A high tide is occurring at Charleston, South Carolina (45°W, 64°N). Which listed longitude is experiencing a low tide occurring?
a. 135°E
b. 65°E
c. 45°E
d. 45°W
e. 145°W
c
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The size of a neutron star is
a. about the same as that of our Solar System. b. about the same as that of the Sun. c. about the same as Earth. d. smaller than any of these.
Resistivity and Temperature: A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 ? at 20°C and increases to 3.072 ? as indium just starts to melt. What is the melting point of indium? The temperature coefficient of resistivity for platinum is 3.927 × 10-3/C°.
A. 116°C B. 136°C C. 156°C D. 351°C
All the following statements are true. Which one explains the reason that there is not a solar eclipse at every new moon?
A) The nodes of the moon's orbit precess with an 18-year period. B) The orbital plane of the Moon is tilted slightly (by about 5 degrees) to the ecliptic plane. C) The Moon is only about one-fourth as large as Earth in diameter. D) The Moon goes through a complete cycle of phases about every 29-1/2 days.
An object drops in free fall. At one instant it is moving at a speed of 50 meters per second. Exactly one second later its speed is about
1) 10 m/s. 2) 50 m/s. 3) 60 m/s. 4) 100 m/s. This is because 5) no net force acts on the object while in its state of free fall. 6) it gains a speed of about 10 m/s for each second of fall. 7) its velocity nearly doubles each second.