Aspool of thin wire (with inner radius r = 0.45 m, outer radius r = 0.60 m, and moment of inertia icm = 0.8208 kg·m2) pivots on a shaft. the wire is pulled down by a mass m = 1.300 kg. after falling a distance d = 0.500 m, starting from rest, the mass has a speed of v = 63.1 cm/s. calculate the energy lost to friction during that time.

Explanation:

The energy lost can be model by the energy equation in potential and kinetic energy in each step of the motion

Given: ,,,,

Kinetic energy:

,

Energy lost :

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