Body is a uniform rigid disk that rotates about the fixed center . Body is a uniform thin rigid rod that connects pins and , and point is constrained to move in a slot. At the current instant we have:

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

the answer is b, have negligible mass

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft