A crane lifts a 50 kg crate so that the crate's speed increases from 0 m/s to 5 m/s over a vertical distance of 10 m. what is the force the crane exerts on the crate?

15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.