Question 1 Group of answer choices The weight of an object depends on where the measurement takes place. In physics, which of the following is true? In mechanics, weight and mass measure the same...

Question 1
Group of answer choices
The weight of an object depends on where the measurement takes place.

In physics, which of the following is true?

1. In mechanics, weight and mass measure the same property of matter.


2. In mechanics, the kilogram is an acceptable unit of force, as long as it is used to describe weight.


3. Mass and weight are both vector quantities.

Question 2

10 pts

Identical cars A and B go around the same curve, with A traveling two times as fast as B. The centripetal force on A

Group of answer choices

1. is four times as large as the centripetal force on B.


2. is one-half as large as the centripetal force on B.


3. is one-fourth as large as the centripetal force on B.


4. is two times as large as the centripetal force on B.


5. is the same as that on B, because they are on the same curve and have the same mass

Question 3

10 pts

When a gas expands, its ______________ decreases.

Group of answer choices

1. temperature


2. volume


3. mass


4. electrical energy

Question 4

10 pts

When the speed at which an object is moving doubles,

Group of answer choices

1. the amount of its kinetic energy is 4 times what it was.


2. the amount of its kinetic energy is 2 times what it was.


3. the amount of its kinetic energy is not changed


4. the amount of its kinetic energy is one-fourth what it was.

Question 5

10 pts

A rubber boot is filled with water.  A hole is poked near the top of the boot and another hole is poked in the toe region of the boot. You notice that the stream of water coming out of the boot's toe has a higher velocity than the water stream coming out of the top hole in the boot. The holes have the same diameter. Why?

Group of answer choices

1. The water pressure is higher at the top of the boot.


2. The water pressure is higher at the toe of the boot.


3. The water pressure is the same throughout the boot.


4. The water pressure can not be determined in the boot.

Question 6

10 pts

Two iron workers stand 150 m apart. One strikes a steel beam with a hammer. How long does it take for the other to feel the sound through the beam? Assume that the speed of sound in steel is 5200 m/s.

Which of the following is the correct method to solving this problem?

Group of answer choices

1. multiply speed and distance


2. divide speed by distance


3. divide distance by speed


4. take the square root of speed, then multiply by distance

Question 7

10 pts

Which device converts electric energy into mechanical work?

Group of answer choices

1. the electric motor


2. the electric generator


3. the transformer


4. the rheostat

Question 8

10 pts

To find the force of attraction between point charges, you must use which of the following?

Group of answer choices

1. Ohm's Law


2. Ampere's Law


3. Faraday's Law


4. Coulomb's Law

Question 9

10 pts

An object placed 5 cm from a mirror forms an image 3 cm behind the mirror. Find the focal length of the mirror. In order to solve this problem, you must

Group of answer choices

1. make the image distance negative since it is behind the mirror.


2. make the image distance positive since it is behind the mirror.


3. make the object distance negative since it is behind the mirror.


4. make the object distance positive since it is behind the mirror.

Question 10

10 pts

Magnification is found by which of the following?

Group of answer choices

1. The object height divided by the image height.


2. The image height divided by the object height.


3. The positive of the image distance divided by the object distance.


4. The negative of the object distance divided by the image distance.