If a planet is to be a suitable home for living things, it must:
A) have a star more massive and luminous than the spectral type F5.
B) be a part of a binary star system.
C) be in a stable orbit around its sun.
D) have an orbit smaller than the habitable zone of the star.
C
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How did the Ptolemaic model explain the apparent retrograde motion of the planets?
A) The planets moved along small circles that moved on larger circles around Earth. B) The planets sometimes stopped moving and then reversed to move backward along their circular orbits. C) The model showed that apparent retrograde motion occurs as Earth passes by another planet in its orbit of the Sun. D) The planets resided on giant spheres that sometimes turned clockwise and sometimes turned counterclockwise.
At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?
A) 45° B) 30° C) 0° D) 90° E) ? radians
A Nichrome wire has a radius of 0.50 mm and a resistivity of 1.5 × 10^-6 W×m. If the wire carries a current of 1.0 A, what is the potential difference per unit length along this wire?
a. 1.9 V/m c. 1.6 V/m b. 0.95 V/m d. 0.003 V/m
Why modify the Grashof number for inclined surfaces?
What will be an ideal response?