Astronomer Alan says the universe is expanding at one rate and Astronomer Wendy says it is expanding at a faster rate. All other things being equal, which astronomer would say that the universe is older?
A) Wendy
B) Alan
C) neither
B) Alan
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A loop of wire (resistance = 2.0 m?) is positioned as shown with respect to a long wire which carries a current. If d = 1.0 cm, D = 6.0 cm, and L = 1.5 m, what current is induced in the loop at an instant when the current in the wire is increasing at a rate of 100 A/s?
A. 34 mA B. 30 mA C. 27 mA D. 38 mA E. 0.50 mA
Based on current evidence and understanding, what is the composition at the center of Neptune and in fact at the center of all the giant planets in the outer Solar System?
A. swiss cheese. B. liquid core made of hydrochloric acid C. methane gas mixed with water. D. a solid, rocky core. E. There is no core; Neptune just has an atmosphere.
How long a tuning fork vibrates when its handle is held against a table is most related to
A) its frequency. B) resonance. C) the conservation of energy. D) the length of its prongs.
Currently, in the United States, which fuel is utilized to produce the majority of electrical power?
a. Oil b. Natural gas c. Coal d. Nuclear