Physics Final
A balloon is buoyed up with a force equal to the A- weight of air it displaces B- Density of surrounding air C- atmospheric pressure D- weight of the balloon and contents E- all of these
A
A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is A- zero B- 10 km/hr C- 110 km/hr D- 1000 km/hr
A
Chinook winds tend to A) warm an environment. B) cool an environment. C) cool deserts at night. D) warm deserts at sunrise.
A
Evaporation is a cooling process because A) heat is radiated during the process. B) of conduction and convection. C) the more energetic molecules are able to escape the liquid. D) the temperature of the remaining liquid decreases. E) none of these
A
If the radius of the Earth somehow decreased with no change in mass, your weight would A- increase B- not change C- Decrease
A
If you were caught in freezing weather with only a candle for heat, you would be warmer in A) an igloo. B) a tent. C) a wooden house. D) a car.
A
The weight of matter comes mostly from its A- protons B- electrons C- neutrons
A
We are warmed by condensation because water molecules in the air that strike our bodies A) transfer some of their kinetic energy to us. B) gain kinetic energy as they change state. C) form an insulating layer on our bodies.
A
When a gas is changed to a liquid state, the gas A) releases energy. B) absorbs energy. C) neither releases nor absorbs energy. D) both releases and absorbs energy.
A
When a volume of air is compressed and no heat enters or leaves, the air temperature will A- increase B- decrease C- remain unchanged
A
When a volume of air is compressed, its temperature A) increases . B) decreases. C) neither increases nor decreases.
A
A car travels in a circle with constant speed. The net force on the car is A- directed forward, in the direction of travel B- directed toward the center of the curve C- zero because the car is not accelerating D- none of these
B
A flywheel's mass is twice that of another of the same size and shape. The more massive flywheel's rotational inertia is A- four times the other's B- two times the other's C- the same as the other's D- half the other's
B
A hydraulic press multiplies a force by 100. This multiplication is done at the expense of A- energy, which is divided by 100 B- the distance through which the force acts C- the time through which the force acts, which is multiplied by 100 D- the mechanism providing the force E- none of these
B
A metal block has a mass of 5 grams and a volume of 1 cubic centimeter. A piece of the same kind of metal with a volume of 2 cubic centimeters has a density of- A- 2.5 g/cc B- 5g/cc C- 10 g/cc
B
An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the force will be A- zero B- 40 N C- 120 N D- 360 N E- 1080 N
B
An object following a straight-line path at constant speed A- has a net force acting upon it in the direction of motion B- has zero acceleration C- has no forces acting on it D- none of these
B
Before ice can form on a lake, all the water in the lake must be cooled to A) zero degrees C. B) 4 degrees C. C) minus 32 degrees C. D) None of the above. Ice can form at the surface regardless of the water temperature below.
B
Consider a sample of ice at 0 degrees C. If the temperature is decreased, the volume of the ice A) increases. B) decreases. C) stays the same.
B
During a very cold winter, water pipes sometimes burst. The reason for this is A) the ground contracts when colder, pulling pipes apart. B) water expands when freezing. C) water contracts when freezing. D) the thawing process releases pressure on the pipes. E) none of these
B
Heat energy travels from an object with a high A) internal energy to an object with a lower internal energy. B) temperature to an object with a lower temperature. C) Both of these, for they say essentially say the same thing. D) None of the above choices are true.
B
If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about A- 1 second B- 2 seconds C- 10 seconds D- 20 seconds E- not enough information to estimate
B
If the Earth's mass decreased to one-half its original mass with no change in radius, then your weight would A- decrease to one quarter your original weight B- decrease to one half your original weight C- stay the same D- none of these
B
Near the top of a mountain, water in an open pot boils at A) a higher temperature than at sea level. B) a lower temperature than at sea level. C) the same temperature as at sea level. D) None of the above choices are true.
B
One of the main reasons one can walk barefoot on red-hot coals of wood without burning the feet has to do with A) low temperature of the coals. B) low thermal conductivity of the coals. C) mind over matter techniques.
B
Pour a liter of water at 40 degrees C into a liter of water at 20 degrees C and the final temperature of the two becomes A) less than 30 degrees C. B) at or about 30 degrees C. C) more than 30 degrees C.
B
Systems that are left alone, tend to move toward a state of A) less entropy. B) more entropy. C) no entropy.
B
The chemical properties of matter come mostly from its A- Protons B- electrons C- neutrons
B
The lowest temperature possible in nature is A) 0 degrees C. B) -273 degrees C. C) 4 K.
