Why does the screw have a very low efficiency?

(-A-)Because with a low effort it can lift large loads.
(-B-)Because it take a huge effort to turn in order to lift large loads.
(-C-)Because the input work is much greater than the output work.
(-D-)Because the input work is much smaller than the output work.

The C for anyone who needs it

6/12=1/2

step-by-step explanation:

inverse v=i*r

nice nice

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