The RR Lyrae stars all have periods of:
A) less than a second.
B) several minutes.
C) several hours.
D) several days.
E) several weeks.
C
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Estimation: A reasonable estimate for the mass of a typical new-born baby is
A. 1 kg. B. 3 kg. C. 10 kg. D. 20 kg.
There is a superforce that separates into the electromagnetic, weak, and strong nuclear forces below a critical temperature
Indicate whether the statement is true or false
Four wave functions are given below. I. y(x, t) = 5sin(4x – 20t + 4) II. y(x, t) = 5sin(3x – 12t + 5) III. y(x, t) = 5cos(4x + 24t + 6) IV. y(x, t) = 14cos(2x – 8t + 3) Use this exhibit to answer the following question(s). Rank the wave functions in order of the magnitude of the frequencies of the waves, from least to greatest
a. IV, II, I, III b. IV = II, I, III c. III, I, II, IV d. IV, I, II, III e. III, IV, II, I
The figure shows a cross section of three parallel wires each carrying a current of 24 A. The currents in wires B and C are out of the paper, while that in wire A is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 4.0-m length of wire A?
a.
15 mN
b.
77 mN
c.
59 mN
d.
12 mN
e.
32 mN