Elementary Problem: What Strength is Needed to Lift Mass m to Height h?

[Petar Mali]

Homework Statement

What strenght do you need to put mass m in the height $$h$$?

Homework Equations

$$P=\frac{A}{t}$$

The Attempt at a Solution

$$A=mgh$$

so

$$P=\frac{mgh}{t}$$

Is that mean that your strenght is less if you take mass long in the height $$h$$?

 

[Dadface]

Yes,the bigger the time(t)the smaller the power(P).

 

[tiny-tim]

Hi Petar!

(write "itex" rather than "tex", and it won't keep starting a new line )

Yes, you need power (not strength) of mgh/t to raise a mass m through height h in time t …

so you need less power if you take longer

(and that's the corrrect English! )