Plane A is flying at 350 mph in the northeast direction relative to the Earth. Plane B is flying at 460 mph in the north direction relative to the Earth. What is the direction of motion of Plane B as observed from Plane A?
a. 70.7° N of E
b. 49.3° N of W
c. 40.7° N of W
d. 19.3° N of W
e. 48.2° N of E
c
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Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2 . Which of the following relative values for radii and lengths would result in equal resistances?
a. r1 = r2 and L1 = 2L2 b. 2r1 = r2 and L1 = 2L2 c. r1 = r2 and 4L1 = L2 d. 2r1 = r2 and 4L1 = L2
On pages 3 the chapter notes Europeans were unaffected by smallpox compared to Native American cultures. Why were they unaffected?
What will be an ideal response?
If two objects are electrically attracted to each other,
A) both objects must be negatively charged. B) both objects must be positively charged. C) one object must be negatively charged and the other object must be positively charged. D) one of the objects could be electrically neutral. E) None of the above statements are absolutely true.
A class of pollutants formed at high temperatures (nearly complete combustion) in the presence of air is ______________
Fill in the blank(s) with correct word