The drawing shows a version of the loop-the-loop trick for a small car. the radius of the loop r = 0.50 m. what is minimum initial speed ( v ) that the car needs to have in order to remain in contact with the circular track at all times?

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

Power can be defined as a. the distance over which work was done. b. how much work can be done in a given time. c. all the work in an given area. d. the energy required to do work.

Work = force × a. work b. energy c. distance d. momentum