Process of Science: Explain the phrase used by Carl Sagan, "Extraordinary claims require extraordinary evidence."
What will be an ideal response?
Whenever someone claims to have found or witnessed something, the burden of proof is on them. This is especially true for claims that have a major significance such as a new theory, overturning an established theory or, of particular relevance to this Chapter, of extraterrestrial life.
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Constant Acceleration Kinematics: A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s2.(a) How long after beginning to accelerate does it take the car to move 3.50 km?(b) How fast is the car moving just as it has traveled 3.50 km?
What will be an ideal response?
Comets are made mostly of
A) rock. B) hydrogen gas. C) rock and metal. D) metal. E) rock and ice.
One mole of an ideal gas has a temperature of 25°C. If the volume is held constant and the pressure is doubled, the final temperature (in °C) will be
A. 174 B. 596 C. 50 D. 323 E. 25
Suppose we compare the combined mass of a C atom and an O2 molecule, both at rest, with the mass of a CO2 molecule, also at rest. According to Einstein's theory, the combined mass of the C and O2 is
A) slightly less, by an amount so small that it hard to measure, than the CO2 molecule's mass. B) precisely equal to the CO2 molecule's mass. C) considerably more than the CO2 molecule's mass. D) considerably less than CO2 molecule's mass. E) slightly more, by an amount so small that it hard to measure, than the CO2 molecule's mass.