Final Test 2-5
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A 10-kg brick and a 1-kg book are dropped in a cvacuum. the force of gravity on the 10-kg brick is A) 10 times as much B) one-tenth as much C) zero
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A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about A) four times as much B) the same C) half as much D) twice as much
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A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water A) depends on how high they started B) is greater for the dropped bullet C) is greater for the fired bullet D) is the same for each bullet E) none of these
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A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in meters per second per second? A) 1 B) 2 C) 3 D) 4 E) 3
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A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval it acceleration is A) zero B) 110 km/hr C) 1000 km/hr D) 10 km/hr
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A force is a vector quantity because it has both A) action and reaction counterparts B) magnitude and idirections C) mass and acceleration
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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 A) equal to its weight divided by its mass B) equal to the product of its mass times its weight C) zero
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A kilogram is a measure of an object's A) weight B) size C) force D) mass
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A object's weight may properly be expressed in units of A) newtonsB) cubic centimeters C) kilograms D) meters
c
A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor A) behind the midpoint of the ceiling B) ahead of the midpoint of the ceiling C) exactly below the midpoint of the ceiling D) More information is need to solve this problem E) none of these
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According to Newton's law of inertia, a rail road train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains A) are much too heavy B) move too slowly C) must go up and down hills D) always have forces are acting on a moving object it will
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An airplane flies at 100 km/h in still air. If it flies into a 10 km/h headwind, its groundspeed is A) 100 km?h B) 110 km/h C) 120 km?h D) 90 km?h
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At one instant an object in free fall is moving downward at 50 meters per second. One second later its speed should be about A) 55 m/s B) 50 m/s C) 25 m/s D) 60 m/s E) 100 m/s
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Compared to a 1-kg block of solid iron has the same A) mass B) weight C) volume D) all of these E) none of these
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Compared to the mass of a certain object on Earth, the mass of the same object on the moon is A) the same B) six times as much C one sixth as much D) zero
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Distance is to displacement as A) speed is to velocity B) impulse is to momentum C) force is to weight D) velocity is to acceleration E) None of the above choices are correct
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If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about A) 3 m/s B) 2 m/s C) 6 m/s D) 4 m/s
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If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about A) 1 second B) 10 seconds C) 2 seconds D) not enough information to estimate
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If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be A) greater than the second before B) doubled C) less and less each second D) constant
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If no external forces are acting on a moving object it will A) continue moving at the same velocity B) continue moving at the same speed C) move slower and slower until it finally stops
d
If your automobile runs out of fuel while you are driving the engine stops but you do not come to an abrupt stop. The concept that most explains why is A) gravity B) resistance C) acceleration D) inertia
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It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft? A) about 120 m B) about 180 m C) about 60 m D) more than 200 m
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When a rock thrown straight upwards gets to the exact top of its path, its A) velocity is about 10 m/s and its acceleration is zero B) velocity is zero and its acceleration is about 10 meters per second per second C) velocity is about 10 m/s and its acceleration is about 10 meters per seconds per second D) velocity is zero and its acceleration is zero E) none of these
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Which of the following is not a vector quantity? A) speed B) velocity B) acceleration C) All are vector quantities
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While an object near the earth's surface is in free fall, its A) velocity increases B) acceleration increases C) mass increases D) mass decreases
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Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to A) increase its speed B) revolve in a smaller circle C) continue to follow a circular path D) follow a straight-line path
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Your weight is A) a property of mechanical equilibrium B) equal to your mass C) the gravitational attraction force between you and the Earth D) all of these
