In DC motor, the split rings are made of

A) steel B) copper C) wood D) glass

The manufacturer of a 6 V dry-cell flashlight battery says that the battery will deliver 15 mA for 64 continuous hours. During that time the voltage will drop from 6 V to 4 V. Assume the drop in voltage is linear with time.

Psychological principles are

An object has a weight W when it is on the surface of a planet of radius R. What will be the gravitational force on the object after it has been moved to a distance of 4R from the center of the planet?

The radius of a conducting wire is doubled. What will be the ratio of its new specific resistance to the old one?

An 85kg man is jogging with a velocity of 2.6m/s to the north. nearby a 65kg person is skateboarding and traveling with a velocity of 3m/s north. which person has greater momentum show your calculations

Which of these would you include ina free body diagram for a bicycle-plus-rider taken together as the bicycle is being pedaled up the hill?

What are two possible uses of genetic engineering

How many joules are expended by a 70 kg man climbing up 6m of stairway? How much work is done if the climbing takes place on the surface of the moon? (Assume that the acceleration due to gravity on the moon's surface is 1.6 m/s2

A baseball flying through the air has kinetic energy because of its motion. true or false?

How many poles does Jupiter's magnetosphere have? a. 2 c. 8 b. 4 d. 9