Hydroelectric power is a good source of heat energy.

a. true

b. false

Are electrons, protons, or neutrons the smallest particles? if not, what are

You are looking at four tall pea plants. What are their phenotypes and genotypes

A bag of sand has a density of 45 g/cm3 and a mass of 15 kg. How much space does the sand take up? A. 3 cm3 B. 675 g/cm3 C. 333 cm3

What is the worst form of marine pollution

The U. S. Navy has long proposed the construction of extremely low frequency (ELF waves) communications systems; such waves could penetrate the oceans to reach distant submarines.

If you are trying to balance a seesaw and you have a higher mass on the left, should the mass on the right be placed at a greater distance or lower distance to balance it? Why?

A car travels 300 km in the first 3 hours of a trip. Then it hits traffic and travels only 60 km during the last hour. What is the average speed of the car? a.) 180 km/h b.) 100 km/h c.) 90 km/h d.) 120 km/h

What is the purpose of using a wedge? A. separates objects B. keeps objects together C. allows you to exert force over a distance

Echolocation is an acoustic principle in which some wildlife use resonance to find food at night. Question 25 options: True False

Use the drop-down menus to identify the variables for the second hypothesis. Hypothesis #2: As you build circuits, you will alter resistance, which is the y variable.