An electron moves in a uniform magnetic field of 0.20 T, at 5.0 x 105 m/s. The magnetic force on it is a) 1.6 x 10-14 N b) 1.6 x 10-14 N [perpendicular to the velocity]
c) 1.6 x 10-14 N [perpendicular to the field] d) not enough information given

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

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?