Physics 101, Quiz Ch 1-10; Spring 2004

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__ MULTIPLE CHOICE__. Choose the one alternative that best completes the statement or answers the question.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

- If an object falls with constant acceleration, the velocity of the object must <A) be constant also.
. C) continuously change by varying amounts depending on its speed. D) continuously decrease. E) none of these.>__B) continuously change by the same amount each second__ - According to Newton, doubling the distance between two interacting objects <A) divides by 2 the gravitational force between them. B) multiplies by 2 the gravitational force between them.
D) multiplies by 4 the gravitational force between them. >__C) divides by 4 the gravitational force between them.__ - 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 <A) less weight and more mass.
C) less weight and less mass. D) more weight and less mass. E) none of these. >__B) less weight and the same mass.__ - 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 <
B) ahead of the midpoint of the ceiling. C) behind the midpoint of the ceiling. D) more information is needed to solve this problem. E) none of these. >__A) exactly below the midpoint of the ceiling.__ - A torque acting on an object tends to produce <A) equilibrium. B) rotation. C) linear motion. D) velocity. E) a center of gravity. >
- A river 100 m wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank < A) due east of where it started. B) 141 m farther south than where it started.
. D) 100 m farther north than where it started. >__C) 100 m farther south than where it started__ - A flower pot of mass m falls from rest to the ground below, a distance h. Which statement is correct? <A) The speed of the pot when it hits the ground is proportional to h.
. C) The KE of the pot when it hits the ground does not depend on m. D) The speed of the pot when it hits the ground depends on m. E) None of these is correct. >__B) The KE of the pot when it hits the ground is proportional to h__ - A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land 20 m down range. What is the player's pitching speed? <A) about 5 m/s B) about 10 m/s
D) about 25 m/s E) none of these >__C) about 20 m/s__ - A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? <
B) 4 m/s C) 12 m/s D) 48 m/s E) none of these >__A) 3 m/s__ - A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined mass moves at <A) 0 m/s. B) 1/2 m/s.
. D) 1/6 m/s. E) 1.5 m/s.__C) 1/3 m/s__ - Which would be more damaging, driving into a very massive concrete wall with no "give," or having a head-on collision at the same speed with an identical car moving toward you with the same speed? It would be more damaging to hit the <A) car. B) wall.
>__C) both the same.__ - Whereas impulse involves the time that a force acts, work involves the <
B) time and distance that a force acts. C) acceleration that a force produces. >__A) distance that a force acts.__ - When doing somersaults, you'll more easily rotate when your body is <A) straight.
C) no difference.>__B) balled up.__ - When a rock thrown straight upwards gets to the exact top of its path, its <A) velocity is zero and its acceleration is zero.
C) velocity is about 10 m/s and its acceleration is zero. D) velocity is about 10 m/s and its acceleration is about 10 meters per second per second. E) none of these.>__B) velocity is zero and its acceleration is about 10 meters per second per second.__ - What prevents satellites such as the space shuttle from falling? <A) gravity B) the absence of air drag
__C) Nothing; they're falling continuously all around the Earth.>__ - Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 seconds. How much power does the elevator use? <A) 20 W
C) 100 W D) 1000 W E) 20,000 W.>__B) 50 W__ - Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a greater <A) speed. B) acceleration.
. D) all of these. E) none of these. >__C) momentum__ - The force required to maintain an object at a constant velocity in free space is equal to <
. B) the mass of the object. C) the weight of the object. D) the force required to stop it. E) none of these. >__A) zero__ - The difference between impulse and impact force involves the <A) distance the force acts.
C) difference between acceleration and velocity. D) mass and its effect on resisting a change in momentum. >__B) time the force acts.__ - Padded dashboards in cars are safer in an accident than nonpadded ones because an occupant hitting the dash has <A) increased time of impact. B) decreased impulse. C) decreased impact force. D) a and b above.
>__E) a and c above.__