physics final Flashcards
WOF is a vector quantity?
force
NOT speed, time, pressure, volume
An object is moving along in a straight line and its VELOCITY IS POSITIVE.
WOF statements is necessarily true?
Object is moving in the POSITIVE DIRECTION
An object is moving along in a straight line and its VELOCITY IS DECREASING.
WOF statements is necessarily true?
the value of ACCELERATION is NEGATIVE
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?
the net force is EQUAL to the weight of the rock
complete the following statement:
the term NET FORCE most accurately describes
the quantity that CHANGES the VELOCITY of an object
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?
III only
Several cans of different sizes + shapes are all filled with the SAME LIQUID to the SAME DEPTH.
Then
the PRESSURE on the bottom of each can is the same
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
ALpg
Pressure can be increased by
BOTH B + C
b) increasing applied force
c) decreasing the area over which the force is applied
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.
0N
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?
it DECREASES
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?
GOLD
bc as specific heat increases .. change in temperature decreases
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?
NEGATIVE if the transition is A –> B
POSITIVE if the transition is B –> A
If two objects are in thermal equilibrium with each other
they cannot be at different temperatures
A temperature changes of one degree is the SAME on which of the following temperature scales?
Celsius + Kelvin
WOF properties of a gas is not consistent with kinetic theory?
the average speed of the gas molecules is smaller at high temperatures
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?
the volume of water displaced by block A is GREATER than that displaced by block B
A horizontal piping system with no change in vertical height. Which labeled points is the water in the pipe under the greatest pressure?
A
WOF statements is true
both B + C
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?
This cannot be found since the final + initial volumes are unknown.
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?
The fluid pressure of the beer is greater at the bottom of the glass than at the top.
Complete the following statement.
The absolute temperature of an ideal gas is directly proportional to
the average kinetic energy of the gas
The Van der Waals equation is given below:
Compared to the ideal gas equation, this equation makes two connections. These corrects account for:
The finite volume of the gas molecules themselves and the INTERMOLECULAR ATTRACTIVE FORCES.
