A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with a speed V?
a. QVB toward the east
b. Zero
c. QVB toward the west
d. QVB upward
e. QVB toward the south
c
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A 20.0 kg mass is attached to the end of a 1.00 m steel rod with a 1.00 mm diameter. If the tensile modulus of steel is 
then the frequency of the simple harmonic motion of the mass is
A. 37.2 Hz. B. 30.4 Hz. C. 24.5 Hz. D. 20.1 Hz. E. 14.1 Hz.
The current drawn by a 1200-W toaster connected to 120 V is 10 A. The resistance of the toaster coils is
A) 6 ohms. B) 12 ohms. C) 18 ohms. D) none of the above
If the spectrum of a sunspot shows that it has a maximum intensity at 650 nm, what is the temperature of the sunspot?
a. 650 K b. 5000 K c. 1950 K d. 4500 K e. 10,000 K
In the nuclear fusion of four hydrogen nuclei to form a helium nucleus, the resultant helium nucleus
A) is more massive than the four hydrogen nuclei, the missing mass being converted into energy B) is radioactive, generating energy by ejected electrons from beta decay C) is less massive than the four hydrogen nuclei, the missing mass being converted into energy D) has exactly the same mass as the four hydrogen nuclei, the energy being generated by the helium nucleus rearranging itself by emitting a gamma ray