The speed of sound in air is about 340 mvs. What is the wavelength of sound waves produced by a guitar string vibrating at 500 Hz?

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

Since the pully is a simple machine so the mechanical advantage is a 1

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;

The independent variable in this experiment is the angle at which the light from the ray box strikes the mirror.hope this .