Questions in the picture. 15 points. you.

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

Which transition by an electron will release the greatest amount of energy? oa ob oc od

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects