The unit to express work is called Joule.
Answer:

Explanation:
0.2 rev/s = 0.2 rev/s * 2π rad/rev = 0.4π rad/s
Since the angular acceleration is assumed to be constant, and the wheel's angular speed is increasing from rest (0 rad/s) to 0.4π rad/s within 23.8s. Then the angular acceleration must be
The μs between the clock and floor is 650(M*g) and the μk between the clock and the floor is 560(M*g)
Explanation:
F = qvBsin(angle)
F = 1.6 x 10^-19 x 9.5 x 1.8 x Sin (90)
F = 273.6 x 10^-20N
a = F/M
M of a proton = 1.67 x 10^-27kg
a = 273.6 x 10^-20/1.67 x 10^-27
a = 1638323353.29m/s