the speed v of a sound waves through medium may be assumed to depend on the density v the medium , (b) it's modulus of elasticity E which is the ratio of stress to strain . deduce by the method of dimensions, the formula for the speed of sound

Answer: fn = wcos50 = 38.89(9.81)(cos50) = 245.23 n

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Idon't get it? what do you mean by playing 17 hours on the wii