PHYSICS SEMSTER 1 FINAL

A skater uniformly decreases her speed from 6.0 m/s to zero over a distance of 12 m. What would her acceleration be? (Hint: Use a kinematic equation.)

-1.5 m/s2

If an automobile's velocity changes from 25 m/s to 15 m/s in 2 s, then what is its acceleration?

-5 m/s2

An automobile is approaching an intersection with a yellow light. The automobile is traveling with a velocity of 20.0 m/s, and has a reaction distance of 15.0 m before the driver starts to apply the brakes. The automobile has a braking distance of 35.0 m. What is the automobile's rate of NEGATIVE ACCELERATION? (Hint: Use a kinematic equation.)

-8.00 m/s2

On the planet Gamma a 4.0-kg mass experiences a gravitational force of 24 N. What is the acceleration due to gravity on Gamma?

6.0 m/s2

Starting from rest, an object slides straight down a frictionless incline with a constant acceleration. The incline is 12 meters long. The object reaches the bottom of the incline 4.0 seconds after it is released. What is the average speed of the object on the incline? (Hint: vavg = (total d)/(total t) or vavg = (vf + vi)/2)

6.0 meters/seconds

The velocity-time graph below represents the motion of an object moving in a straight line. What is the object's speed at time = 3.0 seconds?

6.0meters/seconds

If 1.0 kg = 2.205 lbs, the approximate mass of a high school student is

65 kg

A partial picture of a measurement is shown below. Make an approximation of what value you would record for this measurement.

7.30

A bicyclist rode in a straight line for 2400 meters. She traveled the first 1200 meters at a steady speed of 12 meters per second and the second 1200 meters at a steady speed of 6.0 meters per second. What was her average speed for the 2400 meter trip? (Hint: vavg = (total d)/(total t) or vavg = (vf + vi)/2)

8.0 meters per second

Starting from rest, an object slides straight down a frictionless incline with a constant acceleration. The incline is 12 meters long. The object reaches the bottom of the incline 4.0 seconds after it is released. What is the acceleration of the object on the incline? (Hint: d = at2/2)

8.0 meters/seconds2 ????2

A man standing on a chair weighs 800 N. In order for the chair to support the man, the chair must exert an upward force of

800 N

The force required to accelerate a 2-kg mass at 4 m/s2 is

8N

The pattern shown above was left by an automobile as it dripped oil at a constant rate on the road while being driven. During which section of the trip was the car traveling with constant velocity?

BC

Which statement below best describes what occurs when the yellow-light time at an intersection is increased while all the other variables remain constant?

The GO zone increases, and the STOP zone remains the same

The graph below shows the position of a toy train along a long straight section of track as a function of time. What is the train doing during the time interval from time = 6.0 seconds to time = 7.0 seconds?

The train is at rest.

The graph below shows the position of a toy train along a long straight section of track as a function of time. What is the train doing during the time interval from time = 4.0 seconds to time = 5.0 seconds?

The train is moving toward the start at a constant speed.

Which statement explains why a book resting on a table is in equilibrium?

The weight of the book and the table's upward force on the book are equal in magnitude, but opposite in direction.

An intersection has an improperly timed yellow light, resulting in a Dilemma Zone for drivers. For automobiles traveling at the legal speed limit, which of the following changes can alter the STOP and GO Zone so that the Dilemma Zone can be eliminated?

increasing the yellow-light time.

A coin is resting on a piece of cardboard on a beaker as show in the diagram below.

inertia

A rocket in space can travel without engine power at a constant speed in the same direction. This condition is best explained by the concept of

inertia.

Two students are having a contest to see who has the quickest reaction time. A third student gives them both stopwatches that were started at the same time and tells them to stop them when he says stop. The student with the quickest reaction time will have the stopwatch with the

lowest time recorded

What is a unit of acceleration?

meter/second/second

Starting from rest, a kitten walks 3.6 meters in a straight line in 1.8 seconds. What is the kitten's average speed during the 1.8 seconds? (Hint: v = d/t)

2.0 meters per second

A force of F newtons will give an object with a mass of M an acceleration of A. The same force will give a mass of 2M an acceleration of

2/A

A boy walks 40 meters to the right and then 60 meters to the left on the same straight line. What is his displacement from the starting point?

20 meters to the left

A car accelerates uniformly from rest with an acceleration of 2.5 m/s2. What will be its speed when it has traveled 80 meters? (Hint: vf2 = vi2 + 2ad)

20 meters/second

An automobile accelerates from rest at 3.0 m/s every second (3.0 m/s2). How far does it travel in 4.0 seconds?

24m

A student accelerates a door, with a mass of 10 kg, to close by pushing on it with a force of 25 N. At what force did the door exert on the student?

25 N

The graph below shows the position of a toy train along a long straight section of track as a function of time. What is the instantaneous speed of the train at time = 3.0 seconds?

0.0 meters per second

A student is testing her reaction time by trying to keep a light bulb on for exactly 4.00 s by matching a stopwatch. When she turns the light bulb off, the stopwatch reads 4.13 s. What is her reaction time?

0.13s

A race car driver is being tested for reaction time. In several practice trials, the driver's reaction time was recorded as 0.18 s, 0.22 s, 0.17 s. What was the driver's average reaction time?

0.19s

A baseball pitcher throws a fastball at 42 m/s. If the batter is 18 m from the pitcher, approximately how much time does it take for the ball to reach the batter?

