When is the soonest we are likely to have moderate-resolution images and spectra of Earthlike planets around other stars?
A) in a decade or two, through space observatories now in the early planning stages
B) in just a few years, through analysis of observations by the GAIA mission
C) any day now, thanks to our largest ground-based telescopes
D) in just a few years, through analysis of observations by the James Webb Space Telescope
A) in a decade or two, through space observatories now in the early planning stages
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Terminal Voltage and Internal Resistance: A battery you buy at the store has an internal emf of 3.0 V. If it has an internal resistance of 14.0 ?, that current will this battery put out if it is short-circuited?
A. 0.21 A B. 42 A C. 4.7 A D. 130 A
A hockey puck sliding at constant velocity across the ice is
A) in equilibrium. B) nearly in equilibrium. C) is nowhere near being in equilibrium. D) none of the above
Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in series with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in series with the other two. As the lightbulbs are added, the lifetime of
the battery (Neglect the battery’s internal resistance.) 1.increases. 2.decreases. 3.remains the same. 4.Need more information.
The current in an inductor connected to an AC voltage source lags the voltage. This lag is caused by the:
a. back emf in the coil. b. voltage across the coil. c. time required for electrical signals to travel through all the coils of an inductance. d. resistance of the coil.