A dc motor uses what to move wires

A. Differences in electric resistance

B. static electricity

C. An electromagnetic field

D. Flowing protons

If a crane worker lifts a crate with a mass of 200 kg from the ground to a shipping container that is 45 meters off the ground, by how much has the worker increased the gravitational potential energy of the crate? (Recall that g = 9.8 m/s2) A.

Define Dissociation and Ionization?

A boy suddenly comes and sits on a circular rotating table. What will remain conserved? a. linear momentum b. kinetic energy c. angular momentum d. potential energy

Select a hot water setting for washing all white cottons and a warm water setting for permanent press or colored fabrics true or false

In each of the four situations described below, something is being heated. in which case is the heating caused by radiation? a. a heat lamp keeps a hamburger warm. b. cooking an egg in a skillet. c. hot air pouring from a heat vent. d.

Which of these is a mixture? calcium carbon dioxide salt water potassium

A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

What does it mean when we say science is a cycle?

1) Which is a characteristic of a metal? A) It looks dull. B) It feels brittle. C) It is a good insulator. D) It is a good conductor of electricity. 2)

1:a boy 2 a girl pulling a heavy crate at the same time w/10 unite of force each. What is the net force acting on the object