0.43 meters

In the graph below, the acceleration of an object is plotted against the unbalance force applied. What is the mass of the object?

0.5 kg

An automobile is approaching an intersection with a yellow light. The automobile is traveling with a velocity of 20.0 m/s, and goes a distance of 15.0 m before the driver starts to apply the brakes. What is the driver's REACTION TIME? (Hint: Remember how to solve time from velocity and distance)

0.750 s

Starting from rest, an object slides straight down a frictionless incline with a constant acceleration. The incline is 12 meters long. The object reaches the bottom of the incline 4.0 seconds after it is released. What is the ACCELERATION of the object on the incline? (Hint: d = at2/2)

1.5 meters/seconds2 ???

What is the length of a meter stick?

1000 milimeters

A book that is resting on a shelf 1.5 m above the floor has a weight of 12 N. The force the shelf exerts upon the book must be

12N

An automobile travels between the 100-m and 250-m markers on a highway in 10 s. The average speed of the automobile during this interval is

15 m/s

How many significant figures are in 0.00130?

3

The velocity-time graph below represents the motion of an object moving in a straight line. What is the magnitude of the object's average velocity during the first 2.0 seconds? (Hint: vavg = (total d)/(total t) or vavg = (vf + vi)/2)

3.0 meters/second

The velocity-time graph below represents the motion of an object moving in a straight line. What is the magnitude of the acceleration of the object between time = 0 second and time = 2.0 seconds? (Hint: a = (vf - vi)/t)

3.0 meters/second 2

A constant net force of 20 N acts on an object of mass 5 kg. What is the object's acceleration?

4.0 m/s2

An object moving in a straight line has its velocity change from 15 meters per second to 35 meters per second in 5.0 seconds. What is the object's acceleration? (Hint: a = (vf - vi)/t)

4.0 m/s2

The graph below shows the position of a toy train along a long straight section of track as a function of time. What is the average speed of the train during the first 2.0 seconds shown?

4.0 meter per second

The graph above represents the relationship between speed and time for an automobile moving in a straight line. Using any 1-s interval, find the automobile's acceleration.

5 m/s2

A rock was dropped and allowed to fall freely. Using 10 m/s2 for the acceleration due to gravity (g), how far did it fall in 1.0 second? (Hint: d = gt2/2 + vit)

5.0 meter

An automobile is going 20 m/s when it applies the brakes and stops after traveling a distance of 20 m. If the automobile was going at 10 m/s, it would be able to stop in a distance of

5m

Which person has the greatest inertia?

A 110-kg wrestler resting on a mat.

Three students measure the length of their classroom with meter sticks and get the following values: Student A - 6.54 m, Student B - 6.57 m, Student C - 6.52 m, where the students used their own judgment to determine the last digit (cm). Which of the following is a true statement about these measurements?

All three measurements are done with the same standard of precision.

In which of the diagrams below does the block have a net external force acting on it?

C

For this question, the direction east is positive, and the direction west is negative. A vehicle is traveling east at 10 m/s when it starts to undergo a negative acceleration of - 1 m/s2 as it comes to rest. Which of the following quantities will also be negative as the vehicle starts to undergo the negative acceleration coming to rest?

Neither the vehicle's velocity nor the change in position.

A car was traveling along a straight and level road at a speed of 30. meters per second. The driver applied the brakes and the car slowed with uniform acceleration to 14 meters per second in 4.0 seconds. Of the four speed-time graphs below, which best represents the motion of the car?

Speed-time graph straight downward

A car starts from rest and accelerates at 3.0 m/s2 to a speed of 36 m/s in 12 seconds. Of the following, which is a correct description of the car's motion?

The car had an constant acceleration and increasing speed.

The diagram above shows all the forces acting on block A. As a result, block A cannot be

accelerating.

A cart is uniformly accelerating from rest. This means the cart is moving with a constant acceleration. The force on the cart must

also be constant

Students in a class measure their stride, and use that measurement to determine the length of a school's soccer field. As a result, each group arrives at a different value for the length of the field. The way to achieve the most accurate value for the length of the field would be to

average all the values of each group

The graph above represents the relationship between distance and time for an object in straight-line motion. During which interval was the object at rest?

both AB and CD

A distance-time graph of the motion of an object is shown below. Of the following statements about the motion of the object, which is correct? (doesn't start a 0)

constant speed

If there is no net force acting on an object, the object will

continue with constant speed into a straight line

A driver of an automobile brakes as he approaches a crosswalk with pedestrians. Which graph below describes his braking distance in relation to his initial speed.

curving upward

Which distance vs. time graph below would best represent the velocity of a girl on a bike from the moment she sees a tree branch begin to fall in front of her until the bike comes to rest?

d-t graph curving downward

Which pair of graphs represent the same motion?

d-t: curving up v-t: diagonal up

If a mass of a moving object is doubled, its inertia would be

doubled

What is a reasonable definition of velocity?

how far an object travels over a period of time in a given direction

A man is attempting to push a chair across the floor with a constant speed by exerting a force of 50 N. When will the chair exert a force of 50 N on the man?

in all of the above cases

Which of the following will have no effect on the reaction time of a person driving an automobile?

the speed of the automobile

Which of the following is an important consideration in determining the size (length) of the GO Zone for a yellow light?

the width of an intersection

The graph above shows the distance traveled by two objects, A and B. Compared to the speed of object B, the speed of object A is

three times as great

The graph above shows the d-t graph for an automobile. According to the graph, the object is

undergoing constant acceleration