Sebuah mobil ditarik pada kecepatan konstan pada jalan miring menggunaksn tali baja pada C. Mobil mempunyai massa 1800kg dan pusat massanya pada G ( percepatan gravitasi 9,81 m/s² ) Roda bebas menggelinding sehingga rolling resistance diabaikan. Tentukan besar gaya T pada tali baja penarik pada C dan gaya reaksi pada roda depan dan belakang!

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 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?