Physics

The lowest possible temperature in nature is...

-273 degrees C

A weight on the end of the spring bobs up and down one complete cycle every 4 seconds. Its frequency is...

0.25 hertz

680-Hz sound wave travels at 340m/s in air, with a wavelength of....

0.5 m

A certain ocean wave has a frequency of 0.07 hertz and a wavelength of 10m. What is the wave's speed?

0.7 m/s

Which would burn the most: 100g of water at 100 degrees C, 100g of steam at 100 degrees C, or both?

100 degrees of steam

An object dropped from rest almost infinitely far from earth falls to earth because of earth's gravitational field, and strikes the surface with a speed of about...

11 km/s

Escape speed from the surface of earth is about...

11.2 km/s

The number of calories released when 3g of 100 degree C steam cools to become 3g of 0 degree ice is...

2160 calories

A 2-C charge and a 4-C charge attract each other with 10 N of force. How much will a 2-C charge and a 12-C charge attract each other when placed the same distance apart?

30N

If the radius of earth was 1/2 of what it is now, and the mass were the same, what would be the value of g?

39.2 m/s^2

When an 8-V battery is connected to a resistor, 2 A of current flows in the resistor. What is the resistor's value?

4 ohms

A skipper on a boat notices wave crests passing the anchor chain every 6 seconds. The skipper estimates the distance between crests at 30m. What is the speed of the water waves?

5 m/s

How much power is used by a 12-V car battery that draws 0.5A of current?

6 W

A cork floating in a pool oscillates up and down 3 complete cycles every 1 second as a wave passes by. The wave's wavelength is 2 m. What is the wave's speed?

6m/s

The orbital speed for a satellite orbiting very close to earth's surface is...

8000 m/s

When a wrench is slid spinning over a frictionless tabletop, its center of gravity follows...

A regular straight line path

What happens when an airplane is flying faster than the speed of sound?

A shock wave is produced

A satellite near earth makes a full circle in about an hour and a half. How long would it take a satellite located as far away as the moon to orbit earth?

About 28 days

You are water-skiing on a lake, and being pulled by a noisy motorboat. Another motorboat is speeding through the water a bit ahead of your boat so that the rarefactions from its motor hit you when compressions from your boat's motor hit you. You hear...

Almost nothing due to destructive interference

A black hole is an object that...

Alters the space around it, has an enormous density, has an enormous gravitational field, and has an escape speed greater than the speed of light

If the north pole of one magnet is brought near the south pole of another magent, the poles will

Attract each other

Temperature is mostly related to the

Average molecular kinetic energy in a substance

In order to make an electromagnet, you need a...

Battery, some wire, and a nail

Since Earth is attracted to the sun, why doesnt it fall into the sun?

Because it has sufficient tangential velocity

If you take a shower in a steamy bathroom and then go to your bedroom to dry off, why will you feel colder in your bedroom?

Because water evaporates off your skin, and your skin will be cooled

Lightning bolts occur between....

Both clouds and clouds and the ground

A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. Which force is greater?

Both forces are the same

While jet-skiing on a lake, you look back and notice a V-shaped pattern made by overlapping wave crests. This pattern is known as a...

Bow wave

An object thrown into the air with a spin rotates about its...

Center of gravity

In order for there to be a flow of charge from one place to another, there must be a...

Conductor connecting the two places and potential difference between the two places

The first law of thermodynamics is a restatement of...

Conservation of energy

The speed of a satellite in a circular orbit is...

Constant

Electric power is defined as...

Current times voltage

Electric field lines between two oppositely charged parallel metal plates will be...

Curved lines griuoed together in small bunches

Stunt motorcyclist biker Bob rides his bike inside a futuristic rotating space station, a giant rotating donut shaped structure in space. The normal support force feels like weight to him. As he rides his bike in the opposite direction to the station's rotation, the normal force...

Decreases

When work is done by a system and no heat is added to it, the temperature of the system...

Decreases

Noise-cancelling earphones are an example of...

Destructive interference

A supplier wants to make a profit by buying metal by weight at one altitude and selling it at the same price per pound at another altitude. The supplier should...

Disregard altitude because it has a negligible effect

A bimetallic strip will bend when heated because...

Each metak expands at different rates

A lunar eclipse happens when...

Earth is between the moon and the sun

A volt is a unit of...

Electrical potential

A vertically oriented rocket that maintaines a continuous upward velocity of 8 km/s will....

Escape earth

During an eclipse of the sun, where the moon comes between the sun and the earth, the ocean tide nearest the moon would be....

Extra high

T or F: Ohm's law is a relationship amont voltage, current, and charge

False

T or F: a fuse or circuit breaker used in a circuit is usually inserted in a parallel

False

T or F: a good emitter of heat is also a good reflector of heat

False

T or F: a wave on a rope whose motion is at a right angles to the direction of wave propagation is a longitudinal wave

False

True or False: the three common phases of matter are mass, density, and volume

False

If you whirl a tin can on the end of a string and the string suddenly breaks, the can will...

Fly off, tangent to its circular path

Torque is defined as...

Force times lever arm

Magnetic field lines are conventionally drawn...

From north to south

Where is the center of gravity of a softball bat located?

In the more massive end of the bat

If the mass of the Earth increased, with no change in radius, your weight would...

Increase also

A small, positively charged object near a positively charged sphere is moved closer to the sphere. The electrical potential energy of the small object...

Increases

At high altitudes, the boiling point of water

Is lower

Jupiter has more than 300 times the mass of Earth. Yet on Jupiter's surface an object weighs only about 3 times as much as it would on Earth. The explanation to this involves Jupiter's...

Large radius

Compared to thin wires, electrical resistance in thick wires is...

Less

Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have...

Less resistance

Electrical potential energy is the energy a charged object has because of its...

Location

A sound wave is a...

Longitudinal wave

If an object is in unstable equilibrium, any displacement will...

Lower its center of gravity

A piece of metal will feel colder than a piece of wood at the same temperature. Why?

Metals, in general, are good heat conductors

Ceramic automobile engines that operarate at higher temperatures will be...

More efficient

When we move around through space just a little bit, we are moving...

Mostly through time and just a little through space

If a football is kicked so the force on the ball is through its center of gravity, the ball will...

Move without any tumbling or spinning

A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is 0. When a very massive spaceship lands on the planet's surface, the gravitational field inside the planet is...

Nonzero, directed toward the spaceship

Which pole of a compass needle points to a south pole of a magnet?

North pole

The common hydrogen atom consists of...

One proton and one electron

In order for tidal forces to be significant, there must be a relatively large distance between...

Opposite sides of the body experiencing tides

Permenant magnets can be made by...

Placing a piece of iron near a strong electromagnet, placing a piece of iron in a strong magnetic field, and stroking material containing iron with a magnet

A negatively charged rod is brought near a metal can that rests on a wood table. You touch the opposite side of the can momentarily with your finger. The can is then...

Positively charged

Charge carriers in a metal are electrons rather than protons, because electrons are...

Relatively far from a nucleus, loosely bound, and lighter

When a star collapses to form a black hole, its mass...

Remains the same

"Centrifugal forces" are an apparent reality to observers in a reference frame that is...

Rotating

When two light bulbs are connected in series, the...

Same amount of current always flows through each bulb

Compared to the speed of light, sound travels...

Slower

When resistors are put in parallel with each other their overall resistance is...

Smaller than the resistance of any of the resistors

T or F: An object will maintain its angular momentum unless acted on by an unbalanced force

Sometimes true

Which is not a transverse wave: light, radio wave, sound, all, none

Sound

To weigh less in the Northern Hemisphere, you should go...

South

The circular orbit of a satellite orbiting Earth is characterized by a constant...

Speed, radius, and magnitude of acceleration

A person weighs less at the equator than at the poles. The reason for this has to do with the...

Spin of the Earth

The force of gravity acting on you will increase if you...

Stand on a planet with a radius that is shrinking

According to the special theory of relativity, all laws of nature are the same in reference frames...

That move at constant speeds

Which produces a greater tidal effect on your body, the moon or a 1-kg melon that you hold above your head?

The melon

The Doppler effect is the change in observed frequency due to...

The motion of the source or observer

The effect of the sun's pull on earth's oceans is much less visible than that of the moon's pull because...

The sun is so far away

Newton's Law of cooling says that the rate of cooling says that the rate of cooling depends on...

The temperature difference between an object and its surroundings

Which is desner, ice at 0 degrees C or water at 4 degrees C?

The water

When you carry a heavy load with one arm, why do you tend to hold your free arm away from your body?

To change the weight of your body and the load

T or F: it is possible to totally convert a given amount of mechanical energy into heat

True

T or F: semiconductors can be made to conduct electricity and they can also be made to act like good insulators

True

T or F: systems left alone tend to move to a state of greater entropy

True

T or F: tennis balls are yellow-green because our eyes are most sensitive to that color

True

T or F: when steam changes into water at 100 degrees C, energy is released

True

Suppose the moon were covered with water and orbited earth as it now does. In that case the moon would have...

Two tidal bulges

When snow forms in clouds, the surrounding air

Warms

The reason fish live from year to year in ponds that freeze over in the winter is that...

Water below the ice is 4 degrees above freezing

During a very cold winter, water pipes sometimes burst. The reason for this is...

Water expands when freezing

Which, at the same temperature, will cool more slowly on a hot day? (Dry beans, watermelon, potatoes, bread)

Watermelon