The color force between quarks is carried by mesons
a. True
b. False
Indicate whether the statement is true or false
False
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A circular hole is drilled into an aluminum sheet. When the sheet is heated, the diameter of the hole will
a. become smaller. b. become larger. c. depend on the thickness of the sheet. d. not be affected.
The cratered surfaces of Saturn's moons may look like our moons, but in reality they are made chiefly of ________
Fill in the blank(s) with correct word
Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________
a. has a very large "sunspot" on its surface b. is a member of an eclipsing binary star system c. is a white dwarf d. is a Cepheid variable e. is periodically ejecting gas into space, every 93 hours
Lens-Maker Formula: A thin double-convex lens is intended to focus the image of an object onto a screen so that the image is life-sized on the screen. The lens has equal-magnitude radii of 83 cm and a refractive index of 1.6. (a) What is the distance d from the image to the screen?(b) What is the total distance L between the object and the image?
A. (a) d = 138 cm (b) L = 276 cm B. (a) d = 276 cm (b) L = 552 cm C. (a) d = 69 cm (b) L = 35 cm D. (a) d = -138 cm (b) L = -276 cm