Final Review- Final Physics (10 questions out of 50) (Part 1 of 6)

Suppose a graph of displacement of a body versus time is constructed. The slope of the graph at any point may be identified with: a)average speed. b)instantaneous acceleration. c)instantaneous velocity. d)average acceleration.

C

A car moving initially at 20 m/s comes gradually to a stop in 400 m. What was the acceleration of the car? a)-5 m/s2 b)-20 m/s2 c)-10 m/s2 d)-0.5 m/s2

D

A bullet is fired straight down from a hovering helicopter. If we neglect air friction, then the velocity of the bullet: a)increases at 9.8 m/s each second. b)decreases at 9.8 ft/s during the flight. c)is zero. d)is a constant.

A

A car is driven between two nearby towns at an average speed of 50 miles/hour. The magnitude of the average velocity of the car: a)will be the same as or less than the average speed. b)will be the same as or greater than the average speed. c)will always be the same as the average speed. d)will always be less than the average speed. e)will always be greater than the average speed.

A

A football is thrown upward at some angle above the horizontal. If we neglect air friction, then we can conclude that the acceleration vector of the football is: a)down. b)zero. c)along the direction of motion. d)opposite to the velocity vector.

A

Which of the following quantities relating to motion is not a vector? a)Velocity b)Displacement c)Average velocity d)Speed e)Acceleration

D

A 10 pound iron ball and a 2 pound iron ball are dropped simultaneously from a height of 100 meters. Neglecting air resistance, which ball will reach the ground first? a)the 10 lb ball b)They will reach the ground at the same time c)the 2 lb ball

B

A body is traveling at a speed of 25 m/min at time t. Given a constant acceleration of 5 m/min2, what is the speed of the body at time t + 15 min? a)40 m/min b)100 m/min c)10 m/min d)125 m/min e)325 m/min

B

After 1 second, a ball dropped from rest will have fallen: a)9.8 m. b)4.9 m. c)1.0 m. d)2.45 m. e)19.6 m.

B

A car starts from rest and reaches 20 m/s in 10 seconds. The average acceleration of the car in m/s2 is: a)Zero b)4.0 c)1.0 d)2.0 e)10.0

D

A ball is allowed to drop from rest. After 1 second its velocity will be: a)9.8 m/s. b)1.0 m/s. c)2.45 m/s. d)4.9 m/s. e)7.35 m/s.

A

A ball thrown upward reaches its maximum height, and then falls back. If air resistance is negligible, its acceleration is: a)the same at all points in the motion. b)the same up and down but zero at the top. c)less on the way up than on the way down. d)less on the way down than on the way up.

A

A person standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball which hits the ground at the base of the cliff with the greater speed is the one initially thrown: a)both hit with the same speed. b)upward. c)downward.

A

A car travels a distance of 80 km. For the first 30 minutes it is driven at a constant speed of 80 km/h. The motor begins to vibrate and the driver reduces the speed to 40 km/h for the rest of the trip. The average speed for the entire trip is: a)47.5 km/h. b)53.3 km/h. c)60.0 km/h. d)50.0 km/h. e)40.0 km/h.

B

A student plots data for the velocity of a body versus the time on a graph. The area under the curve on the graph may be identified as: a)average velocity. b)displacement. c)average speed. d)acceleration.

B

An auto moves 10 meters in the first second of travel, 10 more meters in the next second and 10 meters during the third second. The acceleration of the auto in m/s2 is: a)30 b)Zero c)3.33 d)9.8 e)10

B

The acceleration of a body must be zero at a point where: a)the instantaneous velocity is zero but changing. b)the instantaneous velocity is constant. c)the instantaneous velocity is not zero but changing.

B

A 10 kg object dropped from a certain window strikes the ground in 2.0 s. Neglecting air resistance, a 5 kg object dropped from the same window strikes the ground in: a)4.0 s. b)8.0 s. c)2.0 s. d)1.0 s.

C

A ball is projected straight up with an initial velocity of 20 m/s. After 1 second, its velocity will be: a)14.2 m/s. b)29.8 m/s. c)10.2 m/s. d)20.0 m/s. e)6.6 m/s.

C

A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement? a)Throughout its motion, the ball's acceleration is zero. b)Throughout its motion, the ball's velocity is zero. c)At the highest point in its motion, the ball's velocity is zero. d)At the highest point in its motion, the ball's velocity and acceleration are zero. e)At the highest point in its motion, the ball's acceleration is zero.

C

A car is traveling at the velocity of 20 m/s on a flat road when it reaches the bottom of a hill. It coasts up the hill, coming to rest in 4 seconds. The average acceleration of the car while on the hill is: a)120 m/s2. b)0 m/s2. c)-5 m/s2. d)5 m/s2. e)-20 m/s2.

C

In a speedometer test zone on a highway, you drive 5 miles in 6 minutes. During the test, your speedometer reading is 55 mi/hr. Your speedometer reading is: a)equal to your actual speed. b)lower than your actual speed. c)higher than your actual speed.

C

In order to go from rest to 100 m/s in 20 s, a jet must be able to accelerate at: a)10 m/s2. b)100 m/s2. c)5 m/s2. d)20 m/s2.

C

The following quantities relate to the rate of change of position. Which pair will always have the same magnitude? a)Average speed and instantaneous speed b)Average speed and average velocity c)Instantaneous speed and instantaneous velocity d)Average velocity and instantaneous velocity

C

You toss a ball straight up in the air. At the highest point, the ball's: a)acceleration is zero but not its velocity. b)velocity is zero and the acceleration is upward. c)velocity is zero and the acceleration is downward. d)velocity and acceleration are zero.

