The sun creates its energy by the process of
a. nuclear fission.
b. nuclear fusion.
c. convection.
d. conduction.
e. radiation.
B
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In the context of life in the universe, which of the following discoveries of astronomy suggests that the processes that formed life on Earth could have occurred elsewhere?
A) the universe is very old B) the laws of physics are the same everywhere C) the universe is very large D) the chemical elements that make up life on Earth are common
The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is the youngest?
A) The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. B) The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs. C) The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. D) The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants.
Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT b. 10 mT c. 8.0 mT d. 1.6 mT e. 7.2 mT
A proton and an antiproton each with total energy of 400 GeV collide head-on. What is the total energy (particles + energy) released?
a. zero b. 400 Gev c. 800 GeV d. 1 600 GeV e. 2 400 GeV