A projectile is launched vertically upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is
A) less than 50 m/s.
B) 50 m/s.
C) more than 50 m/s.
Answer: B
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The eccentricity of a planet's orbit describes
a. westward motion in the night sky when observed on successive nights. b. the deviation in shape when compared to a circle. c. its tilt with respect to the ecliptic plane. d. the tilt of the planet's rotational axis with respect to the ecliptic.
Which of the following statements is true of the spectral sequence?
A) It is classified in groups labeled A through Q. B) M stars are cooler and fainter than L dwarfs. C) Y dwarfs are a class of objects with temperatures above 500 K. D) O stars are the hottest, and M stars are the coolest.
Suppose two charges, one positive and one negative, are separated by a distance d. Where can two equipotential surfaces at different potentials intersect in the region near the charges?
a. halfway between the charges if the charges have the same magnitude b. closer to the smaller negative charge than the larger positive charge if the charges are not equal c. Equipotential surfaces at different potentials cannot intersect. d. closer to the smaller positive charge than the larger negative charge if the charges are not equal
If a beam of blue light has a wavelength of 400 nm is emitted by an object moving away from you at 1% of the speed of light, what wavelength would you see from this light?
A) 396 nm B) 399 nm C) 400 nm D) 401 nm E) 404 nm