The orbit of Comet UX209 about the Sun is not a circle but it orbits once every 365 days, just as Earth does. UX209 is closer to the Sun in April than it is in October. Thus, the speed of UX209 as it moves along its orbit is
A. steadily decreasing all year long.
B. steadily increasing all year long.
C. greater in October than it is in April.
D. greater in April than in October.
E. the same all year long.
Answer: D
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A 5-g coin is dropped from a 300-m building. If it reaches a terminal velocity of 45 m/s, and the rest of the energy is converted to heating the coin, what is the change in temperature (in °C) of the coin? (The specific heat of copper is 387 J/kg×°C.)
a. 9 b. 2 c. 5 d. 21 e. 0.5
Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma. As the tip of the beam passes her rocket, Mort observes
A) the beam moving just 1000 km/s faster than Velma. B) the beam moving away at 300,000 km/s. C) Both of the above. D) the beam moving 300,000 km/s faster than Velma. E) All of the above.
How is the number of unpaired valence electrons in an atom related to the number of bonds that the atom can form?
A) There is no defined relationship between the number of unpaired valence electrons and number of bonds that the atom can form. B) The number of unpaired valence electrons in an atom is one-half the number of bonds that the atom can form. C) The number of unpaired valence electrons in an atom is twice the number of bonds that the atom can form. D) The number of unpaired valence electrons in an atom is the same as the number of bonds that the atom can form.
The three major types of seawater movement are ______________, currents, and tides
Fill in the blank(s) with correct word