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.
Explanation: HIV is a viruse that only shows symptoms after a few weeks. in Fact HIV does not show any physical symptoms. So, no you can not tell if someone has or is been infected by HIV by directly looking at them.
