Answer:
Explanation:
Given
mass of wheel m=13 kg
radius of wheel=1.8 m
N=469 rev/min

t=16 s
Angular deceleration in 16 s


Moment of Inertia 
Change in kinetic energy =Work done
Change in kinetic Energy

(a)Work done =50.79 kJ
(b)Average Power

Resultant force= (2*6^2)^(1/2)
=8.5m/s
answer is B.
The longest wavelength in the Molecule's absorption spectrum is 2250nm
An ignious rock's color is mainly determined by its silica content