The tides on Earth are an example of
A) Newton's first law of motion.
B) Newton's second law of motion.
C) Newton's third law of motion.
D) the universal law of gravitation.
E) none of the above
D
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AC Generator: You wish to construct a simple ac generator with a maximum output of 12 V when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns are needed?
Fill in the blank(s) with the appropriate word(s).
The mass of the Moon is 7.4 × 1022 kg, its radius is 1.74 × 103 km, and it has no atmosphere. What is the free-fall acceleration at the surface of the Moon? (G = 6.67 × 10-11 N ? m2/kg2)
A) 2.8 × 106 m/s2 B) 9.8 m/s2 C) 4.9 m/s2 D) 1.6 m/s2 E) 0.80 m/s2
Which of the following types of galaxies are typically reddest in color?
A) spirals B) ellipticals C) irregulars
Stars motion within the disk of the Milky Way galaxy are ordered in that they the all go in the same direction, counter-clockwise, as viewed from above (e.g., as viewed from above the north rotational axis of the Sun),
a. True b. False Indicate whether the statement is true or false