In the trajectory of a thrown object, like a baseball, the weight force is always downward. However, the force of air resistance is always
A. tangent to the trajectory and in the direction opposite the velocity.
B. perpendicular to the trajectory.
C. horizontal.
D. upward.
Answer: A
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Except Venus and Uranus, all the other planets:
A) rotate in the counterclockwise direction as seen from the north. B) revolve around their moons with their equators almost perpendicular to their orbits as seen from the north. C) revolve around the Sun in the clockwise direction as seen from the north. D) rotate on their sides with their equators almost perpendicular to their orbits as seen from the north.
Heat escapes from a planet's surface into space by thermal radiation. In which wavelength range do planets radiate most of their light?
A) infrared B) radio C) visible D) ultraviolet E) x-rays
Planetary orbits:
A) are evenly spaced throughout the solar system. B) are highly inclined to the ecliptic. C) are almost circular, with low eccentricities. D) have the Sun at their exact center. E) are spaced more closely together as they get further from the Sun.
A beam of white light in air passes through the transparent object shown. Dispersion is observed to occur. From the diagram we can tell that
A. the object behaves as a concave mirror. B. the object acts as a converging lens. C. the index of refraction is larger for blue light than red. D. the index of refraction is larger for red light than blue.