What is the symbol used on the periodic table for the element Rubidium?
a. Rf
b. Hs
c. Rb
d. No
e. U
c
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The advantage that a lever can give you is that
A. with a small lever, you can move a large weight. B. with a large force, you can torque a large weight. C. with a small force, you can move a large weight. D. with a small torque, you can lift a large weight.
An incompressible fluid is flowing through a vertical pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. The pressure of the fluid in the wide section at the top is 200 kPa. The velocity of the fluid in the wide section is 4.00 m/s. The narrow section is located 8.00 m below the wide section. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal the pressure in the wide section? (density of the fluid is 680
A. 1.10 cm B. 1.20 cm C. 1.31 cm D. 1.42 cm E. 1.55 cm
No stars have been found with masses greater than 300 times our Sun because
A) molecular clouds do not have enough material to form such massive stars. B) they would fragment into binary stars because of their rapid rotation. C) they would generate so much power that they would blow themselves apart. D) they shine exclusively at X-ray wavelengths and become difficult to detect. E) they are not bright enough to be seen nearby.
According to current understanding, which of the following is required in order for a planet to have rings?
A) The planet must orbit its star at a distance greater than Mars orbits the Sun. B) The planet must have many small moons that orbit relatively close to the planet in its equatorial plane. C) The planet must once have had a large moon that came too close to it, shattering the moon and creating the ring particles. D) The planet must be at least as massive as Saturn.