In the deep ocean trenches, there are hydrothermal vents, which discharge very hot water. In one such vent, the temperature of the water is 300°C. Why does this water not boil?
What will be an ideal response?
The water does not boil because the boiling point depends on the pressure, and the pressure at that location is very high.
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In order to understand star clusters, we need to be able to estimate their ages. What technique do scientists use for this?
A) radioisotope dating B) counting the planets that have formed around the largest stars C) finding the main-sequence turnoff point of the stars D) calculating orbital parameters using Kepler's Laws E) measuring its parallax
How far from a covnex lens of focal length 30 cm must an object be placed so the image will be virtual and 3.0 times as large as the object?
What will be an ideal response?
How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
a. 0.22 kJ b. 0.20 kJ c. 0.24 kJ d. 0.27 kJ e. 0.31 kJ
Observational evidence tells you that as a nova explosion begins, _____
A) a cloud of debris ejects into space B) matter settles inward onto the surface of a white dwarf and forms a layer of unused nuclear fuel C) dense gas comes toward you at a few thousand kilometers per second D) the spectral lines change to emission lines