The Sun is a slightly variable star. What if the surface temperature of the Sun were to increase from 6 000 K to 6 100 K, what would be the increase in total power radiated assuming no other changes such as radius or emissivity?
a. 1.6% b. 6.8%
c. 3.4% d. 14%
b
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At the maximum height of a projectile launched at an angle to the horizontal, the projectile's velocity is in a ______________ direction
Fill in the blank(s) with correct word
One type of medical imaging process is called positron emission tomography. Radioactive material is injected into a patient; during the radioactive decay the material emits a positron, which then interacts with an atomic electron, emitting gamma rays, which are detected by the imager. This gamma ray emission process is called:
A) pair production B) annihilation C) absorption D) alpha decay E) fission
A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is
A) equal to its weight. B) equal to its weight divided by its mass. C) equal to its mass times its weight. D) none of the above
In an AC series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle?
a. 180° c. 90° b. zero d. 45°