7. A block of mass m is at reston a frictionless, horizontaltable placed in a laboratory on the surface of the Earth. An identical block is at rest on a frictionless, horizontal table placed on the surface of the
Moon. Let F be the net force necessary to give the Earth-bound block an acceleration of a across the
table. Given that g Moon is one-sixth of g Earth, the force necessary to give the Moon-bound block the
same acceleration a across the table is

falling water hydro = water .. spectcular places these plants are

attach the statements so i can answer : )

because if the tool that you are using is not balanced it there would be false mass.

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