# Physics

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Test #2

two

### In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of

orbital electrons

### If an astronaut landed on a planet made of antimatter, there would be an explosion and

the astronaut and an equal amount of the planet would both annihilate

carbon

compression

tension

### A wooden block has a mass of 1000 kg and a volume of 2 cubic meters. What is the block's density?

500 kg per cubic meter

a steel ball

### If an elephant grew to twice its height, the area of its ears would be about

four times what it was

surface area

### Water pressure is greatest against the

bottom of a submerged object

10 tons

### Two life preservers have identical volumes, but one is filled with styrofoam while the other is filled with sand. When the two life preservers are fully submerged, the buoyant force is greater on the one filled with

same on each as long as their volumes are the same

### Surface tension of liquids

decreases as the liquid temperature increases

solar power

### A bubble of air released from the bottom of a lake

becomes larger as it rises

volume

### When you touch a cold piece of ice with your finger, energy flows

from your finger to the ice

larger

Kelvin scale

### If you measure a plot of land with a brass tape on a cold day, the actual amount of land you have will be

larger tan measured

### Newton's law of cooling applies to objects that are

cooling and heating

### The molecules in a room-temperature glass of water jostle around at

a great variety of speeds

release energy

evaporation

### Entropy is closely related to the

2nd law of thermodynamics

### When an ideal gas is subjected to an adiabatic process

none of the above choices are true

decreases

vibration

sound

two of these

vibrating

### The approximate range of human hearing is

20 hertz to 20,000 hertz

speed

True

frequency

loudness

### Fourier discovered that periodic waves can be represented by

the summation of a series of simple sine waves

the same age

### Which potatoes when peeled produce the most peelings?

10 kg of small potatoes

### When an object is partly or wholly immersed in a liquid, it is buoyed up

by a force equal to the weight of liquid displaced

### To multiply the input force of a hydraulic lift, the input end should be the one having the

smaller diameter piston

### In drinking soda or water through a straw, we make use of

atmospheric pressure

weights

10.3m

### A substance that heats up relatively quickly has

low specific heat

### When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is

copper expands more than iron

two of these

fluids

### The pupil of your eye is

a net absorber of radiant energy

down

### A hot dog pants

to help evaporation occur in its mouth and bronchial tract

goes up

### Near the top of a mountain, water in an open pot boils at

a lower temperature than at sea level

4.18 Calories

### The phenomenon of regelation depends on the

open-structured nature of ice crystals

increases

### Vibrations of a longitudinal wave move in a direction

at right angles to the direction of wave travel

2 m

shortens

### Double the frequency of sound and you also double its

none if the above

### Sound will be louder if a struck tuning fork is held

with its base against the table top

high

880 hertz

### Compared to a sound of 30 decibels, a sound of 60 decibels is

1000 times as intense

### Which of the following statements is true?

There are only about 100 different kinds of atoms that combine to form all substances

uranium

### If we doubled the magnifying power of the most powerful optical microscope in the world, we would

still not be able to see or photograph an atom

both the same

unchanged

large potatoes

mittens

1000 kg

### Ice cubes submerged at the bottom of a liquid indicate that the liquid

is less dense than ice

### A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. The density of the rock is

2.5 times the density of water

stretch

1 kilogram

### The faster a fluid moves, the

less its internal pressure

increases

### The main difference between gases and plasmas has to do with

electrical conduction

### Some molecules are able to absorb large amounts of energy in the form of internal vibrations and rotations. Materials composed of such molecules have

high specific heat

becomes wider

300 K

### Metals are both good heat conductors and good electrical conductors because of the

similarity between thermal and electrical conductive properties

### It is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. Knowledge of Newton's law of cooling

supports this common knowledge

### We are warmed by condensation because water molecules in the air that strike our bodies

transfer some of their kinetic energy to us

wet

100 calories

### 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

273 degrees Celsius

### The greater the difference in temperature between the input reservoir and the output reservoir for a heat engine, the

greater the efficiency

100 degrees C.

### The vibrations of a longitudinal wave move in a direction

along the direction of wave travel

out of step

### compressions and refractions normally travel in

the same direction in a wave

speed

### On some days, air nearest the ground is colder than air that is higher up. On one of these days, sound waves

tend to be refracted downward

Example: