Physical Science Exam 2

Force field that can both accelerate and change speed of an electron

Electric Field

Motion of molecules and atoms that most affects temperature

Translational

Heat is a thermal energy that flows from

Hot to cold

If same heat is added to both a 1 liter and a 2 liter container of water, the temperature change of the 1 liter container will be:

Twice

When air is compressed with a tire pump, the temperature of the compressed air:

Increases as work is done on it

San Francisco had milder winters than Washington D.C. due to water’s high:

Specific heat capacity

Temperature at bottom of Lake Tahoe, high in the mountains, is what temp?

4 degrees C

When gas in a container expands 3x its volume at constant temperature, the gas pressure:

Is one-third

When a gas in a container is squeezed to half volume at constant temp, the pressure:

Doubles

In terms of transferring heat, red-hot wooden coals:

conduct poorly

Convection currents in the air near a seashore are produced by

Unequal heating of land and water

Coffee is served at a restaurant before you are ready to drink it. To be hottest when you are ready to drink it, you should add cream:

Right away

Human activities that warm the Earth’s atmosphere are caused by energy

Consumption and production

When steaming-hot aluminum soda is quickly inverted in to a pan of water, the can is dramatically crushed due to a rapid increase in internal pressure caused by:

Condensation of the steam inside

Food is cooked faster in a pressure cooker due to its

higher temperature

As ice is changed to water, energy is:

Given to the ice

Steam burns are much more damaging than oiling water burns because steam

Releases more thermal energy

A negatively charged rod is brought near a metal can that rests on a wooden table. You touch the opposite side of the can momentarily. The can becomes

Positively charged

When distance between two charges is halved, the electric force between the charges

Quadruples

Two charged particles 1m apart exert a 1N force on each other. If magnitude of each charge is doubled, the force on each particle will be:

4N

The direction of an electric field is defined as the direction of force on

A positively charged particle

Which is more dangerous, touching a faulty 120V light or a Van de Graaff generator charged to 100,000V?

The light

The electric current in a copper wire is normally composed of

Electrons

Heat a copper wire and its electric resistance

Increases

The purpose of the third prong on a common plug of an appliance is

To connect the appliance to zero ground potential

When two light bulbs are connected in parallel to a battery, the electric resistance that the battery senses is

Less than the resistance of either bulb

If you break a bar magnet in half you’ll

Have two magnets

The ultimate source of all magnetism is

Moving electric charge

The magnetic field inside a current-carrying coil increases when

Current is increased, an iron core is inserted, and the number of loops in coil increases

An electron beam directed through a magnetic field

May experience a force, and may be deflected

If you drop a bar magnet in a vertical copper pipe it will fall slowly because

It includes a magnetic field in the pipe that resists motion of the magnet

A copper ring can be made to levitate about the extended bar of an electromagnet because the magnetic field induced in the ring

Opposes the field producing it

A mass suspended from a spring bobs up and down one complete cycle every 2s. Its period is:

2s

A wave of 60 vibrations per second travels 30m in 1s. Its frequency is

60 Hz

A skipper on a boat notices wave crests passing the anchor chain every 5s. The skipper estimates distance between crests is 15m. What is speed of water waves?

3m/s

Which of the following is not a transverse wave?

Sound

Source of all sounds is something that is

Vibrating

Double the frequency of sound and you also double its

Nothing (Not wavelength, amplitude, or speed)

Sound will be louder when a struck tuning fork is held

With its base against a tabletop

A standing wave can occur when

A wave reflects upon itself

Sound waves can interfere with one another so that no sound is produced (T/F)

True

Someone shakes a rope tied to a wall and produces a standing wave of one loop. The distance between them and the wall is

One-half a wavelength

The pitch of a musical sound is most related to

Frequency

Which have the longest wavelengths when traveling in a vacuum?

Radio waves

Refraction results from differences in light’s

Speed

Light is shone up at surface of smooth pond from underwater at 10 degree angle to the normal. Some light passes into air, some is reflected back into the water, which makes an angle to the normal of:

10 degrees

If you wish to spear a fish with a spear you should compensate for refraction and throw the spear:

Below the sighted fish

Which has the highest frequency?

Blue light

Colors seen on the cover of our paper-bound physical science textbook result from color

Subtraction

There is twice as much molecular kinetic energy in a 2 liter of boiling water as in a 1 liter. What will be the same for both?

Temperature

You heat up a half-cup of tea and the temp rises by 4 degrees. How much will temp rise with same amount of heat but on a full cup of tea?

2 degrees

The third law of thermodynamics has to do with

Absolute zero

When stringing telephone lines between poles in summer, it is best to allow lines to what?

Sag

If you hold a metal bar against a piece of ice, the other end will become cold. Does the cold flow from the ice to your hand?

No

Firewalker walking barefoot on hot wooden coals depends on wood’s what?

Poor conduction

When air expands rapidly, what happens to its temperature?

It cools

High temperature source radiates what kind of wavelengths?

Relatively short wavelengths

When testing for hotness of a clothes iron, what it is best to do?

Wet finger first, then touch iron briefly

When a charge is conserved, it means that charge can be what?

Only be transferred from one place to another

When a negatively charged balloon is placed against a non-conducting wall, negative charges in the wall are what?

Repelled by the balloon

According to Coulomb’s Law, a pair of charges that are placed twice as close to each other will experience forces how much stronger?

Four times as strong

Two resistors, one with twice the resistance of the other, are placed together in series across a battery. Which will be true of the current through them and the voltage across them?

Current the same, voltage twice as large across the larger resistance

Positively charged drop falls through electric field. To give the drop straight trajectory, magnetic fields should be established with field lines pointing what direction?

Out of the screen

Wave A has an amplitude of 6cm, and a wavelength of 10cm. Wave B has amplitude of 3cm and wavelength of 10cm. If the two are superimposed, the range of possible amplitudes for resulting waves would be what?

From 3cm to 9cm