A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced
If this battery supplies a current of 25 mA to the player, what is the cost of the energy provided by the battery in dollars per kWh?
A) $11/kWh B) $11,000/kWh C) $1100/kWh D) $110/kWh
C
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According to Kirchhoff's first law why do dense, hot bodies create the type of spectrum they do?
What will be an ideal response?
Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?
A) Supermassive black holes existed only when the universe was young, and no longer exist today. B) Active galactic nuclei can form only at large distances from the Milky Way. C) Active galactic nuclei exist tend to become less active as they age. D) The jets seen in many active galactic nuclei must cause them to move far away from us.
During the period of one day, the number of high tides at a given location is about __________
Fill in the blank(s) with correct word
Briefly explain why stars that formed early in the history of the galaxy contain a smaller proportion of heavy elements than stars that formed more recently
What will be an ideal response?