Which of the following types of stars are suitable for advanced life?
A) A-type
B) F-type
C) O-type
D) K-type
D
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One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
a. 4.0 ?T b. 5.0 ?T c. 3.0 ?T d. 7.0 ?T e. 1.0 ?T
In order to produce a sustained interference pattern by light waves from multiple sources, which of the following conditions must be met?
a. Sources are coherent. b. Sources are monochromatic. c. Both choices above are valid. d. None of the choices above are valid.
Match the words in the left-hand column to the appropriate blanks in the sentences in the right-hand column. Use each word only once.
Saturn, Earth, Mars, Venus, Uranus, Mercury, Jupiter, Neptune
1. ____________ has a rotational axis that is tilted so much it lies nearly in the plane of its orbit.
2. ____________ is the planet with the highest average surface temperature.
3. The planet that orbits closest to the Sun is __________.
4. The only rocky planet to have more than one moon is ___________.
5. ___________ is the jovian planet that orbits closest to the Sun.
6. Most of the surface of _________ is covered with liquid water.
7. ___________ is about 30 times as far from the Sun as our own planet.
8. The planet with the lowest average density is ___________.
The optimal exercise frequency for improving one's health related cardiorespiratory fitness level is three to five days per week.
Indicate whether the statement is true or false.