From hottest to coolest, the order of the spectral types of stars is
A) OBAFGKM.
B) OBAGFKM.
C) ABFGKMO.
D) OMKGFBA.
E) ABCDEFG.
A) OBAFGKM.
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A horizontal force of magnitude 6.5 N is exerted tangentially on a Frisbee of mass 32 grams and radius 14.3 cm. Assuming the Frisbee, a uniform disk, is originally at rest and the force is exerted for 0.08 s, determine the angular velocity of rotation about the central axis when the Frisbee is released.
What will be an ideal response?
Find the orbital speed of an ice cube in the rings of Saturn. The mass of Saturn is 5.68 × 1026 kg and the rings have an average radius of 100,000 km. (G = 6.67 × 10-11 N • m2/kg2)
A) 19.5 km/s B) 27.5 km/s C) 13.8 km/s D) 1.95 km/s
You stand near the earth's equator. A positively charged particle that starts moving parallel to the surface of the earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the
earth are directed a. upward. b. downward. c. from south to north. d. from north to south. e. from east to west.
How many valence electrons does gallium (Ga, atomic no. = 31) have?
A) 1 B) 6 C) 3 D) 31 E) 70