The figure below shows the orbit of a comet about the sun. If the area swept out by the line from the sun to the comet is equal when traveling from A to B and when traveling from D to E, what can we say about the time it takes
A. the time to travel from A to B is greater than the time from D to E.
B. the time to travel from A to B is the same as the time from D to E.
C. the time to travel from A to B is less than the time from D to E.
B. the time to travel from A to B is the same as the time from D to E.
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One light-minute is the distance light travels in one minute. The speed of light is about 300,000 km/s (3×105 km/s). How far is one light-minute?
A) 300 thousand km (300,000, or 3 × 105 km) B) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km) C) 1.08 billion km (1,080,000,000, or 1.08 × 109 km) D) 18 million km (18,000,000, or 1.8 × 107 km)
Which is characteristic of globular star clusters?
A) a mix of old and young stars, about 100,000 ly across B) old age and hundreds of thousands of stars, only about 30 ly wide C) bright blue main sequence stars, and thousands of them D) only brown dwarfs in a yellow ball 100 ly across E) no remaining main sequence stars, but millions of white dwarfs
The charge per unit length on an insulator is 6.2 ?C/m. On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are 7.8 × 10^13 more electrons than protons. b. There are 7.8 × 10^13 more protons than electrons. c. There are 3.9 × 10^13 more protons than electrons. d. There are 3.9 × 10^13 more electrons than protons.
The symbol for oxygen is
a. Ox. b. On. c. O. d. Xy.