Determine the smallest force the man must exert on the rope in order to move the 87-kg crate. Also, what is the angle θ at this moment? The coefficient of static friction between the crate and the floor is μs = 0.30

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface