CFC, Freon, and aerosols are becoming less commonly used because they

A) cause acid rain.

B) harm the ozone layer.

C) have radioactive waste.

D) cause Alzheimer's disease.

Which fundamental forces have an infinity range?

In a real machine, the work output is always less than the work input. a. True b. False

Read the sentence. Hakeem will assemble his new computer desk last weekend. Which verb or verb phrase corrects the error in the sentence? O assembles O has assembled assembled O is assembling

Most metals are not? A ductile B good conductors if heat and electric C liquid at room temperature D mellable

Explain how the formation of an undertow differs from the formation of a longshore current.

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.