A 30-kg girl on friction-free roller blades pushes away a 25-kg boy also on roller blades at 1 m/s. The girl's speed is
A) 0.45 m/s.
B) 0.55 m/s.
C) 0.83 m/s.
D) 1.2 m/s.
Answer: C
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Two 10¢ coins (dimes) carrying identical charges are lying 2.5 m apart on a table
If each of these coins experiences an electrostatic force of magnitude 2.0 N due to the other coin, how large is the charge on each coin? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) A) 2.6 ?C B) 26 ?C C) 6.7 ?C D) 5.2 ?C E) 52 ?C
Two things that are quantized in the Bohr model of the hydrogen atom are __________ and __________
Fill in the blank(s) with correct word
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 wavelengths, from least to greatest
a. IV, II, I, III b. IV, I, II, III c. I, II, III, IV d. IV, II, III = I e. I = III, II, IV
What is the total energy stored in the group of capacitors shown if the charge on the 30-?F capacitor is 0.90 mC?
a.
29 mJ
b.
61 mJ
c.
21 mJ
d.
66 mJ
e.
32 mJ