A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her moment of inertia decreases by 1/2. Her angular speed increases by a factor of
A) 2.
B) 4.
C) .
D) 1
E) 1/2.
A
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The largest and deepest impact basin found on Mars is:
A) Olympus. B) Caloris. C) Hellas. D) Tharsis. E) Meridani.
A monochromatic (single frequency, single wavelength) light ray in air (n = 1) enters a glass prism (n = 1.5). In the glass prism
a. both the frequency and the wavelength are the same as in air b. the frequency is the same, but the wavelength is greater than in air. c. the frequency is the same, but the wavelength is smaller than in air. d. the wavelength is the same, but the frequency is greater than in air. e. the wavelength is the same, but the frequency is smaller than in air.
Consider a 1.40 kW hair dryer operated on 120. V. What is (a) the current? (b) its resistance?
What will be an ideal response?
A 2-kg mass that weighs 20 N has 40 J of potential energy relative to the ground. What is its height?
A) 1 m B) 2 m C) 3 m D) 4 m E) none of the above