(c) length / height of the plane
the mechanical advantage of an inclined plane can be determined using different variables. in this case, the geometry of the setup is relevant. the advantage is proportional to the length of the plane, and inversely proportional to the height: it is the ratio (length) / (height) of the plane. for example, given a desired, fixed height, a long inclined plane gives you a bigger mechanical advantage than a short inclined plane. in this example, pushing an object up the long plane will require a smaller force, than it would on the short plane.
strictly speaking, (d) would also "allow you to determine the mechanical advantage" because you could simply invert the ratio listed under (d). however, (c) is the best, direct, answer.
mass number of uranium 238 is sum of number of proton and neutrons in it
while atomic number is just number of protons
so total number of protons in it = 92
total number of neutrons in it = 238 - 92 = 146
mass of proton = 1.0073 amu
mass of neutron = 1.0087 amu
now for the calculation of mass of nuclei is given as
so option b is correct
because of the continnuity of quaternion energy.