Which of the following is not a unit of work?
A) Kg-m/s
B) J
C) Kw-h
D) N-m
E) W-s
A
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The graphs below show a voltage phasor at different instances of time. Which voltage phasor shows the instantaneous value of the voltage with the largest magnitude?
a.
b.
c.
d.
A typical, neutrally charged atom has
A. as many electrons as protons and neutrons combined. B. just as many electrons as protons. C. no neutrons in the nucleus. D. at least 1 neutron. E. more protons than electrons.
Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters in the same time. The power expended in raising the 50-kg sack is
A) twice as much as the 25-kg sack. B) half as much as the 25-kg sack. C) the same. D) need more information
The energy of the ground state in the Bohr model of the hydrogen atom is -13.6 eV. The energy of the n = 2 state of hydrogen in this model is closest to
A) -4.5 eV. B) -6.8 eV. C) -1.7 eV. D) -13.6 eV. E) -3.4 eV.