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In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of
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
When weight is applied to the top of a stone arch, all of the stone blocks in the arch undergo
When a load is placed on the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes
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
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
The energy source responsible for the motion of molecules that make up the atmosphere is
As a high-altitude balloon sinks lower and lower into the atmosphere, it undergoes a decrease in
A temperature difference of 10 degrees Celsius is also equal to a temperature difference of 10 on the
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
Fourier discovered that periodic waves can be represented by
the summation of a series of simple sine waves
Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a new born are
the same age
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
Two vertical tubes equal cross-sectional areas are filled with water and mercury. If water is filled to a depth of 10.3m and mercury to a depth of 0.76m, both liquids have equal
The depth which the inverted drinking glass must be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half is
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
Consider a closed, sealed can of air placed on a hot stove. The contained air undergoes an increase in
two of these
Suppose you want to save energy and you're going to leave your warm house for half an hour on a cold day. You should turn the thermostat
Suppose the temperature of the input reservoir in a heat engine doesn't change. As the sink temperature is lowered, the efficiency of the engine
Vibrations of a longitudinal wave move in a direction
at right angles to the direction of wave travel
You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves
The fundamental frequency of a violin string is 440 hertz. The frequency of its second harmonic is
Which of the following statements is true?
There are only about 100 different kinds of atoms that combine to form all substances
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
In a closed bottle are a certain number of hydrogen molecules. In an identical closed bottle at the same temperature and internal pressure are a certain number of nitrogen molecules. The bottle with the greatest number of molecules is the one containing
both the same
Suppose all sized potatoes are selling at the same price per kilogram. If you peel them for mashing, you will get more potato for your money if you buy
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
A very light-weight horizontal loop of wire is suspended from a spring, lowered into water, and then raised to the surface. Any further attempt to raise it causes the spring to
What is the approximate mass of a 1-square centimeter column of air that extends from sea level to the top of the atmosphere?
As a woman holding her breath swims deeper and deeper beneath the water's surface, her density
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
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
Suppose you walk on red-hot coals with bare feet. If bits of the coals do not stick to your feet, it would be best if your feet are
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
Consider a cup of tea at room temperature, 24 degrees C. If it is heated until it has twice the internal energy, unlike a piece of metal, its temperature will be
100 degrees C.
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