What is the magnetic force on a 2.0-m length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 55 mT and is directed at an angle of 20° away from the wire?
A. 1.5 N
B. 1.3 N
C. 1.1 N
D. 1.7 N
E. 3.1 N
Answer: C
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A crane lifts a 425 kg steel beam vertically upward a distance of 95m How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces
A) 4.0 × 105 J B) 3.2 × 105 J C) 4.7 × 105 J D) 2.7 × 105J
A photon is quantum of electromagnetic radiation
a. True b. False Indicate whether the statement is true or false
The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. Based on these data, the planet's orbital period is about
A) 2 days. B) 4 days. C) 6 days. D) 50 days.
You discover a binary star system in which one member is a15MSun main-sequence star and the other star is a 10MSun giant. How do we believe that a star system such as this might have come to exist?
A) The giant must once have been the more massive star but transferred some of its mass to its companion. B) Despite the low odds of finding a system with two such massive stars, there is nothing surprising about the fact that such systems exist. C) The two stars probably were once separate but became a binary when a close encounter allowed their mutual gravity to pull them together. D) The main-sequence star probably is a pulsating variable star and therefore appears to be less massive than it really is. E) Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main-sequence star millions of years later than its less massive companion.