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B,C
A person of mass 70.0 kg stands in an elevator that is accelerating upward. Which of the following statements is true? (There may be more than one correct statement for this question.) A. The mass of the person is greater than 70.0 kg. B. The mass of the person is equal to 70.0 kg. C. The persons apparent weight is greater than the persons true weight. D. The persons apparent weight is equal to the persons true weight. TERM 2
c
DEFINITION 2 A pilot of mass 70.0 kg is in a jet that does a vertical circular loop. At the bottom of the loop A. The pilots mass is less than 70.0 kg. B. The pilots mass is greater than 70.0 kg. C. The pilots apparent weight is greater than the pilots true weight. D. The pilots apparent weight is equal to the pilots true weight. TERM 3
false
DEFINITION 3 true or false: the normal force is always equal to the weight of the object supported by the surface TERM 4
150 Newtons
DEFINITION 4 A person pushes on a car in neutral with 150 newtons of force, and it slowly begins to accelerate with an acceleration of 0.50 m/s2. The mass of the car is 1000 kg, and the persons mass is 80.0 kg. What is the magnitude of the force that the car exerts back on you? TERM 5
gravity
DEFINITION 5 What force always acts downward at the surface of earth by definition?
A
Three objects A, B, and C are used in an experiment. A 100 pound force is exerted on A, and is found to accelerate with an acceleration of 20 ft/s2. The same 100 pound force then acts on B and is found to accelerate with an acceleration of 10 ft/s2. Finally the same 100 pound force then acts on C and is found to accelerate with an acceleration of 40 ft/s2. How are the masses of A, B, and C related? The 100 lb force is the only force that acts on these objects. A. Mass of B = 2 mass of A = 4 mass of C B. Mass of C = 2 mass of A = 4 mass of B C. Mass of B = 2 mass of A = mass of C TERM 7
-g for all
DEFINITION 7 A ball is thrown straight up. Ignoring air resistance, is the acceleration ay equal to g, 0, or g at the highest point? just before it hits the ground? immediately after the ball leaves the hand? TERM 8
B
DEFINITION 8 The net torque applied to an object causes A. a linear acceleration of the object. B. the object to rotate with changing angular velocity. C. the object to rotate with constant angular velocity. D. the velocity of the center of gravity to be constant. TERM 9
D
DEFINITION 9 Angular acceleration is equal to A. the angular displacement divided by the time interval. B. the change in angular velocity divided by the change in angular displacement. C. the change in angular displacement divided by the change in angular velocity. D. the change in angular velocity divided by the time interval. TERM 10
D
DEFINITION 10 For an object to be in equilibrium A. it must have constant linear acceleration and constant angular acceleration. B. the net force and the net torque must be equal. C. the net force must be zero and the net torque must be a constant nonzero value. D. the net force and the net torque must be zero.
