Why do nuclear reactions in a star occur only near its center?
What will be an ideal response?
High-speed collisions between atoms and subatomic particles are necessary to overcome the Coulomb barrier, and this means high temperature. The gas density must also be high so the number of collisions per second is large. Only near a star's center are these conditions right for nuclear reactions to occur.
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Two different masses have equal, non-zero kinetic energies. The momentum of the smaller mass is
A) smaller than the momentum of the larger mass. B) larger than momentum of the larger mass. C) equal to the momentum of the larger mass. D) zero. E) There is not enough information to answer the question.
A sound level of 80 dB has twenty times the amplitude of a 60 dB sound
a. True b. False Indicate whether the statement is true or false
Spectrographic analysis of light from a distant galaxy shows that the galaxy is receding from Earth at v = 0.384 c. Use Hubble's law with H = 17 km/s/106 lightyears to estimate the distance to the galaxy
a. 3.3 × 10^8 lightyears b. 6.8 × 10^9 lightyears c. 9.9 × 10^8 lightyears d. 2.2 × 10^9 lightyears e. 6.5 × 10^6 lightyears
When five equal positive charges are uniformly spaced along the x-axis, the force on the next to last charge on the right is directed
A) to the right. B) possibly in the negative y-direction. C) zero. D) possibly in the positive y-direction. E) to the left.