Escape speed for a rocket is less from
A) Earth.
B) the Moon.
C) the Sun.
D) same for each
Answer: B
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Capacitors of values 1.0 F, 2.0 F, 3.0 F, and 6.0 F are connected in series across a 12 V power supply. Which capacitor has the greatest potential difference across it?
A. the 1.0 F capacitor B. the 2.0 F capacitor C. the 3.0 F capacitor D. the 6.0 F capacitor E. they all are equal
The difficulty of taking a photograph of an atom with light is
A) unwanted diffraction. B) that atoms are smaller than wavelengths of light. C) both of these D) neither of these
What is the unusual result of mass transfer in the Algol binary system?
A) a helium white dwarf B) a carbon white dwarf C) a black dwarf D) a red dwarf E) a brown dwarf
The figure shows a cross section of three parallel wires each carrying a current of 5.0 A out of the paper. If the distance R = 6.0 mm, what is the magnitude of the magnetic force on a 2.0-m length of any one of the wires?
a.
2.5 mN
b.
3.3 mN
c.
2.2 mN
d.
2.9 mN
e.
1.7 mN