1. a rope attaches a tire to an overhanging tree limb. a girl swinging on the tire has a
centripetal acceleration of 3.0 m/s2. if the length of the rope is 2.1 m, what is the girl's
tangential speed?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?