B
The ratio of output force to input force of a hydraulic press will be equal to the ratio of the output and input piston A- diameters B- areas C- radii D- all of these E- none of these
B
To multiply the input force of a hydraulic lift, the input end should be the one having the A- larger diameter piston B- smaller diameter piston C- relative piston sizes don't matter
B
To turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add A) temperature. B) energy. C) force. D) time. E) It can't be done - water is always warmer than that
B
When a solid is changed to a liquid state, the solid A) releases energy. B) absorbs energy. C) neither releases nor absorbs energy. D) both releases and absorbs energy.
B
When a system does work and no heat is added to the system, its temperature A) increases. B) decreases. C) remains unchanged.
B
When a system does work and no heat is added to the system, its temperature A- increases B- decreases C- remains unchanged
B
When a system does work and no heat is added to the system, its temperature A- increases B- decreases C- remains unchanged
B
When an iron ring is heated, the hole becomes A) smaller. B) larger. C) neither smaller nor larger. D) either smaller or larger, depending on the ring thickness.
B
When gas in a container is squeezed to half its volume and the temperature remains the same, the gas pressure A- halves B- doubles C- quadruples D- remains the same
B
When gas in a container is squeezed to half its volume, its density A- halves B- doubles C- quadruples D- remains the same
B
A block of wood weighing 5 N in air, is difficult to fully submerge in a pool of mercury because the buoyant force when fully submerged is- A- less than 5 N B- 5 N C- much more than 5 N
C
A container of air is at atmospheric pressure and 27 degrees C. To double the pressure in the container, it should be heated to A) 54 degrees C. B) 300 degrees C. C) 327 degrees C. D) 600 degrees C. E) none of these
C
An umbrella tends to move upwards on a windy day principally because A- air gets trapped under the umbrella, warms, and rises B- buoyancy increases with increasing wind speed C- air pressure is reduced over the curved top surface D- all of these
C
During an adiabatic compression of an ideal gas A) the internal energy of the gas remains constant. B) the temperature of the gas does not change. C) no heat is supplied to or removed from the gas. D) no work is done on the gas. E) None of the above choices are true.
C
Hang from a pair of gym rings and the upward support forces of the rings will always A- each be half your weight B- each equal your weight C- add up to equal your weight
C
If an object of constant mass experiences a constant net force, it will have a constant A- velocity B- speed C- acceleration D- position E- more than one of the above
C
The calories needed to change 10 grams of ice at zero degrees C to steam at 100 degrees C is A) 6200. B) 6400. C) 7200. D) 8000. E) None of the above choices are correct.
C
The ideal efficiency for a heat engine operating between the temperatures of 227 degrees C and 27 degrees C is A) 20%. B) 25%. C) 40%. D) 88%. E) none of these
C
The planet Earth loses heat mainly by A) conduction. B) convection. C) radiation. D) all of these
C
When a star collapses to form a black hole, its mass A- increases\ B- Decreases C- remains the same
C
When mechanical work is done on a system, there can be an increase in A) its internal energy. B) its temperature. C) both temperature and internal energy. D) neither temperature nor internal energy.
C
) Consider a piece of metal that is at 5 degrees C. If it is heated until it has twice the internal energy, its temperature will be A) 10 degrees C. B) 273 degrees C. C) 278 degrees C. D) 283 degrees C. E) 556 degrees C.
D
A car moves 4 times as fast as another identical car. Compared to the slower car, the faster car has- A- 4 times the KE B- 8 times the KE C- 12 times the KE D- 16 times the KE
D
A diver who weighs 500 N steps off a diving board that is 10 m above the water. The diver hits the water with kinetic energy of A- 10 J B- 500 J C- 510 J D- 5000 J E- More than 5000 J
D
A skydiver steps from a helicopter and falls for a few seconds until he reaches his terminal velocity. Thereafter, until he opens his parachute, his acceleration A- is constant B- increases C- decreases D- is zero E- none of these
D
A skydiver steps from a helicopter and falls for a few seconds until he reaches his terminal velocity. Thereafter, until he opens his parachute, his acceleration- A- is constant B- increases C- Decreases D- is zero E- None of these
D
A volume of air has a temperature of 0 degrees Celsius. An equal volume of air that is twice as hot has a temperature of A) 0 degrees C. B) 64 degrees C. C) 100 degrees C. D) 273 degrees C. E) None of the above choices are correct.
