Answers Crowley Credit Recovery Physics BUnit Test

Unit Test — Cumulative exam Answers

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Which changes in an electric motor will make the motor stronger? Select 3 options.

using a stronger permanent magnet

using a weaker permanent magnet

increasing current in the electromagnet

decreasing current in the electromagnet

increasing the distance between the magnets

decreasing the distance between the magnets

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At night, the demand for electricity supplied by a fission nuclear reactor decreases. How is the fission nuclear reaction controlled to avoid overproduction of electricity?

The temperature of the reactor is lowered because high temperature and pressure are needed.

The temperature of the reactor is raised because the reaction slows down at higher temperatures.

The exposure between the fuel rods and a neutron-absorbing material is increased.

The exposure between the fuel rods and a neutron-absorbing material is reduced.

Maria listed four important points about Einstein’s special theory of relativity.1) applies to any object moving more slowly than the speed of light2) applies to objects moving in a straight path3) describes the relationship between time and space4) applies to uniformly moving objects

Change the first point to “applies to objects moving almost at the speed of light.”

For point 2, include objects moving in a curved path.

For point 3, replace the word “space” with the word “motion.”

Change the fourth point to “applies to accelerating objects.”

A wave is produced in a Slinky as shown.What is the direction of the Slinky wire at Point P as the waves travel through this point?

A dot with a vector drawn right and a vector drawn left.

A dot vector drawn up and vector drawn down.

A dot with a vector drawn up to the right and a vector drawn down to the left.

A dot with a vector drawn up to the left and a vector drawn down to the right.

Which statements correctly compare the gravitational force with the electrical force? Check all that apply.

The gravitational force can be repulsive.

The gravitational force can be attractive.

The electrical force can be repulsive.

The electrical force can be attractive.

Any two objects experience a gravitational force between them.

Any two objects experience an electrical force between them.

Which changes will cause an increase in the magnetic field of a solenoid? Check all that apply.

using more wire loops

using fewer wire loops

using a larger current

using a smaller current

increasing the spacing between loops

decreasing the spacing between loops

Wave Y and wave Z are two types of electromagnetic waves traveling through a vacuum. Suppose the frequency of wave Y is about three times greater than the frequency of wave Z.

It is the same for each wave because the amount of energy transferred is constant in all types of electromagnetic waves.

Wave Y transfers about one-third the amount of energy as wave Z because energy and frequency have an inverse relationship.

Wave Y transfers about three times the amount of energy as wave Z because energy and frequency have a direct relationship.

It is zero for each wave because when waves travel through a vacuum, they do not transfer energy.

A guitar string is plucked. What best describes the formation and transmission of the sound wave?

The string vibrates the surrounding air, which produces a transverse wave.

The string vibrates the surrounding air, which produces a longitudinal wave.

The string produces a longitudinal wave that travels without a medium.

The string produces a transverse wave that travels without a medium.

The diagram shows a negative charge moving in a magnetic field.

right

left

into the screen

out of the screen

After hearing about an accident on his normal route, Mr. Gujral checks for alternate routes to get to work.

a series circuit because there is more than one path

a series circuit because there is only one path

a parallel circuit because there is more than one path

a parallel circuit because there is only one path

A pebble is dropped in a pond.

transverse, because the water molecules move up and down, which is parallel to the motion of the wave

transverse, because the water molecules move up and down, which is perpendicular to the motion of the wave

longitudinal, because the water molecules move up and down, which is parallel to the motion of the wave

longitudinal, because the water molecules move up and down, which is perpendicular to the motion of the wave

Two bar magnets are labeled A and B. The ends of each magnet are numbered 1 or 2, but the poles are not labeled. When A1 is brought near B1, the bars repel.

A1 is the north pole of a magnet, and B1 is the south pole of a magnet.

A1 is the north pole of a magnet, and B1 is the north pole of a magnet.

A1 and B1 are opposite poles, but there is not enough information to tell which ones.

A1 and B1 are like poles, but there is not enough information to tell whether they are north poles or south poles.

Four compasses are placed around a wire, as shown.The wire is then connected to a battery so that a current flows down the wire.How will the compasses point once the current is flowing?

A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, west.

A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, east.

A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing clockwise.

A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing counterclockwise.

The figure shows a sound wave as a function of time when the source is stationary with respect to the observer.

An illustration of a transverse wave and three crests and three troughs are labeled 1 s total.

An Illustration of a transverse wave that is taller than the previous. Three crests and three troughs are labeled 1 s total.

An Illustration of a transverse wave and four crests and four troughs are labeled 1 s total.

An Illustration of a transverse wave and seven crests and seven troughs are labeled 1 s total.

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Unit Test — Cumulative exam Answers

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