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PtichkaEL [24]
3 years ago
10

A wagon is pulled at a speed of 0.40 meters/sec by a horse exerting an 1,800-newton horizontal force. what is the power of this

horse?
Physics
1 answer:
Alex787 [66]3 years ago
5 0
The answer is: 720W
The definition of Power is:P =L/t =→F⋅→s/t =→F⋅→s/t = →F⋅→v
The ⋅ in the last formulation designate a scalar product, well-defined by:
→v . →w = |v| |w| cos(ˆvw), the angle ˆvw is 0 because →F and →v are parallel, so the cosinus is 1.
So: P=1800N⋅ 0,40m/s=720W.
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