Water is flowing at 4.0 m/s in a circular pipe. If the diameter of the pipe decreases to 1/2 its former value, what is the velocity of the water downstream?
a. 1.0 m/s
b. 2.0 m/s
c. 8.0 m/s
d. 16 m/s
e. 4.0 m/s
d
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Which of the following best explains why a solar day is longer than a sidereal day?
A) Because Earth orbits the Sun at the same time it rotates, Earth must make slightly more than one full rotation between noon one day and noon the next. B) The precession of Earth's axis gradually changes the length of the solar day while leaving the length of the sidereal day alone. C) The fact that Earth's orbit is not a perfect circle causes the length of the solar day to vary during the year, so that it the solar day is sometimes longer and sometimes shorter than a sidereal day. D) The Sun rotates much as the Earth does, but more slowly, so that a solar day is longer than a sidereal day.
The fundamental particles that are the building blocks of hadrons are __________
Fill in the blank(s) with correct word
Two vectors starting at the same origin have equal and opposite x components. Is it possible for the two vectors to be perpendicular to each other? Justify your answer.
What will be an ideal response?
Solar power is commonly used to produce
A) heat. B) electricity. C) both of these