When a twirling ice skater brings her arms inward, her rotational speed
A) decreases.
B) remains the same.
C) increases.
Answer: C
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When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances?
a. 7.2 ? b. 7.6 ? c. 6.9 ? d. 8.0 ? e. 2.8 ?
Evolution is actually random
Indicate whether the statement is true or false
For a first-quarter Moon, approximately what is the angle eastward from the Sun to the Moon?
a. 30° b. 90° c. 180° d. 360° e. 0°
The peak of a body's blackbody radiation curve shifts toward longer wavelength as the temperature of the body increases
Indicate whether the statement is true or false