What is a black body?
What will be an ideal response?
A black body is one which has surfaces that allow all potential photons or
packets of electromagnetic radiation to radiate orthogonally out from the
surface in a diffuse manner. It also allows all photons that arrive at the surface
to enter the body in an orthogonal fashion.
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A gas maintains constant temperature, but experiences both a change in its pressure and in its volume. What happens to its internal energy?
1.The internal energy decreases. 2.The internal energy increases. 3.The internal energy remains constant. 4.It cannot be determined whether it will increase, decrease, or remain the same.
A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is
A) zero. B) 1 m/s2. C) 10 m/s2. D) none of the above
Find the orbital speed of an ice cube in the rings of Saturn. The mass of Saturn is 5.68 x 1026 kg, and use an orbital radius of 1.00 x 105 km. (G = 6.67 × 10-11 N ? m2/kg2 )
A) 19.5 km/s B) 27.5 km/s C) 13.8 km/s D) 9.40 km/s
A flux of 4.0 × 10-5 T ? m2 is maintained through a coil of area 7.5 cm2 for 0.50 s. What emf is induced in this coil during this time by this flux?
A) 8.0 × 10-5 V B) 4.0 × 10-5 V C) 3.0 × 10-5 V D) 2.0 × 10-5 V E) No emf is induced in this coil.