A uniform plank weight equals 120 N and of 3 m length . The support at Y provides a force of 50 N , while the support at X provides a force of 40 N. The support at 0.75 m far from X. Find the supporting force ( in N translational equilibrium

Which type of wave can travel without a medium

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?

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?