Physics Practice Final Exam Actual Questions With Correct Detailed Answers.

A truly educated person is knowledgeable about - correct answer all of these In science, facts - correct answer may change When you stand at rest on a pair of bathroom scales, the readings on the scales will always - correct answer add up to equal your weight A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is - correct answer about 30 m/s. It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft? - correct answer about 180 m A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is - correct answer zero Compared to the mass of a certain object on Earth, the mass of the same object on the moon is - correct answer the same A 10-N falling object encounters 4 N of air resistance. The net force on the object is - correct answer 6N A vehicle that weights 400 N on the surface of the Earth is traveling in outer space at a speed of 400 m/s . It can be stopped by applying a constant force of 20 N for - correct answer 800 seconds A vehicle that weighs 4000 N on the surface of the Earth is travelling in outer space at a speed of 200 m/s. The smallest constant force that must be applied to stop it in 20 seconds is - correct answer 4000 N Consider massive gliders that slide friction-free along a horizontal air track. Glider A has a mass of 1 kg, a speed of 1 m/s, and collides with Glider B that has a mass of 5 kg and is at rest. If they stick upon collision, their speed after collision will be - correct answer 1/6 m/s A 5-kg shark swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after this meal is - correct answer 1/6 m/s If a ping pong ball and a golf ball are both moving in the same direction with the same amount of kinetic energy, the speed of the ping pong ball must be - correct answer more than the golf ball Neglecting air resistance, a man on a high ladder releases a ball which strikes the ground with 100 J of kinetic energy. If he were to throw it straight upward instead, it will eventually reach the ground with a kinetic energy of - correct answer 100 J A ball rolls down a hill mainly because of - correct answer an unbalanced torque A person weighs less at the equator than at the poles. The main reason for this has to do with - correct answer the spin of the earth A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above the Earth's surface. How much would she weigh there? - correct answer 100 N Which produces a greater tidal effect in your body, the moon or a 1-kg melon held above your head? - correct answer the melon A woman on the surface of the Earth has a mass of 50 kilograms and a weight of 490 newtons. If the woman were floating freely inside a space habitat far away from Earth, she would have - correct answer less weight and the same mass An object is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward at an angle instead, its acceleration will be - correct answer 1 g downward If two protons are removed from an oxygen nucleus, the result is - correct answer carbon Compared to the mass of a hydrogen atom, the mass of an oxygen atom is - correct answer 16 times as great Compared to a bar of pure gold, the density of a pure gold ring is - correct answer the same When a chocolate bar is cut in half, its density is - correct answer unchanged The ratio of output force to input force of a hydraulic press will be equal to the ratio of the output and input piston - correct answer areas A liter-sized block of ordinary wood floats in water. The amount of water displaced is - correct answer less than one liter A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the same column instead had the same mass of mercury in it, the height of the mercury column would be - correct answer about 3/4 meter Estimate the mass of air inside an average automobile. - correct answer 2 kilograms During a very cold winter, water pipes sometimes burst. The reason for this is - correct answer water expands when freezing If you measure a plot of land with a brass tape on a cold day, the actual amount of land you have will be - correct answer larger when measured The reason the sun's radiant energy is of shorter wavelengths than the Earth's is because the sun - correct answer a higher temperature than the earth Substances absorb heat energy by the process of - correct answer all of these Near the top of a mountain, water in an open pot boils at - correct answer a lower temperature than at sea level To increase the temperature of 50 grams of water by 2 Celsius degrees requires - correct answer 100 calories How many vibrations per second are associated with a 101-MHz radio wave? - correct answer 101,000,000 As a train of water waves goes by, a piece of cork floating on the water bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave? - correct answer 2 m/s