Physic

Q: You stand on a bathroom scale at the equator and at the north pole. The scale reading at the equator is _______________ the scale reading at the north pole.

Q: A car goes around a curve at 40 m/s. An accelerometer in the car measures the centripetal acceleration of a 2 kg body in the car to be 8 m/s2. The radius of the curve is __________.

Q: You whirl a 2 kg body attached to a 1 meter cord around your head in a nearly horizontal circle with a speed of 4 m/s. The tension in the cord is _________.

Q: Starting from rest, a 2 kg body acquires a speed of 8 m/s in 2 seconds. The net force acting on the body is __________.

Q: You push on a block on frictionless ice with a force of 8 N, causing it to accelerate at 2 m/s2. The mass of the block is __________.

Q: The weight of a body on the moon is _______________ the weight of the same body on earth.

Q: The mass of a body on the moon is _______________ the mass of the same body on earth.

Q: The resistance to relative motion of two bodies in contact with each other is called __________.

Q: A ball is thrown straight up, and reaches the top of its trajectory, the accelerationa. zero b. 9.8 m/s2 c. points downd. points up

Q: If the earth's mass were suddenly made larger but the moon's mass stayed the same,a. the earth would exert a larger force on the moonb. the moon would exert a larger force on the earthc. the earth would exert a larger force on the moon but the moon would exert the same force on the earth as befored. none of the above

Q: The displacement vector from the equilibrium positiona. is zero b. has its largest magnitude c. points upd. points down

Q: The accelerationa. is zero b. has its largest magnitude c. points upd. points down

Q: The net force on the bodya. is zero b. has its largest magnitude c. points upd. points down

Q: Which of these are SI units?a. centimetersb. newtonsc. poundsd. secondse. none of the above

Q: A 188 pound astronaut in a training exercise experiences an acceleration of 7.2 g's. What is the net force (in Newtons) acting on the astronaut?a. 1,353.6 N b. 6,023.5 N c. 59,030.5 Nd. 13,536 N

Q: An astronaut in a space suit has a total mass of 143.5 kg and is standing on a scale that reads in newtons inside an elevator. If the elevator accelerates upward at the rate of 1.8 m/s2 , what does the scale read?a. 703.2 N b. 1,406.3 N c. 882.3 Nd. 1,664.6 N

Q: Two identical airplanes are executing identical turns around a pylon. One of them is moving at 200 mph, and the other is moving at 100 mph. The centripetal force acting on the airplane moving at 200 mph is __________ the value of the centripetal force acting on the airplane moving at 100 mph.a. one quarter b. one half c. the same asd. twicee. four times

Q: An aircraft weighs 1,500 N, its mass isa. 1,500 kg b. 750 kg c. 153 kgd. mass cannot be determined

Q: Starting from rest, a 20,000 kg aircraft being launched from an aircraft carrier goes from 0 to 90 m/s in 2 seconds. The net force acting on the aircraft isa. 3,600,000N b. 1,800,000 Nc. 900,000 Nd. 450,000 N e. 275,000N

Q: Isaac Newton's contributions to physics includea. the laws of motionb. the law of universal gravitationc. invention of the calculusd. the invention of the reflecting telescopee. all of the above

Q: The sensitive dependence upon initial conditions of the evolution of some physical systems is a feature of a. gravitation b. fractals c. air resistance d. dynamical chaos e. quantum mechanics

Q: Tides are influenced bya. the moonb. the sunc. the uneven surface of the earthd. all of the abovee. none of the above

Q: During the period of one day, the number of high tides at a given point is about a. one b. two c. three d. four e. none of the above

Q: If a body were in orbit very near the surface of the earth, its centripetal acceleration would bea. equal to gb. smaller than gc. larger than gd. dependent on its masse. none of the above

Q: How was the value of G first determined?a. by Cavendish, using a torsion balanceb. by Etvs, using a torsion balancec. via a gedanken experimentd. by Newton, watching an apple falle. none of the above

Q: The symbol G is used to representa. the acceleration of gravityb. the universal gravitational constantc. gramsd. gravitye. none of the above

