Author Question: As the angle of incidence is decreased for a ray incident on a reflecting surface, the angle between ... (Read 62 times)

student77 · **on:** Jul 28, 2018

As the angle of incidence is decreased for a ray incident on a reflecting surface, the angle between the incident and reflected rays ultimately approaches what value?
a. 90
c. 45
b. 180
d. zero

Question 2

An inventor develops a stationary cycling device by which an individual, while pedaling, can convert all of the energy expended into heat for warming water. How much mechanical energy is required to increase the temperature of 300 g of water (enough for 1 cup of coffee) from 30C to 90C? (1 cal = 4.186 J, the specific heat of water is 4186 J/kg C)
a. 94,000 J
c. 5400 J
b. 75,000 J
d. 14 J