một quả bóng nảy theo phương vuông góc ra khỏi mặt nghiêng Ф= 30° với vận tốc va= 37m/s. xác định khoảng cách R từ vị trí A tới vị trí nó đập vào mặ nghiêng B

Afixed electric space heater wired by a cable with an ampacity of 30 a should draw a maximum current of a. 30 a. b. 24 a. c. 15 a. d. 27 a.

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?