3. Why did Cavendish use a telescope to observe the deflection of the rod?

He needed a way to magnify the rod.

He needed a way to make the rod look smaller.

He needed a way to observe the rod from a distance.

He needed a way to move the rod.

4. Magnetism was another potential source of error. The source of the magnetic field Cavendish
was concerned about was-

the enclosure around his apparatus.

Earth.

the metal balls and rods.

The air currents.

5. What did Cavendish discover with respect to the temperature of the balls in his experiment?

It had no effect.

It could be a source of error.

It was better to use balls at many different temperatures.

It was better to freeze balls before using them.

6. Experiments exploring sources of error-

were performed only by scientists working before 2000.

have been performed only by contemporary scientists.

are considered unimportant with modern instruments.

are important for most scientific studies.

For a particular scientific experiment, it is important to becompletely isolated from any magnetic field, including the earth'sfield. A 1.20 -diameter current loop with 200 turns of wire is setup so that the field at the center is exactly equal to the earth'sfield in magnitude but opposite in direction.

What is the current in the current loop?

For a particular scientific experiment, it is important to be completely isolated from any magnetic field, including the earth's field. The earth's field is approximately 50 uT, but at any particular location, it may be a bit more or less than this. A 1.00-m-diameter current loop with 200 turns of wire is adjusted to carry a current of 0.215 A; the coil's field at the center is exactly equal to the earth's field in magnitude but opposite in direction so that the total field at the center of the coil is zero. What is the strength of the earth's magnetic field at this location?

A manufacturer of automatic car transmissions uses steel gears. An important characteristic of these geras is their hardness. An experiment is conducted to compare gears made from three different steel alloys, that is, three is, three different compositions of steel. Gears made from each of these steel alloys were heat-treated or hardened at two different temperature levels, and . Twelve gears of each of the three different steel alloys were available--six were randomly assigned to each of the two temperature levels. For this experimental situation:

1. How many different treatment combinations will there be?

2. Create the design table and how many total experiment units will be needed for this experiment?