To lift a load to roof, you apply 21 n of force to a pulley. the pulley applies 21 n of force to the load. what is the mechanical advantage of the pulley?

Box 2 is pulled up a rough incline by box 1 in an arrangement as shown in the figure below. how many distinct forces are doing work on box 2?

The small particles that produce a streak of light upon entering earth's atmosphere are called

Which car is harder to stop and why? Calculate the momentum of cars A and B, and then answer the question Car A: Mass: 1,000 kilograms Velocity: 40 meters/second Car B: Mass: 4,000 kilograms Velocity: 10 meters/second

how much horsepower is required to lift a mass of 64 kilograms through a height if 10 meters in 3 seconds

Diana would like to observe the movements of a paramecium. Which of the following tools would be best for Diana to use? A. hand lens B. light microscope C. scanning electron microscope D. convex telescope

What element has the lowest electronegavity?

Identify two different ways you can make a yellow spotlight for a theater stage

Ian walks 2 km to his best friend's house, then walks 0.5 km to the library. He then makes a 2.5 km walk home. The entire walk took him 3 hours. What is his average speed in km/h? SHOW YOUR WORK!

What would happen if earth gravity suddenly disappeared?

How many layers of material were the roads made of? a. two c. four b. three d. five