Solving Power Equation: Melting an Ice Cube

[dolpho]

Power Equation??

Homework Statement

An ice cube is placed in a microwave oven. Suppose the oven delivers 135 W of power to the ice cube and that it takes 33200 Joules to melt it. How long does it take for the ice cube to melt?

Homework Equations

P = W / T

The Attempt at a Solution

Ok so I know the answer but this is confusing me... A unit of Power is J/second. So if we rearrange the equation and solve for T in minutes it would be.

T = W / P,

T = 135 / 33200 which doesn't give us the right equation to solve it...

Instead it would be 33200 / 135 / 60 = 4.1 minutes, But why when I rearrange the equation doesn't it make sense?

 

[lewando]

33200 of what units? Badly stated question. "135 of power"?

P = W/T ? What do you think P and W represent?

 

[dolpho]

33200 of what units? Badly stated question. "135 of power"?

P = W/T ? What do you think P and W represent?

Power = Watts / Time, Fixed my typo up above.

Ugh nvm I just went full retard. I read the question wrong. Ty anyway!

 

[lewando]

Use power = work (or energy) / time. Power has units of Watts.

 

[dolpho]

Use power = work (or energy) / time. Power has units of Watts.

Yea that's what confused me... I mixed up watts and work. Ty!