A banana will appear black when illuminated with
A) black light.
B) blue light.
C) red light.
D) green light.
Answer: B
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Motional Emf: An eagle, with a wingspread of 2.0 m, flies toward the north at 8.0 m/s in a region where the vertical component of the earth's magnetic field is 0.20 × 10-4 T. What emf would be developed between the eagle's wing tips? (It has been speculated that this phenomenon could play a role in the navigation of birds, but the effect is too small, in all likelihood.)
Fill in the blank(s) with the appropriate word(s).
When a comet is in the inner solar system, what part of it points most directly away from the Sun?
A) the denser side of its nucleus B) its coma C) jets of gas emerging from its nucleus D) its tail
Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy A. According to Hubble's law, what can you say about their approximate relative distances?
A) Galaxy A is twice as far as Galaxy B. B) Galaxy B is four times as far as Galaxy A. C) Galaxy A is four times as far as Galaxy B. D) Galaxy B is twice as far as Galaxy A. E) Not enough information to say—you need to know Hubble's constant to answer this question.
In a section of horizontal pipe with a diameter of 3.00 cm the pressure is 100 kPa and water is flowing with a speed of 1.50 m/s. The pipe narrows to 2.00 cm. What is the pressure in the narrower region?
A) 95.4 kPa B) 47.7 kPa C) 44.4 kPa D) 225 kPa E) 66.7 kPa