Question

Which of the following is the proper unit for measuring power?
A. Newton
B. Joules
C. Watts
D. Meter

Answer 1

Power is given as follows:\[P=\frac{ E }{ t }=\frac{ Joules }{ \sec }=\frac{ kg∙m ^{2} }{ \sec ^{3} }\]A Newton is given as follows:\[1 Newton=\frac{ kg∙m }{ \sec ^{2}}\]

Can you see the answer now?

Answer 2

so its Newton? @PsiSquared

Answer 3

@PsiSquared

Answer 4

No look at the units I gave for power (in terms of kg, m, sec). They are not the same as Newtons, are they? Also, it can't be Joules because power is defined as Joules per second. So, you're left with either Watts or meters.

Answer 5

I think its watts. I was doing some research, so i have a goo feeling its watts?

Answer 6

Yes, it is Watts.

Answer 7

Thanks a million!

Answer 8

You're welcome.

Answer 9

Can you help me with one more?

Answer 10

Ok.

Answer 11

Which of the following are needed to calculate power?
A. distance and force
B. work and distance
C. force and distance
D. work and time

Answer 12

I am leaning to A or B. But I have no idea really.

Answer 13

Ok. Power is the amount of energy expended per unit time. Work is, in one definition, defined as follows:\[W=\Delta KE=-\Delta PE\]where KE is kinetic energy; and PE is potential energy. So, energy is related to work and has the same units as work (Joules). Now, with that in hand and looking at equations I've presented so far for these two problems you've posted, what do you think the answer is?

Answer 14

so its D?

Answer 15

That's right.

Answer 16

Yay! thank you!