Donathan

And how?

The morning mood was beautiful and bright

But her mood was not

She was cold and bloody

Locked away in a freezer

Put there by her attacker

She has been there for an hour

The door to the freezer opens

She is filled with hope, but it is destroyed

Her attacker stands before her

She will not be cold anymore.

A transformer is connected to a 120 V input voltage. There are 341 turns of wire on the input coil. The output voltage is 6000 V. How many turns of wire are there on the output coil?

You put a magnet inside a coil of wire. Why is there not a current produced in the coil when the magnet is sitting in the wire?

a. The wire has to have low resistance for current to flow.

b. There has to be motion to cause current to flow.

c. The magnetic field inside the coil isn't changing.

d. The magnet has to be very strong to cause current to flow.

A magnet will apply a force to a copper wire when current flows through the wire, even though copper is not affected by magnets. What causes the force?

A transformer with a 120 V input voltage has 2000 turns of wire on the input coil and 78 turns of wire on the output coil. What is the output voltage?

Why won't a transformer work with a DC input voltage?

a. Transformers require more voltage than DC circuits can provide.

b. Transformers act like short circuits with DC power.

c. DC input voltage does not produce a changing magnetic field.

d. DC input voltage does not produce a magnetic field.

Which of these is not an example of the relationship between electricity and magnetism?

a. Electric fields exist around electric charges.

b. A changing magnetic field can produce an electric field.

c. A moving electric charge produces a magnetic field.

d. A magnetic field can apply a force to a moving electric charge

Two coils are connected to different power supplies. Each coil carries a current of 0.15 A. Coil A has 300 turns of wire. Coil B has 400 turns of wire. Which of these statements is correct?

a. Coil B produces a larger magnetic field because it has more turns.

b. Coil A produces a larger magnetic field because it has less resistance.

c. Coil A produces a larger magnetic field because it has fewer turns of wire.

d. Coil B produces a larger magnetic field because it has more resistance.

A transformer is connected to a 120 V input voltage. There are 341 turns of wire on the input coil. The output voltage is 6000 V. How many turns of wire are there on the output coil?

Two identical coils of wire are connected to different power supplies. The current in coil A is 0.50 A. The current in coil B is 0.25 A. Which coil produces the largest magnetic field?

a. Coil B produces the largest magnetic field because it has the largest resistance.

b. Coil A produces the largest magnetic field because it has the lowest resistance.

c. Coil A produces the largest magnetic field because it has the highest current.

d. Coil B produces the largest magnetic field because it has the lowest current.

How much energy is required to increase the temperature of 0.25 kg of copper from 20 Celsius to 90 Celsius?

An aluminum rod is 2.0 m long when it is at 20 °C. How long is it when it is at 38 °C? Round your answer to 5 decimal places.

During an experiment, a sealed container of air is placed in a refrigerator. 23.0 J of heat are removed from the container by the refrigerator. What is the change in internal energy of the air in the container?

A steel beam is 50 m long at a temperature of 25 °C. How much will the length change if the temperature increases to 50 °C? Round your answer to three significant digits (not three decimal places!).

An aluminum rod is 2.0 m long when it is at 20 °C. How long is it when it is at 42 °C? Round your answer to 5 decimal places?

A 0.1 kg piece of aluminum is heated from 20 oC to 41 oC. How much heat was required?

A 0.89 piece of copper is heated from 20 °C to 57 °C. How much heat is required?

A graduate student leaves a cylinder of carbon dioxide sitting in the sun. The cylinder absorbs 22.7 J of energy while sitting in the sun. A piston in the cylinder moves upward. The carbon dioxide did 12 J of work on the piston to move it upward. Find the change in internal energy of the carbon dioxide.