The carbon in our bodies was formed in nuclear reactions in long-dead stars. How much energy was released when the right number of 4He nuclei combined to make 12C?
The mass of 4He is 3728.40 MeV/c2 and the mass of 12C is 11,177.93 MeV/c2.
A) 7.27 MeV
B) 372 MeV
C) 8.42 MeV
D) 2.11 MeV
A
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Consider point charges of +Q and +4Q, which are separated by 3 m. At what point, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic force acting on it would be zero?
A) 3/5 m from the +Q charge B) 1 m from the +Q charge C) 1 m from the +4 charge D) 3 m from the +4 charge E) There is no such point possible.
In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each flight rises 3.1 m. (1 hp = 746 W)
(a) What is her total change in potential energy? (b) What was the minimum average power (in watts) that she expended during the 22 s? (c) What horsepower motor would be required to generate the same power?
Atoms are held together by
A) the electrostatic force of attraction between the protons in the nucleus and the surrounding electrons B) the combined electrostatic force of attraction between the protons and neutrons in the nucleus and the surrounding electrons C) the force of gravitational attraction between the protons in the nucleus and the surrounding electrons D) the electrostatic force of attraction between the neutrons in the nucleus and the surrounding electrons
Current: When current is flowing in an ordinary metal wire, the magnitude of the average velocity of the electrons is closest to
A. 10 m/s. B. the speed of light. C. 1 mm/s. D. 1 km/s. E. 1 m/s.