Theoretical calculations suggest that Earth-sized planets could be habitable on their surfaces outside of habitable zones if they
A) have thick, hydrogen atmospheres
B) have thick carbon dioxide atmospheres
C) are tidally heated by several large moons
D) have larger irons cores
A
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At what two celestial locations do the celestial equator and ecliptic coincide?
a. winter solstice and summer solstice b. vernal equinox and autumnal equinox c. they coincide at all points because they are the same. d. north celestial pole and south celestial pole e. zenith and east point
Irrotational flow means that a fluid element experiences a net angular velocity
Indicate whether the statement is true or false
A jet plane flying 600. m/s experiences an acceleration of 4.0 g when pulling out of the dive. What is the radius of curvature of the loop in which the plane is flying?
A) 1.2 km B) 5.8 km C) 0.64 km D) 9.2 km E) 7.0 km
A far sighted person can not see clearly objects that are closer to his eyes than 60.0 cm
Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the objects at a distance of 25.0 cm from his eyes? A) -42.9 cm, +2.33 diopters B) -42.9 cm, -2.33 diopters C) +42.9 cm, +2.33 diopters D) +42.9 cm, -2.33 diopters E) +60 cm, +42.9 diopters