Rubbing your hands against each other can make them hot. the faster you rub, the hotter they are. which of the following statements is/are correct? (1)the molecules of the hands have zero total kinetic energy because they vibrate about fixed positions. (2)the work done against friction between the hands is converted into the internal energy of the hands. (3)the temperature of the hands is directly proporti9nal to the kinetic energy of the hands.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Gather reliable information to brent make his decision. to gather this information, use newspapers, call insurance companies or look at their web sites, and review consumer magazines and web sites. also, look at the manufacturer web site or for information about gas mileage. list the sources you use and take notes.

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?