A spacecraft has captured and brought material to Earth from a comet
Indicate whether the statement is true or false
TRUE
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A package is dropped from a helicopter that is moving upward at 15 m/s If it takes before the package strikes the ground, how high above the ground was the package when it was released? Neglect air resistance
What will be an ideal response?
A heat pump has a coefficient of performance that is 60% of the Carnot heat pump coefficient of performance. The heat pump is used to heat a home to 24.0°C during the winter with the low temperature reservoir at the outdoor temperature
At which outdoor temperature would it be more efficient to add the energy directly to the interior of the home than use it to run the heat pump? A) -25.2°C B) -154°C C) -40.0°C D) -83.4°C E) -4.00°C
As shown in the above image, rising material is flowing from the penumbra and into the umbra where it sinks
a. True
b. False
A mercury thermometer has a glass bulb of interior volume 0.100 cm3 at 10°C. The glass capillary tube above the bulb has an inner cross-sectional area of 0.012 mm2. The coefficient of volume expansion of mercury is 1.8 × 10-4 K-1
If the expansion of the glass is negligible, how much will the mercury rise in the capillary tube when the temperature rises from 5°C to 35°C if the bulb was full at 5°C? A) 0.45 mm B) 4.5 mm C) 45 mm D) 45 cm