Recall that an up quark (u) has a charge of +2/3 and a down quark (d) has a charge of -1/3. Which of the following quark compositions describes a proton?
A) uuu
B) uud
C) udd
D) uuudd
B
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Energy Conservation With Nonconservative Forces: A 7.5-kg otter slides down a hill, starting from rest at the top. The sloping surface of the hill is 8.8 m long, and the top is 6.5 m above the base. If the speed of the otter at the bottom of the hill is 9.2 m/s, how much energy was lost to nonconservative forces on the hill?
Fill in the blank(s) with the appropriate word(s).
Much of Mercury's cratered surface closely resembles the lunar ________
Fill in the blank(s) with correct word
The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block?
?
?
A. 1.8 m/s2 B. 2.6 m/s2 C. 1.4 m/s2 D. 2.2 m/s2 E. 3.7 m/s2
What type of volcano forms a layered, composite cone?
a. Fumarole b. Cinder cone c. Stratovolcano d. Shield volcano