Q: A body on the surface of the earth weighs 400 lb. The radius of the earth is about 4,000 miles. If this same body were placed on a 4,000 mile high tower, its weight would be a. 100 lbs b. 200 lbs c. 400 lbs d. 800 lbs e. 16,000 lbs

Q: Which statement is incorrect? The gravitational force on an orbiting satellite due to the earth a. aims toward the center of the earth b. depends on the earth's mass c. depends on the satellite's mass d. depends on the distance between the earth and the satellite e. none of the above

Q: As a space shuttle is launched into orbit, the direction of its acceleration a. always points upward b. always points downward c. varies between pointing upward and pointing downward d. stays constant

Q: A heavy truck hits a small car. At any given time during the impact, a. the force the truck exerts on the car is larger than the force the car exerts on the truck b. the force the truck exerts on the car is smaller than the force the car exerts on the truck c. the force the truck exerts on the car is equal to the force the car exerts on the truck d. the only force present is the force of the truck on the car

Q: Two cars crash head on. At any given time during the crash, the magnitudes of the collision forces exerted on each car are exactly equal. This is an example of Newton'sa. first law b. second law c. third lawd. no law

Q: The velocitya. is zero b. has its largest magnitude c. points upd. points down

Q: Suppose I push very hard on the chair, and this time the both the chair moves and I slip backward as well. Then the strength of the force the chair exerts on me is a. less than the force I exert on the chair b. equal to the force I exert on the chair c. greater than the force I exert on the chair d. zero

Q: Suppose I push moderately on the chair, and this time the chair does move. Then the strength of the force the chair exerts on me is a. less than the force I exert on the chair b. equal to the force I exert on the chair c. greater than the force I exert on the chair d. zero

Q: Suppose I push lightly on the chair, and the chair doesn"t move at all. Then the strength of the force the chair exerts on me is a. less than the force I exert on the chair b. equal to the force I exert on the chair c. greater than the force I exert on the chair d. zero

Q: As a body falls through air starting from rest, its velocitya. stays constantb. continuously decreasesc. continuously increasesd. gets larger and larger, eventually reaching a constant valuee. gets smaller and smaller, eventually approaching zero

Q: As a body falls through air starting from rest, its acceleration a. is zero b. stays constant c. continuously decreases d. continuously increases e. gets smaller and smaller, eventually approaching zero

Q: At the highest point on the path of a projectile, its vertical acceleration a. equals g pointing downwards b. equals g pointing upwards c. is zero d. is undetermined e. does not exist

Q: Where is the sun located relative to a planet's orbit about it?a. at the center of the orbit, which is a circleb. at the center of the orbit, which is an ellipsec. at one focus of the ellipse which forms the orbitd. none of the above

Q: Planetary orbits area. parabolas b. ellipses c. circlesd. none of the above.

Q: The vertical acceleration of a projectile a. equals g pointing downwards b. equals g pointing upwards c. equals g pointing sometimes upwards and other times downwards d. is zero e. continuously increases

Q: The horizontal acceleration of a projectile a. is zero b. stays constant c. continuously increases d. continuously decreases e. sometimes decreases and sometimes increases

Q: The vertical speed of a projectile a. is zero b. stays constant c. continuously increases d. continuously decreases e. sometimes decreases and sometimes increases

Q: The horizontal speed of a projectile a. is zero b. stays constant c. continuously increases d. continuously decreases e. sometimes decreases and sometimes increases

Q: You throw a ball straight up, it peaks out, and then comes back down to you. During this motion, the velocity and acceleration a. always point in the same direction b. always point opposite to each other c. sometimes point in the same direction, and other times point opposite to each other d. depend on the way the ball is thrown e. depend on the mass of the ball

Q: The elevator cable breaks.a. 150 lb b. 160 lb c. 170 lbd. none of the above

Q: After moving downwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest.a. 150 lb b. 160 lb c. 170 lbd. none of the above

Q: The elevator accelerates downwards and is now moving at a constant speed.a. 150 lb b. 160 lb c. 170 lbd. none of the above

Q: The elevator is accelerating downwards at 2 ft/s2.a. 150 lb b. 160 lb c. 170 lbd. none of the above

Q: After moving upwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest.a. 150 lb b. 160 lb c. 170 lbd. none of the above

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