At what frequency should a 200-turn, flat coil of cross sectional area of 300 cm2 be rotated in a uniform 30-mT magnetic field to have a maximum value of the induced emf equal to 8.0 V?
A. 7.5 Hz
B. 7.1 Hz
C. 8.0 Hz
D. 8.4 Hz
E. 16 Hz
Answer: B
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A vocabulary in context exercise in which students match words to definitions describing elliptical planetary orbits, applying ideas from Kepler’s Laws of Planetary Motion
1. Earth is located at one _______ of the Moon's orbit. 2. According to Kepler's second law, Jupiter will be traveling most slowly around the Sun when at _______. 3. Earth orbits in the shape of a/an _______ around the Sun. 4. The mathematical form of Kepler's third law measures the period of years and the _______ in astronomical units (AU). 5. According to Kepler's second law, Pluto will be traveling fastest around the Sun when at _______. 6. The extent to which Mars' orbit differs from a perfect circle is called its ______.
While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 Watts during a race, how fast is the person running? Assume a running step is 1.5 m long
The radius of the earth is 3963 mi. Which one of the following numbers is closest to the surface area of the earth? (1.0 mi = 1609 m)
A) 4.9 × 107 m2 B) 1.3 × 1014 m2 C) 2.6 × 1014 m2 D) 5.1 × 1014 m2
When a 12-V battery powers a single 6-ohm lamp,
A) 2 joules flow in the lamp each second. B) 6 joules flow in the lamp each second. C) 12 joules flow in the lamp each second. D) none of the above