Compared with the photons of light that shines on glass, the emerging photons are
A) the same photons.
B) different though identical.
C) a mixture of being the same and different.
Answer: B
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An H-R diagram for a globular cluster will show a horizontal branch—a line of stars above the main-sequence but to the left of the subgiants and red giants. Which of the following statements about these horizontal branch stars is true?
A) They have inert (non-burning) carbon cores. B) Their sole source of energy is hydrogen shell burning. C) They generate energy through both hydrogen fusion and helium fusion. D) In a particular star cluster, all horizontal branch stars have the same spectral type.
The gauge pressure inside a pressure cooker is 13 psi. What is the net force on the lid of the pressure cooker if the lid's area is 110 square inches?
A billiard ball is moving in the x direction at 40.0 cm/s and strikes another billiard ball moving in the y direction at 30.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. What is the change in kinetic energy of the system as a result of the collision?
a. 0 c. some negative value b. some positive value d. No answer above is correct.
What is the stored energy in a 1.5-mH coil carrying a current of 4.0 A?
a. 12 × 10^-3 J c. 8.0 × 10^-3 J b. 4.0 × 10^-3 J d. 2.0 × 10^-3 J