Question

A .337

B 2.76

C 3.31

D 1.68

E 1.04

F 2.28

Trebuchets are widely recognized to be the superior siege engine. During the launching process a 90 kg stone begins on the ground and leaves the trebuchet 15.0 m above the ground moving at a speed of 35.0 m/s. If an average power of 30 kilowatts is exerted on the stone during the launch, how long is the launch in seconds? (Consider the force to always be in the direction of the stone's motion such that W=Fd)

Answer 1

Mass, Migo 30 kg h 15m, Indial speed, U-omie fonal Speed, y= 35 mk. Trebuchets is equal to Total work done by increase total mechanical energy W = might & Mv2 raghi & mu? W = (90X9.8 X 15 + *x90x352-0-001 W= 68355 J 31+ $ Р Average power, Pa 68355 = t- t= 20X1000 t-2-2785$ t=20284 ņ > .: Correct option is F) 2.28 $