C

A ball is projected upward with an initial velocity of 20 m/s. It will reach its maximum height in approximately: a)2.5 s. b)1 s. c)1.5 s. d)2 s. e)3 s.

D

A body released from rest falls with an acceleration of 9.8 m/s2. If the same body is thrown upward at an angle, and air resistance is negligible, its acceleration will be: a)upward, and equal to 9.8 m/s2. b)downward, and greater than 9.8 m/s2. c)upward, and greater than 9.8 m/s2. d)downward, and equal to 9.8 m/s2. e)downward, and less than 9.8 m/s2.

D

A car is decelerating at the rate of 3 km/s2. If its initial speed is 66 km/s, how long will it take the car to come to a complete stop? a)220 s b)192 s c)2.2 s d)22 s

D

A car rolls down an incline starting from rest. A graph of position versus time is made for this motion. One can get the: a0distance traveled from the slope of the graph. b)velocity from the area under the graph. c)acceleration from the slope of the graph. d)instantaneous velocity from the slope of the graph. e)acceleration from the area under the graph.

D

A policeman walks on his beat back and forth. His average speed is determined from: a)time divided by his total path covered. b)his displacement divided by the time. c)time divided by his displacement. d)his total distance covered divided by the time.

D

A quantity that is a measure of how the velocity of a body changes with time is: a)Speed. b)Displacement. c)Momentum. d)Acceleration.

D

A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The acceleration of the ball is: a)0.5 m/s2. b)0.125 m/s2. c)1.0 m/s2. d)0.25 m/s2.

D

A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The average speed of the ball is: a)1.0 m/s. b)0.5 m/s. c)2.0 m/s. d)0.25 m/s.

D

An auto, starting from rest, undergoes constant acceleration and covers a distance of 1000 meters. The final speed of the auto is 80 meters/sec. How long does it take the car to cover the 1000 meters? a)32 s b)100 s c)9.8 s d)25 s

D

Assuming g = 10 m/s2 and that air resistance is negligible, in 1/2 second a ball dropped from rest will fall: a)one meter. b)1/2 meter. c)5 meters. d)1.25 meters.

D

For a body moving with constant acceleration, which of the following graphs will be a straight line? a)Time versus displacement b)Displacement versus time c)Displacement versus velocity d)Velocity versus time e)Velocity versus displacement

D

In order to find the depth of a well, you drop a stone into it and time its fall. It hits the water after falling for 2 s. The depth of the well is about: a)10 m. b)2 m. c)40 m. d)20 m.

D

The velocity of a body is graphed as a function of time. The slope of the graph at any point may be identified with: a)instantaneous velocity. b)instantaneous speed. c)average velocity. d)instantaneous acceleration. e)average acceleration.

D

During the first 10 seconds after a ball is dropped from rest, how far will it fall? a)980 m b)100 m c)245 m d)1960.0 m e)490 m

E

Suppose you throw a ball vertically upward with a speed of 49 m/s. Neglecting air friction, what would be the speed of the ball one second later? a)49 m/s b)32 ft/s2 c)18 m/s d)10 m/s e)39.2 m/s

E

The acceleration of a body is given by the slope of a graph plotting: a)velocity versus displacement. b)displacement versus time. c)time versus velocity. d)time versus displacement. e)velocity versus time.

E

A quantity that is a measure of how the distance traveled changes with time is: a)speed. b)displacement. c)momentum. d)acceleration. e)velocity.

A

A stone is thrown upward from a bridge at a speed of 10 m/s. It narrowly misses the bridge on the way back down, and hits the water at 30 m/s. The bridge is about: a)40 m high. b)10 m high. c)30 m high. d)3 m high.

A

An iron vise falls from rest at a great height. Neglecting air resistance, what is its speed after it has fallen for 5 seconds? a)49 m/s b)9.8 m/s c)9.8 m/s2 d)49 m/s2

A

If your average speed for a 3 hr trip is 45 mi/hr, the distance traveled is: a)135 mi. b)202.5 mi c)15 mi. d)45 mi.

A

An iron vise falls from rest at a great height. Neglecting air resistance, what distance has it fallen in the first 5 seconds? a)98 m b)122 m c)49 m d)245 m

B

An object rises at 5 m/s under the influence of gravity only. One second later the object is: a)rising at 4 m/s. b)falling at 5 m/s. c)neither rising nor falling. d)rising at 5 m/s.

B

If you drop a ball in the absence of air resistance, it accelerates downward at 9.8 m/s2. If instead you throw the ball upward, then its acceleration after release is a)less than 9.8 m/s2. b)equal to 9.8 m/s2. c)greater than 9.8 m/s2.

B

In a laboratory on Earth, all the air is pumped from a large tube. A feather and a steel ball are simultaneously released from rest inside the tube. What happens next? a)The feather falls and hits the bottom before the steel ball b)Both objects fall and hit the bottom at the same time c)The steel ball falls and hits the bottom before the feather d)Both objects float weightless inside the tube

B

Two displacement vectors are added: one of length 2.0 m and one of length 3.0 m. Not knowing the respective directions, we can say that the length of the sum of the vectors will be: a)5.0 m. b)between 5.0 m and 1.0 m. c)less than 1.0 m. d)between 5.0 m and 3.0 m. e)2.0 m.

B