physics final

Question 1

WOF is a vector quantity?

Answer 1

force

NOT speed, time, pressure, volume

Question 2

An object is moving along in a straight line and its VELOCITY IS POSITIVE.

WOF statements is necessarily true?

Answer 2

Object is moving in the POSITIVE DIRECTION

Question 3

An object is moving along in a straight line and its VELOCITY IS DECREASING.

WOF statements is necessarily true?

Answer 3

the value of ACCELERATION is NEGATIVE

Question 4

A rock is thrown straight up from the earth’s surface. WOF statements concerning the NET FORCE acting on the rock at the TOP of its path is true?

Answer 4

the net force is EQUAL to the weight of the rock

Question 5

complete the following statement:

the term NET FORCE most accurately describes

Answer 5

the quantity that CHANGES the VELOCITY of an object

Question 6

A 2.0 kg object moves in a straight line on a horizontal frictionless surface.

Which section of the graph corresponds to a condition of CONSTANT, NONZERO NET FORCE?

Answer 6

III only

Question 7

Several cans of different sizes + shapes are all filled with the SAME LIQUID to the SAME DEPTH.

Then

Answer 7

the PRESSURE on the bottom of each can is the same

Question 8

The diagram shows a U-tube having cross sectional area A and partially filled with oil of density p. A solid cylinder, which fits the tube tightly but can slide without friction, is placed in the right arm. The system reaches equilibrium with the oil on the left side a distance L above the oil on the right side.

Determine the weight of the cylinder

Answer 8

ALpg

Question 9

Pressure can be increased by

Answer 9

BOTH B + C

b) increasing applied force
c) decreasing the area over which the force is applied

Question 10

A boy holds a 60N book at arm’s length for 15 s. His arm is 1.25 m above the ground. Find the work done by the BOY on the book while he is holding it.

Answer 10

0N

Question 10

If a system does positive work ON THE SURROUNDINGS in expanding its volume + the process is EXOTHERMIC (heat transferred out). what happens to the INTERNAL ENERGY of the system?

Answer 10

it DECREASES

Question 11

A 10g peice of gold + a 10g piece of iron, both initially at 20° C, are heated by adding 2000J of energy to each piece. The specific heat of gold is 126 + the specific heat of iron is 461.

which piece of metal experiences LARGER change in TEMPERATURE?

Answer 11

GOLD

bc as specific heat increases .. change in temperature decreases

Question 12

The volume of a fixed gas is changed in an adiabatic process (no heat transfer). The figure below shows the pressure + volume of this gas during the process. What is the sign of the CHANGE IN INTERNAL ENERGY during this process?

Answer 12

NEGATIVE if the transition is A –> B
POSITIVE if the transition is B –> A

Question 13

If two objects are in thermal equilibrium with each other

Answer 13

they cannot be at different temperatures

Question 14

A temperature changes of one degree is the SAME on which of the following temperature scales?

Answer 14

Celsius + Kelvin

Question 15

WOF properties of a gas is not consistent with kinetic theory?

Answer 15

the average speed of the gas molecules is smaller at high temperatures

Question 16

Three blocked labeled A, B, C are floating in water as shown in the drawing. Blocks A + B have the same mass + volume. Block C has the same VOLUME, but it’s submerged to a GREATER DEPTH than the other two blocks. WOF concerning this situations is FALSE?

Answer 16

the volume of water displaced by block A is GREATER than that displaced by block B

Question 17

A horizontal piping system with no change in vertical height. Which labeled points is the water in the pipe under the greatest pressure?

Answer 17

A

Question 18

WOF statements is true

Answer 18

both B + C

Question 19

A fixed sample of neon gas at 293 K is confined to a cylinder with a MOVABLE piston (volume may vary). The gas is then heated until its pressure is DOUBLED. What is the final temperature of the gas?

Answer 19

This cannot be found since the final + initial volumes are unknown.

Question 20

The volume of a carbon dioxide bubble rising in a glass of beer is observed to nearly double as the bobble rises from the bottom to the top of the glass.

Why does the volume nearly double?

Answer 20

The fluid pressure of the beer is greater at the bottom of the glass than at the top.

Question 21

Complete the following statement.

The absolute temperature of an ideal gas is directly proportional to

Answer 21

the average kinetic energy of the gas

Question 22

The Van der Waals equation is given below:

Compared to the ideal gas equation, this equation makes two connections. These corrects account for:

Answer 22

The finite volume of the gas molecules themselves and the INTERMOLECULAR ATTRACTIVE FORCES.

Question 23

Question 24

WOF combination of units is equivalent to the volt (V)?

Answer 24

J/C

Question 25

Question 26

What is the purpose of a Line ISOLATION monitor?

Answer 26

ensures that a circuit is ISOLATED FROM GROUND.