Question

19) A 22.0-kg mirror with a surface area of 1.0 m2 and a 98% reflectivity is bombarded by light of average intensity 770.0 W/m2 at an angle of 30.0° to the normal of its surface. If the light has a duration of 0.60 s, how much does the velocity of the mirror change during that time? (c = 3.00 × 108 m/s, uo = 41 * 10-7 T.m/A, €0 = 8.85 x 10-12 C2/N·m2)

Answer 1

# r= 0.98 a 0.02 -reflectivity absorbitivity. average force on mirror IA (1+r] = C F. = 770x1 [170-98] 8 3210 5.08X10 N F acceleration - a z F m 5.08x10-6 22 a -0.231X10 m/s2 1 acceleration along it to minor 0.231.210-6 cos (30) 0. 2x10-6 m/s2 a= as V-u z at AV 2 2x107x0.6 OV = 1.28107 ml -change in speed of the during minor durin this time,

# r= 0.98 a 0.02 -reflectivity absorbitivity. average force on mirror IA (1+r] = C F. = 770x1 [170-98] 8 3210 5.08X10 N F acceleration - a z F m 5.08x10-6 22 a -0.231X10 m/s2 1 acceleration along it to minor 0.231.210-6 cos (30) 0. 2x10-6 m/s2 a= as V-u z at AV 2 2x107x0.6 OV = 1.28107 ml -change in speed of the during minor durin this time,