D
An atomic mass unit is 1/12 the mass of A- an electron B- a proton C- a hydrogen atom D- a carbon atom E- a uranium atom
D
The mass of ice that can be melted by 1 gram of 100-degree-C steam is (Hint: Don't forget about hot water remaining from condensed steam.) A) 0.125 gram. B) 0.148 gram. C) 6.75 grams. D) 8 grams. E) none of these
D
When the distance between two stars decreases by half, the force between them A- decreases by one- quarter B- decreases by one- half C- increases to twice as much D- increases to four times as much E- stays the same
D
When the distance between two stars decreases by half, the force between them A- decreases by one-quarter B- decreases by one-half C- increases to twice as much D- increases to four times as much E- stays the same
D
An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the- A- combined weight of the arrow and bowstring B- air resistance against the bow C- Friction of the ground against the archer's feet D- grip of the archer's hand on the bow E- arrow's push against the bowstring
E
Compared to the energy it takes to separate oxygen and hydrogen from water, the amount of energy given off when they recombine is A- slightly more B- slightly less C- much more D- much less E- the same
E
To increase the temperature of 50 grams of water by 2 Celsius degrees requires A) 0.04 calorie. B) 2 calories. C) 4.18 calories. D) 25 calories. E) 100 calories.
E
A good heat conductor is A) a poor insulator. B) a good insulator. C) neither a poor nor a good insulator.
A
A pot falls from a ledge and hits the ground 45 m below. The speed with which it hits the ground is A- about 30 m/s B- about 60 m/s C- about 120 m/s D- more than 120 m/s
A
A system becomes more disordered, entropy A- increases B- decreases C- remains the same
A
A temperature inversion occurs when the upper layers of air are A) warmer than the lower regions of air. B) cooler than the lower regions of air. C) at the same temperature as lower regions of air.
A
An object will normally be a net radiator of energy when its temperature is A) higher than its surroundings. B) lower than its surroundings. C) neither of these
A
As a system becomes more disordered, entropy A) increases. B) decreases. C) remains the same.
A
At one instant a heavy object in air is moving upward at 50 meters per second. One second later its speed is approximately
A
Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will be A) the black surface. B) the white surface. C) Neither - there is no difference.
A
Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, mercury in the smaller tube will rise A- the same height as in the larger tube B- twice as high as mercury in the larger tube C- four times as high as mercury in the larger tube D- more than four times as high as in the larger tube E- none of these
A
The greater the difference in temperature between the input reservoir and the output reservoir for a heat engine, the A) greater the efficiency. B) less the efficiency. C) Neither - efficiency of a heat engine doesn't depend on temperature difference.
A
The mass of a pet turtle that weighs 10 N is A- about 1 kg B- about 10 kg C- about 100 kg D- about 1000kg E- none of these
A
The minimum amount of 100-degree-C steam needed to melt 1 gram of 0-degree-Celsius ice is A) 0.125 gram. B) 0.148 gram. C) 6.75 grams. D) 8 grams. E) none of these
A
When a volume of air is compressed and no heat enters or leaves, the air temperature will A) increase. B) decrease. C) remain unchanged.
A
When a volume of air is compressed and no heat enters or leaves, the air temperature will A- increase B- decrease C- remain unchanged
A
The faster a fluid moves, the A- greater its internal pressure B- less its internal pressure C- internal pressure is unaffected
B
The higher the temperature of an object A) the longer the wavelengths it radiates. B) the shorter the wavelengths it radiates. C) makes no difference in the wavelengths it radiates
B
When gas in a container is squeezed to half its volume, its density A- halves B- doubles C- quadruples D- remains the same
B
When water at 4 degrees C is heated it expands. When water at 4 degrees C is cooled, it A) contracts. B) expands. C) neither contracts nor expands.
B
Your feet feel warmer on a rug than on a tile floor because a rug A) is usually warmer than tile. B) is a better insulator than tile. C) for the same mass has more internal energy than tile. D) all of these E) none of these
B
A 5-kg shark swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after this meal is- A- 1/2 m/s B- 1/5 m/s C- 1/6 m/s D- 2/3 m/s E- 3/2 m/s
C
A 5000-kg freight car runs into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg car? A- 4 m/s B- 5 m/s C- 6m/s D- 8 m/s E- none of these
C
A block of wood weighing 5 N in air, is difficult to fully submerge in a pool of mercury because the buoyant force when fully submerged is A- less than 5 N B- 5 N C- much more than 5 N
C
Half way to the center of a completely hollow planet with a thin uniform shell, your weight would be A- one-quarter of your weight on the surface B- one-half of your weight on the surface C- three-quarters of your weight on the surface D- the same as at the surface E- zero
E
