Imagine a single charge q placed on one corner of a square, and that the electric field at the center of the square is F/q. If additional equal charges are placed on the other three corners,
the electric field at the center of the square due to these four equal charges is
A) F/q.
B) 4F/q.
C) F/(2q).
D) F/(4q).
E) none of the above
Answer: E
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The intensity of radiation reaching the Earth from the Sun is 1350 W/m2 . The Earth's radius is 6.4 × 10^6 m. How big a force does this radiation exert on the Earth? (Assume it is all absorbed.)
a. 5.8 × 10^8 N b. 1.2 × 10^9 N c. 2.3 × 10^9 N d. 4.6 × 10^9 N e. 1.7 × 10^17 N
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.
When a nucleus emits a beta particle, its atomic number
A) increases by 1. B) decreases by 1. C) increases by 2. D) decreases by 2. E) none of the above
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object’s velocity is zero in region(s)
a.
I.
b.
II.
c.
III.
d.
no regions