Typically a granule in the photosphere is about
A) the size of Texas, about 1,000 km across.
B) the size of our Moon, about 3,000 km across.
C) as big as Jupiter, around 100,000 km wide.
D) the size of Earth, around 12,000 km across.
E) the size of a city, 20-30 kilometers across.
A
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The process of formation of the Solar System
a) involved the Sun forming from the collapse of a large planet. b) began about 10 million years ago. c) led to the formation of the most massive planets closest to the Sun and the least massivefarthest away. d) involved a spinning cloud of gas that remained spherical until after the planets andSun formed. e) took only a small fraction of the age of the Solar System.
At absolute zero
A. all molecular motion is ceasing B. the pressure of an ideal gas is zero C. the volume of an ideal gas is zero D. the Celsius temperature is zero
A 0.600-mm diameter wire stretches 0.500% of its length when it is stretched with a tension of 20.0 N. What is the Young's modulus of this wire?
A) 5.66 × 1010 N/m2 B) 3.54 × 109 N/m2 C) 1.41 × 1010 N/m2 D) 6.43 × 109 N/m2 E) 2.78 × 109 N/m2
What force drives the planets along their orbits?
a. magnetism b. no force is needed to drive them along their orbits c. gravity d. solar wind