Which of the following is an example of a lever? knife ramp pencil sharpener wheelbarrow

How Do you know if an object has change position

Rubber is which of the following? conductor electric field insulator electric charge

A ship sends a 1200 Hz sound wave down into the water, and detect the echo 3 seconds later. What would happen if that ship sent out a 600 Hz sound wave instead?

What are the 3 types of energy transfer

In a lunar eclipse how does the moon cover the sun if the moon smaller then the sun?

Why do some elements have symbols that don't use letters in the element's name?

How many (whole number of) 91 kg people can safely occupy an elevator that can hold a maximum mass of exactly 1 metric ton? A metric ton is 1.000 * 103 kg. Answer in units of people.

What are the two types of surface waves? How are they different and which one would cause more damage? Explain.

What causes a regular reflection?

43.278 kg - 28.1 g use significant figures rule