A doubly charged ion with speed 6.9 × 106 m/s enters a uniform 0.80-T magnetic field, traveling perpendicular to the field. Once in the field, it moves in a circular arc of radius 30 cm. What is the mass of this ion? (e = 1.60 × 10-19 C)
A) 11 × 10-27 kg
B) 6.7 × 10-27 kg
C) 3.3 × 10-27 kg
D) 8.2 × 10-27 kg
A
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While the gondola is rising at a speed of 5.0 m/s, a passenger in a balloon-supported gondola throws a small ball up at a speed of 2.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up. b. 2.8 m/s, down. c. 3.0 m/s, up. d. 5.0 m/s, up. e. 7.0 m/s, up.
Cosmic Inflation refers to
A) an extremely rapid expansion of the early universe that occurred in an extremely brief period of time. B) the fact that there is an ever increasing energy cost in order for fusion within stars to occur. C) the phenomenon of matter within the universe is becoming increasingly disordered. D) is another way of referring to the Big Bang itself.
Which of the following cannot be determined from the spectrum of a star?
a. chemical composition b. surface temperature c. radial (along line of sight) velocity d. tangential (perpendicular to line of sight) velocity e. Both c and d
The nucleus is made of ____
a. electrons only. b. protons only. c. neutrons only. d. electrons and protons, usually. e. protons and neutrons, usually.