5 kg ball is at the top of a ramp which is 8 meters high. How much kinetic energy does the ball have at the bottom of the ramp? - ANSWER: 40 J A 0.50 kg ball traveling at 6.0 m/s due east collides head on with a 1.00 kg ball traveling in the opposite direction at -12.0 m/s. After the collision, the 0.50 kg ball moves away at -14 m/s. What is the velocity of the other ball after the collision? - ANSWER: -2 m/s A 0.500 kg object tied to a string is swung around a person's head in a horizontal circle. The length of the string is 1.00 m and the maximum force the string can withstand without breaking is 25.0 N. What is the maximum speed the object may be swung without breaking the string? - ANSWER: 7.07 m/s A 1500 kg car starts at rest and speeds up to 3.0 m/s. The gain in kinetic energy is 6750 J. We define efficiency as the ratio of output energy (in this case kinetic energy) to input energy. If this car's efficiency is 0.30. How much input energy was provided by the gasoline? - ANSWER: 22,500 J A 2-kg ball rolls down the hill. By the time it is at the bottom, the ball's Kinetic Energy is 25 J. What is its velocity at the bottom of the hill? - ANSWER: 5 m/s