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Physics question not looking for the quick answer but need to know how to solve please help?
Not looking for just the quick answer but need to know how to solve this any help is appreciated
A soldier has a huge contraption that notches a large 2kg arrow in a massive bow and uses a winch system to draw the arrow back to set the bow. The soldier does 128 J of work in the process setting the bow/arrow combination and then releases the arrow. What is the speed of the arrow?
2 Answers
- Lee Wang TuiLv 71 decade agoFavorite Answer
Ideally all the work will be converted into kinetic energy.
W = 1/2 m V^2
128 (J)= 1/2 2 (kg). V^2
V = (2.128)^0.5 . (J/kg)^0.5. [(kg.m^2/kg.s^2) ^0.5/(J/kg)^0.5]
V = 256 m/s
- Anonymous4 years ago
for this reason you -incredibly- could desire to get attentive to all of those nasty looking equations on your physics e book. Like this one: V^2 = Vo^2 -2ax the place V is on the spot speed, Vo is preliminary speed, a is acceleration and x is distance. because of fact the guy went a top of .ninety one meters and the Earths acceleration (gravity) is approximately 9.8 m/s/s. on the best of his bounce his on the spot velocity is 0. Now this is plug 'n play: 0 = Vo^2 - 2*9.8*.ninety one Vo^2 = 17.836 Vo = sgrt(17.836) = 4.22 m/s. right this is a pair greater: Ek = mv^2/2 and Ep = mgh. finished mechanical power is the sum of the flair and kinetic energies of a mass. bypass to it ? Doug
