The age of the Universe can be deduced from
A. Kepler's Third law.
B. Hubble's law.
C. Shapley's law.
D. the Doppler shift law.
E. the Inverse-square law.
Answer: B
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A solenoid 4.0 cm in radius and 4.0 m in length has 8000 uniformly spaced turns and carries a current of 5.0 A. Consider a plane circular surface (radius = 2.0 cm) located at the center of the solenoid with its axis coincident with the axis of the solenoid. What is the magnetic flux through this surface? (1 Wb = 1 T / m2)
a. 63 ?Wb b. 16 ?Wb c. 0.25 mWb d. 10 ?Wb e. 5.0 ?Wb
Tycho Brahe's greatest contribution to astronomy was
a. his model of the universe. b. his telescopic observations. c. his discovery of three laws of motion. d. his 20 years of careful observations of the planets. e. a and b above
During the month of June the north celestial pole points towards Polaris, but during the month of December it points
a. just north of Polaris. b. just south of Polaris. c. towards the star Vega. d. towards the star Thuban. e. still towards Polaris.
The weight of an object on the Moon is what fraction of the weight of the same object on Earth?
What will be an ideal response?