A charged particle q, traveling through a magnetic field, has the force FB acting upon it. Another particle with charge equals to –2q will have the same force acting upon it if
1.it moves at half the velocity in the opposite direction.
2.it moves at twice the velocity in the opposite direction.
3.it moves at half the velocity in the same direction.
4.it moves at twice the velocity in the same direction.
1
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A 120-V rms voltage at 1000 Hz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 ?, what is the maximum value of the current?
A) 1.54 A B) 1.09 A C) 1.84 A D) 1.04 A E) None of the other answers is correct.
A spaceship from another galaxy passes over the solar system directly above a radial line from the Sun to the Earth. (We measure that distance to be 1.5 × 10^11 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80c, for which ? = 5/3 . As measured on Earth it takes the spaceship 625 seconds to travel from the Sun to Earth. When a scientist in the spaceship measures the
Earth-Sun distance and the time it takes her to travel that distance, she finds the results are, respectively a. 9.0 × 10^10 m; 375 s. b. 9.0 × 10^10 m; 625 s. c. 1.5 × 10^11 m; 625 s. d. 2.5 × 10^11 m; 625 s. e. 2.5 × 10^11 m; 1042 s.
How many atoms are present in a sample of pure iron with a mass of 210 g? (The atomic mass of iron = 56 u and NA = 6.02 × 10^23.)
a. 1.8 × 10^19 c. 2.3 × 10^24 b. 2.3 × 10^28 d. 3.2 × 10^28
What conclusion can be drawn from the fact that some planets and satellites with solid surfaces have impact craters?
A. The Sun went through several explosions, ejecting material that scarred the planets and satellites. B. The young planets had softer surfaces. C. Collisions between Solar System bodies and planetesimals were common at one time. D. Volcanoes were very active in the early stages of planet formation.