The monthly (30 days) electric bill included the cost of running a central air-conditioning unit for 2 hr/day at 5000. W, and a series connection of ten 60. W lightbulbs for 5 hr/day
How much did these items contribute to the cost of the monthly electric bill if electricity costs 8ยข per kW-h?
$31.20
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At the end and along the sides of a glacier, the sediment deposits may form ridges known as ______________
Fill in the blank(s) with correct word
The event horizon
a. is believed to be a singularity. b. is a crystalline layer. c. has a radius equal to the Schwarzschild radius. d. marks the inner boundary of a planetary nebula. e. is located at the point where synchrotron radiation is created around a pulsar.
A stone is thrown vertically upward. At the top of its vertical path the force acting on it is
A) zero. B) only the force due to gravity. C) due to air resistance. D) both due to gravity and air resistance.
A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves upward. We may conclude that the magnetic field must have a component
A) towards the west. B) towards the east. C) towards the south. D) towards the north. E) downward.