When an object is partly or wholly immersed in a liquid, it is buoyed up
A) by a force equal to its own weight.
B) by a force equal to the weight of liquid displaced.
C) and floats because of Archimedes' principle.
D) but sinks.
E) none of the above
Answer: B
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Impulse: A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg of water per second, what is the minimum velocity of the stream needed to knock down the door, assuming the water doesn't bounce back?
A. 15 m/s B. 20 m/s C. 25 m/s D. 30 m/s
At Titan, the weather is driven by phase changes of ________ gas into liquid or solid forms
Fill in the blank(s) with correct word
The Big Bang theory seems to explain how elements were formed during the first few minutes after the Big Bang. Which hypothetical observation below (these are not real observations) would call our current theory into question?
A) the discovery of a galaxy with 27% helium rather than the 25% that theory tells us was produced in the Big Bang B) the discovery of a galaxy with a helium abundance of only 10% by mass C) the discovery of a star-like object made entirely of carbon and oxygen D) the discovery of a planet that with no helium in its atmosphere
Which of the following is not true about potential energy?
a. Potential energy is stored energy. c. Potential energy is a scalar quantity. b. Potential energy is related to position. d. Potential energy has direction.