A horse pulls a cart horizontally with a force of 60lb at an angle of 30o above the horizontal and moves along at a speed of 8mile per hour. How much does the horse do in 15minutes and what is the power of output of the (1hp = 550ft-lb/s), (1mile = 5280ft).

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m

the answer is the index of refraction of the second medium is higher. i just took the test.