Question

What is the formulae for Hp/Watts for lifting objects as in weightlifting?

Answer 1

to lift weight, you have to apply equal amount of weight to overcome gravity, and more force to move it,

let's say you lift x kg weight to y meter in t seconds, then power is
P = x*9.8*y/t ... convert it into Horse Power

Answer 2

\[Power = \frac{work}{\Delta time}=\frac{force * distance}{\Delta time}=\frac{mass * acceleration * distance}{\Delta time}\]
Using the metric system:
Distance will be the height the weights are lifted in meters.
Time will be in seconds.
Acceleration (due to gravity) will be ~9.8 m/s ^2

From the equations above, you can figure out the power output of a weightlifter knowing the total weight lifted, the height at which it is was lifted and the time it took to lift it. The result will be in watts (joules/second). From there you can convert it HP knowing that 1HP = 745.7W.