Мальчик вышёл из школы и пошёл домой. первый километр пути он прошёл за 0,2 ч, а оставшиеся 2 км его подвёз на велосипеде друг, затратив на это 0,1 ч. с какой средней скоростью двишался мальчик?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation