Physics 104 Exam 2

The volume of water displaced by a floating 20-ton boat A. is the volume of the boat B. depends on the shape of the ship's hull C. is the volume of 20 tons of water D. is 20 cubic meters E. none of these

c. is the volume of 20 tons of water

A piano tuner knows that a key on the piano is tuned to the frequency of his tuning fork when he strikes them at the same time and the number of beats he hears each second is A. 0 B. 1 C. 2 D. 3 E. 4

A. 0

The fastest moving plane in a solar system is A. the smallest planet B. the planet nearest the sun C. the planet farthest from the sun D. the most massive planet E. any planet, for they wall move at the same speed

B. the planet nearest the sun

One hundred Joules of heat is added to a system that performs 60 joules of work. The internal energy changes of the system is A. 0 J B. 60 J C. 100 J D. 40 J E. none of the above choices are correct

D. 40 J

Which of the following is not a compound? A. water B. ammonia C. salt D. air E. all are compounds

D. air

Earth's satelites are typically more than 100km high so as to be above the Earth's A. gravitational field B. atmosphere C. both of these

b. atmosphere

Two identical blocks of iron, one at 10 degrees C and he other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees C. This would violate the A. 2nd law of thermodynamics B. 1st law of therodynamics C. both of these D. niether of these

A. 2nd law of thermodynamics

Radio waves travel at the speed of light, 300.000 km/s. the wavelength of a radio wave received at 100 megahearts is A. 3.0 m B. 0.3 m C. 300 m D. 30 m E. none of these

A. 3.0 m

When a living cell doubles in diameter, the amount of its material to be nourished is multiplied by eight, but the amount of membrane through which to feed it is multiplied by A. 4 B. 2 C. 8 D. more than 8

A. 4

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. areas B. radii C. diameters D. all of these E. none of these

A. areas

The main difference between gases and plasmas has to do with A. electrical conduction B. the kinds of elements involved C. the proportion of matter to anitmatter in the universe D. interatomic spacing E. fluid pressure

A. electrical conduction

To turn ice at zero degrees Celsius to water at zero degrees celsius, we must add A. energy B. temperature C. force D. time E. it cant be done - water is always warmer than that

A. energy

When you touch a cold piece of ice with your finger, energy flows A. from your finger to the ice B. from the ice to your finger C. actually both ways

A. from your finger to the ice

As a system becomes more disordered, entropy A. increases B. decreases C. remains the same

A. increases

Your feet feel warmer on a rug than on your tile floor because your rug A. is a better insulator than your tile B. is usually warmer than your tile C. for the same mass has more internal energy than your tile D. all of these E. none of these

A. is a better insulator than your tile

A thermos bottle has double glass walls with silver coating on the glass surfaces that face one another. The silver coating reduces the energy that is transferred by A. radiation B. convection C. friction D. conduction E. none of these

A. radiation

A strong spring is stretched 10 cm by a suspended weight. If the weight is doubled the spring will stretch A. no more B. another 10 cm, making the total stretch 20 cm C. another 5 cm, making the total stretch 15 cm D. another 30 cm, making the total stretch 40 cm E. more than another 30 cm

B. another 10 cm, making the total stretch 20 cm

Stone labs are stronger under A. tension B. compression C. same strength

B. compression

A sound source of high frequency emits a high A. amplitude B. pitch C. speed D. all of these E. none of these

B. pitch

If an astronaut landed on a planet made of antimattter, there would be an explosion and A. an amount of planet matter equal to that of the astronaut would annihilate B. the astronaut and an equal amount of the planet would both annihilate C. the planet would annihiliate D. the astronaut would annihiliate

B. the astronaut and an equal amount of the planet would both annihiliate

An egg is placed at the bottom of a bowl filled with water. Salt is slowly added ti the water untill the egg rises and floats. From this experiment, one concludes A. calcium in the egg shell is repelled by sodium chloride B. the density of salt water exceeds the density of egg C. salt sinks to the bottom D. buyount force does not always act upward

B. the density of salt water exceeds the density of egg

Consider two mercury barometers, one with twice the cross- sectional area of the other. neglecting capillarit, mercury in the smaller tube will rise A. more than four times as high as the larger tube B. the same height as in the larger tube C. twice as high as mercury in the larger tube D. four times as high as mercury in the larger tube E. none of these

B. the same height as in the larger tube

In designing a music hall, an acoustical engineer deals mainly with A. resonance B. wave interference C. beats D. modulation E. forced vibations

B. wave interference

Atmospheric pressure is caused by the A. temperature of the atmosphere B. weight of the atmosphere C. density of the atmosphere D. effect of the sun's energy on the atmosphere

B. weight of the atmosphere

Near the top of a mountain, water in an open pot boils at A. the same temperature as at sea level B. a higher temp than at sea level C. a lower temp that at sea level D. none of the above choices are true

C. a lower temp than at sea level

Which has the greater density, a lake full of water or a cup full of lake water? A. the cup full of lake water B. the lake full of lake water C. both have the same density D. It is impossible to tell without knowing the size of the lake

C. both have the same density

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is A. copper gets hotter before Iron B. iron gets hotter before copper C. copper expands more than iron D. iron expands more than copper E. none of these

C. copper expands more than iron

A Doppler effect occurs when a source of sound moves A. away from you B. towards you C. either towards you or away from you D. in a circle around you

C. either towards you or away from you

A substance that heats up relatively quickly has a A. high specific heat B. high conductivity C. low specific heat D. low conductivity

C. low specific heat

The weight of matter comes mostly from its A. electrons B. nuclei C. niether of these

C. niether of these

The pendulum with the greatest frequency is the pendulum with the A. shortest length B. shortest period C. shortest period and the shortest length D. shortest amplitude E. greatest amplitude

C. shortest period and the shortest length

There are about as many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of A. large city B. the United States C. the whole world D. a large auditorium E. none of these

C. the whole world

During a very cold winter, water pipes sometimes burst. The reason for this is A. the thawing process releases pressure on the pipes B. the ground contracts when colder, pulling pipes apart C. water expands when freezing D. water contracts with freezing E. none of these

C. water expands while freezing

A wave oscillates up and down two complete cycles each second. If the wave travels an average distance of 6 meters in one second, its wavelength is A. 6 m B. 0.5 m C. 2 m D. 3 m E. 1 m

D. 3 m

Without air resistance, a projectile fired horizontally at 8 km/s from atop a mountain will A. return later to its starting position and repeat its falling behavior B. accelerate downward at g as it moves horizontally C. trace a curve that matches the earth's curvature D. all of these E. none of these

D. all of these

In drinking soda or water through a straw, we make use of A. Bernoulli's principle B. surface tension C. capillary action D. atmospheric pressure E. none of these

D. atmospheric pressure

Energy transfer by convection is primarily restricted to A. liquids B. solids c. gases D. fluids E. none of these

D. fluids

A dam is thicker at the bottom than at the top partly because A. it looks better B. water is denser at deeper levels C. surface tension exists only on the surface of liquids D. water pressure is greater with increasing depth E. none of these

D. water pressure is greater with increasing depth

What prevents satellites such as the space shuttle from falling? A. gravity B. centrifugal force C. centripetal force D. the absence of air drag E. nothing; they are continually falling as they orbit the Earth

E. nothing they are continually falling as they orbit the earth

When you tune a radio to a certain station, you match the frequency of he internal electrical circuit to the frequency of the wanted radio station. In so doing you are employing the principle of A. wave interference B. forced vibrations C. reverberation D. beats E. resonance

E. resonance