At a wedding reception, you notice a small boy, 25 kg running and sliding on a dance floor. If the coefficient of friction between the boy’s pants and the floor is 0.15, what is the frictional force of the sliding boy?

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.

By what primary heat transfer mechanism does the sun warm the earth?