Why is Mercury's magnetic field so weak, relative to Earth's?
A. Mercury's rotation is too slow to generate a strong field.
B. Mercury has a solid core that cannot sustain a strong field.
C. Mercury has a very small iron core that cannot sustain a strong field.
D. Mercury's dayside temperature is too high for a strong field to form.
Answer: A
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If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the time it takes to reach the top of its path is
A) 1 s. B) 2 s. C) 10 s. D) not enough information
At what frequency will the inductive reactance of a 44-mH inductor be equal to the capacitive reactance of a 27-pF capacitor?
What will be an ideal response?
Velocity Addition: Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from him in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Gamma moving?
A. 0.70c B. 1.4c C. 0.82c D. 0.94c E. 0.98c
Which of the following statements is incorrect?
a.
Capacitance is always positive.
b.
The symbol for potential difference between the plates of a capacitor is 
.
c.
Water is a polar molecule.
d.
When a dielectric is placed in a capacitor it serves to reduce the electric field.
e.
Nonpolar molecules cannot be used for dielectric material in a capacitor.