- An experienced pilot can keep an engineless glider aircraft aloft for hours by using only the lift provided by rising air currents. Suppose during a flight an
upward force of 5.00 103 N is exerted on the glider. Simultaneously, the
glider experiences a forward force of 0.50 103 N. The gravitational force
acting on the glider and its pilot is 4.80 10N. Draw a free-body diagram of
the glider.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

The least penetrating form of radiation is

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.