Two students are arguing over the size of the net force acting on a 450kg box when a person pulls it at a constant speed of 7.1m/s across the level ground. James says that the applied force from the person is greater than the friction force but Tony says that the two are equal. Explain who you think is right and use physics equations to support the argument. Thanks in advance!

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

When you turn on a battery-operated device, an electrical circuit is

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