A boulder with a mass of 2,500 kg on a ledge 200 m above the ground falls. Estimate the speed of the boulder just before it hits the ground.

The Ptolemaic theory of the universe was disproved by a. Descartes. b. Kepler. c. Copernicus. d. Newton.

What are the four theories of the origin of the moon?

a 2000-kilogram car uses a breaking force of 12000 newton's to stop in 5 seconds. what impulse acts on the car?

Taja walks two miles north from her door to the park, then returns home to her door distance and displacement

Why is it easier to change meters to centimeters than it is changing yards to feet?

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.