The set of nuclear reactions that power our sun can be summarized a 4p+ ? 4He+2 + 2e+. The masses of the particles involved are 938.272 MeV/c2 (proton, p+), 3727.38 MeV/c2 (alpha particle, 4He+2), and 0.511 MeV/c2 (positron, e+)
How much energy is released by each set of these reactions?
A) 2790 MeV B) 279 MeV C) 24.69 MeV D) 28.3 MeV
C
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An astronaut on a strange new planet having no atmosphere finds that she can jump up to a maximum height of 27 m when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration of freely falling objects on the planet?
What will be an ideal response?
A temperature difference of 5 K is equal to
a. a difference of 9 on the Celsius scale. b. a difference of 9 on the Fahrenheit scale. c. a difference of 2.8 on the Rankine scale. d. a difference of .5 on the Fahrenheit scale. e. a difference of 2.8 on the Celsius scale.
A 26.0-N crate starting at rest slides down a rough 4.8-m-long ramp, inclined at 21.0° with the horizontal. 18 J of energy is lost to friction. What will be the speed of the crate at the bottom of the incline?
a. 27.1 m/s b. 5.81 m/s c. 6.36 m/s d. 4.49 m/s
When a pair of identical lamps are connected in parallel
A) voltage across each is the same. B) current in each is the same. C) power dissipated in each is the same. D) all of the above