On a Hertzsprung-Russell diagram, where would we find stars that are cool and luminous?
A) upper right
B) lower right
C) upper left
D) lower left
A
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Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?
A) atomic number = 13; atomic mass number = 6 B) atomic number = 6; atomic mass number = 7 C) atomic number = 6; atomic mass number = 13 D) atomic number = 7; atomic mass number = 13
Since the planet receives a net of about 100 W/m2, would a change of 4 W/m2 be considered substantial? Explain. (Chapter 17 shows that this is the size of the greenhouse effect.)
What will be an ideal response?
A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
a. 5.1 × 10^4 Ns. b. 6.1 × 10^4 Ns. c. 8.0 × 10^4 Ns. d. 5.0 × 10^5 Ns. e. 6.0 × 10^5 Ns.
If a binary system has a period of 4 years and a separation of 5 AU, then the total mass is 7.8 solar masses
Indicate whether the statement is true or false