Terminal Voltage and Internal Resistance: When an external resistor of resistance R1 = 14 ? is connected across the terminals of a battery, a current of 6.0 A flows through the resistor. When a different external resistor of resistance R2 = 64.4 ? is connected instead, the current is 2.0 A. Calculate (a) the emf of the battery and (b) the internal resistance of the battery.
Fill in the blank(s) with the appropriate word(s).
(a) 150 V (b) 11 ?
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Faraday's Law: A flat rectangular coil with dimensions of 8.0 cm × 10 cm is dropped from a zero magnetic field position into a 1.4-T magnetic field in 0.10 s. The coil has 60 turns and is perpendicular to the magnetic field. What is the average induced emf in the coil as a result of this action?
A. 8.6 V B. 2.4 V C. 6.7 V D. 3.6 V E. 0 V
The best time for digging clams (when the low tide is extra low) is during the time of the
A) new or full moon. B) half moon. C) quarter moon. D) none of the above
Concerning dark energy, we do know
A) combined with dark matter, it will ultimately produce a closed universe. B) its density remains constant over time, so it is not important in the early universe. C) that it is created when matter annihilates anti-matter. D) that it was revealed with Type II supernovae distances in the late 1990s. E) that it makes up 90% of all the matter and energy in the whole universe.
In an isolated system of two bodies that exert gravitational forces on one another, the quantity (quantities) that remain(s) constant is(are)
a. the total energy of the system. b. the total angular momentum of the system. c. the angular positions of the two bodies. d. all of the above. e. only (a) and (b) above.