A race car circles 10 times around a circular 8.0-km track in 20 min. Using SI units
(a) what is its average speed for the ten laps?
(b) what is its average velocity for the ten laps?
What will be an ideal response?
(a) 67 m/s (b) 0 m/s
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One can reverse the north and south poles of an electromagnet by reversing the direction of current flow through it
a. True b. False Indicate whether the statement is true or false
If an atom's atomic number is given by Z, its atomic mass by A, and its neutron number by N, which of the following is correct?
A) N = A + Z B) N = Z - A C) N = A - Z D) N = 2A + Z E) N = A + 2Z
Applications to Astronomy: About 1 ?s after the Big Bang, the temperature of the universe was about 1013 K. What particle kinetic energy (in eV) does this correspond to? (1 eV = 1.60 × 10-19 J, k = 1.38 × 10-23 J/K)
A. 1 keV B. 1 MeV C. 1 GeV D. 1 TeV
A negatively charged rubber rod is brought near the knob of a positively charged electroscope. The result is that:
A) electroscope leaves will move farther apart B) the rod will lose its charge C) electroscope leaves will tend to collapse D) electroscope will become discharged E) nothing noticeable will happen