8. Mikhail lifts a 500-newton weight 2 meters in 2 seconds. Tobias lifts the same 500-newton weight 2 meters in 4 seconds.
a. Which boy does more work?
b. Which boy uses greater power?
c. The human body is only 8 percent efficient. To obtain the
amount of work accomplished by Mikhail or Tobias, how
much input work was required

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?