You accidentally dropped a 3.5 kg glass platter. Before it hit the floor, the motion was entirely

in the vertical direction. When it hit the floor,

it broke into three pieces and they all moved

out in the plane of the floor. Imagine a coor-

dinate system on the floor. Piece 1 had a

mass of 1.3 kg and it moved off with a velocity

of 1.8 m/s at an angle of 52˚ counterclockwise

from the positive x axis. Piece 2 with a mass

of 1.2 kg moved off with a velocity of 2.5 m/s

at an angle of 61˚ clockwise from the negative

x axis. Find the mass and the velocity of

piece 3.

An internally reversible refrigerator has a modified coefficient of performance accounting for realistic heat transfer processes of where qin is the refrigerator cooling rate, qout is the heat rejection rate, and is the power input. show that copm can be expressed in terms of the reservoir temperatures tc and th, the cold and hot thermal resistances rt,c and rt,h, and qin, as where rtot rt,c rt,h. also, show that the power input may be expressed as 1.39 a household refrigerator operates with cold- and hot-temperature reservoirs of tc 5 c and th 25 c, respectively. when new, the cold and hot side resistances are rc,n 0.05 k/w and rh,n 0.04 k/w, respectively. over time, dust accumulates on the refrigerator’s condenser coil, which is located behind the refrigerator, increasing the hot side resistance to rh,d 0.1 k/w. it is desired to have a refrigerator cooling rate of qin 750 w. using the results of problem 1.38, determine the modified coefficient of performance and the required power input w under (a) clean and (b) dusty coil conditions. internally reversible refrigerator qout qin w high-temperature reservoir low-temperature reservoir th th,i tc,i tc high-temperature side resistance low-temperature side resistance w qin th tc qinrtot tc qinrtot copm tc qinrtot th tc

You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when you are finished

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?