Which of the following is NOT true about public domain materials?
A. Copyrights and patents protect public domain materials.
B. One example is older material in which the copyright has expired.
C. The rights to public domain materials belong to the public at large.
D. All of the above are true.
Answer: A
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A type B star is bluer than a type G star
Indicate whether the statement is true or false
Why do astronomers suspect there may be a ninth planet beyond Neptune?
A. The Kuiper Belt is not in the expected position. B. Pluto has more moons than it should. C. Several Trans-Neptunian Objects have elongated orbits yet are all currently closest to the Sun. D. Neptune's orbit extends closer to the Sun than expected.
Pluto's density is 1.8 g/cm3 . Iron is about 5 g/cm3 . Rock is about is 3 g/cm3 . Ice or water is 1.0 g/cm3 . . This implies that
a. Pluto has a large iron-nickel core. b. Pluto is about 50% water and 50% rocky material. c. Pluto is all rock. d. Pluto is all water or water ice.
Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of excess charge and the other one carries +1µC of charge
No other charges or fields are present. Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice.) A) The acceleration of the 10-µC ball is 10 times that of the 1-µC ball. B) The balls always have accelerations of equal magnitude. C) The speed of the balls keeps increasing. D) The acceleration of the balls keeps increasing. E) The acceleration of the 1-µC ball is 10 times that of the 10-µC ball.