7. A stone is thrown horizontally with an initial speed of 10 m/s from a bridge. If air resis-
tance could be ignored, how long would it
take the stone to strike the water 80 m below
the bridge?
(A) 1 s
(B) 2 s
(C) 4s
(D) 6 s
(E) 8s

Which type of wave can travel without a medium

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?

An air standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes. 1-2 isentropic compression 100 kpa and 22°c to 600 kpa 2-3 v=constant heat addition to 1500 k 3-4 isentropic expansion to 100 kpa 4-1 p=constant heat rejection to initial state (a) show the cycle on p-v and t-s s (b) calculate the net work output per unit mass (409 kj/kg) (c) determine the thermal efficiency (47.9%)