Physics, 19.12.2019 02:31, MIStatefan2003
The momentum of light, as it is for particles, is exactly reversed when a photon is reflected straight back from a mirror, assuming negligible recoil of the mirror. the change in momentum is twice the photon’s incident momentum, as it is for the particles. suppose that a beam of light has an intensity 1.0kw/m2 and falls on a −2.0−m2 area of a mirror and reflects from it.
(a) calculate the energy reflected in 1.00 s.
(b) what is the momentum imparted to the mirror?
(c) use newton’s second law to find the force on the mirror.
(d) does the assumption of no-recoil for the mirror seem reasonable?
Answers: 1
Physics, 22.06.2019 22:30, nickocasamplonp6mlob
The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.
Answers: 2
Physics, 23.06.2019 05:10, richardharding
For those who need theses answers i just took the test and got everyone of them
Answers: 3
The momentum of light, as it is for particles, is exactly reversed when a photon is reflected straig...
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