To push a 5-kg crate up a frictionless incline angled at 40° to the horizontal, a worker exerts a force of 150 N parallel to the incline. The crate moves a distance of 10 m, (use g = 10 m/s2). 1. What work is done on the crate by the worker? (In Joules)
2. What work is done on the crate by gravity? (Joules)
3. What is the work done on the crate due to the normal force of the inclined plane surface? (Joules)
4. What is the net work done on the crate? (Joules)
5. If the crate begins at rest, what is the final speed of the crate as it is moved from the bottom to the top of the inclined plane? (m/s)

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

What happens when a rubber rod is rubbed with a piece of fur?