Which of the following expresses 72 × 102 g correctly using prefixes given?
1
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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
Which of these lamps has no mercury content?
A) fluorescent lamp B) CFL C) incandescent lamp D) none of the above
During the day, the Sun is too bright for us to see where it is located with respect to the constellations, but we can use our observations of stars at night to figure this out. Based on the way stars shift position over the course of a year, your knowledge of how the time of day is defined, and the fact that the same constellations are seen at the same place in the sky at the same time of night on a given day of the year, which of the following is most likely correct?
A. The Sun appears to move across the constellations over the course of a year, ending where it started with respect to the background stars by the end of that period. B. The Sun appears to move across the constellations over the course of a 24-hour period, ending where it started with respect to the background stars by the end of that period. C. The Sun always appears to be in front of the same constellation. D. The Sun's apparent location with respect to the constellations is random and cannot be predicted.
When do spring tides occur? How much tidal variation is noted?
What will be an ideal response?