Trong nghiên cứu bản chất hạt của sóng điện từ người ta đã sử dụng ánh sáng có bước sóng tương ứng với  = 0,6 m. Hãy xác định: năng lượng

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

What is created when solids,liquids,an gases mix with one another

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong chain