Aceiling fan consists of five blades of 0.80 m length and 0.10 m width, which rotate at 100 rpm. estimate the torque needed to overcome the friction on the blades if they act as flat plates. (hint: at each location r along the length of the plate, the approach velocity will be 2πn×y where 0 < y < l and l is the blade length (0.8 m) and n is the rotational speed (rpm).

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is 100) a) static friction. b) kinetic friction. c) a combination of static and kinetic friction. d) neither static nor kinetic friction, but some other type of friction. e) it is impossible to tell what type of friction acts in this situation.

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].