All the following statements are true. Which one explains why mean solar time differs from apparent solar time?
A) The length of a solar day is not always exactly 24 hours.
B) Earth's rotation period is actually about 23 hours and 56 minutes, not 24 hours.
C) Earth's axis precesses with a period of about 26,000 years.
D) The Sun reaches the meridian at different times at different longitudes within the same time zone.
E) The path of the Sun through the sky depends on both latitude and date.
A) The length of a solar day is not always exactly 24 hours.
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Capacitors of values 6.0 mF and 9.0 mF are connected in series to a 30.0 V power supply. What is the resulting potential difference across the 6.0 mF capacitor?
A. 30 V B. 18 V C. 12 V D. 6.0 V E. 3.0 V
When a load is placed on the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes
A) tension. B) compression. C) either of these D) none of these
To say that water has a high specific heat capacity is to say that water
A) requires a lot of energy for an increase in temperature. B) releases a lot of energy in cooling. C) absorbs a lot of energy for an increase in temperature. D) all of the above
What does this infrared photograph of a toaster reveal?
a. The wavelength or frequency of the main infrared radiation emitted depends on temperature. b. Heat flows by conduction. c. Heat flows by convection.