WHOEVER ANSWERS GET 100 POINTS IF CORRECT AND BRAINIEST 1. If the work done by a ramp is 1430 Joules (J), and the work done by the effort force is 1650 J, what is the efficiency of the machine?

2. If the work done by a lever is 5675 J, and the work done by the effort force is 10 000 J, what is the efficiency of the machine?

3. The girl in this picture wants to raise a cart that weighs 350 N to a height of 4m. If she uses a ramp, she needs to pull the cart 10 m using a force of 160 N. If she lifts the cart without a ramp, she needs to exert a force of 350 N for 4 m. What is the efficiency of the ramp?

4. Why is a machine never 100 percent efficient? What could be done to increase the efficiency of the machine in question 3?