Which of these are the flavors of quarks?
a. Spin, and strangeness, and force they participate in.
b. Charge, mass, and kinetic energy.
c. Up, down, strange, charm, bottom, and top.
d. Up, down, and strange.
e. Neutron, proton, and electron.
c
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The ________ theory offers a likely explanation for the formation of ________.
A. density wave; spiral arms B. high rotation speed; spiral arms C. density wave; Galactic bulge D. high rotation speed; dark matter
Suppose you and a friend have very precise clocks. You are on the ground floor of a tall building and your friend is on the roof. Which of the following statements is true?
A) You will see your friend's clock ticking faster than yours, and she will see your clock ticking faster than hers. B) You will see your friend's clock ticking slower than yours, and she will see your clock ticking slower than hers. C) You will see your friend's clock ticking faster than yours, and she will see your clock ticking slower than hers. D) You will see your friend's clock ticking slower than yours, and she will see your clock ticking faster than hers.
A sand mover at a quarry lifts 2,000 kg of sand per minute a vertical distance of 12 m. The sand is initially at rest and is discharged at the top of the sand mover with speed 5.0 m/s into a loading chute
What minimum power must be supplied to this machine? A) 6.7 kW B) 4.3 kW C) 3.9 kW D) 1.1 kW E) 520 W
The magnitude of the charge on an electron is approximately:
A) 1023 C B) 10-23 C C) 1019 C D) 10-19 C E) 109 C