A wagon is pulled at a speed of 0.40/s by a horse exerting 1,800 newton horizontal force. what is the power of the horse?

power=work x joules

work=force times distance

Question

A wagon is pulled at a speed of 0.40/s by a horse exerting 1,800 newton horizontal force. what is the power of the horse?


power=work x joules

work=force times distance

anonymous · Answer

cool thanks!

shane_b · Answer

What is " of 0.40/s " supposed to be?

anonymous · Answer

0.4 meters per second

anonymous · Answer

this is what it says on my homework sheet. im going in before class tomorrow- i will check then...

shane_b · Answer

<slaps forehead> 

Ok, here we go:

$$W=F*d$$$$P=\frac{W}{t}=\frac{F*d}{t}=1800N(\frac{0.4m}{1s})=720W$$

anonymous · Answer

great! why did you multiply it by 1800 N ?
0

shane_b · Answer

I just pulled the force out to the left to make it more clear...it's the same as:$$P=\frac{W}{t}=\frac{F*d}{t}=\frac{1800N*0.4m}{1s}=720W$$

anonymous · Answer

thank you so much :) mind doing one more?

shane_b · Answer

Maybe...let's see it first :)

anonymous · Answer

IF a small machine does 2500 joules of work to an object to move it a distance of 100 meters in 10 seconds, what is the force needed to do the work? What is the power of the machine doing the work?

shane_b · Answer

Maybe this will be clearer :)

$$2500J=N∗m=F(100m)$$$$F=25N$$
Can you do the second part?

anonymous · Answer

probably not... is it 250 watts? :P

shane_b · Answer

Yep :)

shane_b · Answer

Now you're an expert in Work and Power :P

anonymous · Answer

yay!thank you!

shane_b · Answer

no problem, good luck!