Jose is spinning a glazed chocolate doughnut at the end of a piece of wire above his head. If the doughnut is travelling with a velocity of 3 m/s and the wire is 1.5 meters long, what is the centripetal acceleration of the doughnut?Immersive Reader (1 Point)

7.5 m/s^2

6.0 m/s^2

2.0 m/s^2

1.3 m/s^2

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

This is the number of complete movements of a wave per second.

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?