Which of the following is an element?

a. salt

b. iron

c. nylon

d. sand

What happens when a wave hits a barrier with a single opening?

A skateboarder is standing at the top of a tall ramp waiting to begin a trip. The skateboarder has

What do you know about potential energy? And how do we use it?

If one object has a positive charge and another has a negative charge, the object will be ... A. Cancel B. Attract C. Mix D. Repel

Does hot water or cold water boil faster is that repeated observations using models are controlled experiments

A wheelbarrow is an example of what type of lever

Why is it necessary to evaluate an experiment

A positive charge Q1 = 34 nC is located at the origin. A negative charge Q2 = - 5.5 nC is located on the positive x-axis p = 15 cm from the origin. Calculate the location of x axis in cm where electric field is.

What scientific question does Isaac Asimov most clearly address with his story "Runaround"? A. Should robots be allowed to marry? B, should robots be treated as members of the family? C. Can robots be trained to follow a moral code? D.

The force generated by a single muscle fiber can be increased by increasing is called