Which of the following explains why the stars visible in our sky just after sunset are different from those visible just before sunrise?
A) Earth rotates once each day.
B) Earth orbits the Sun once each year.
C) The direction of Earth's axis in space precesses with a period of about 26,000 years.
D) Stars appear to move randomly relative to our Sun in the local solar neighborhood.
E) The universe is expanding.
A) Earth rotates once each day.
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Impedance is the total, or effective, opposition to current that takes into account both resistances and reactances
Indicate whether the statement is true or false
Consider a star with 2 planets. The mass of planet A is the same as the mass of planet B. The orbit of Planet A is on average, closer to the star than the orbit of Planet B. Which of the following statements is true?
A) Planet A moves with the same speed as Planet B. B) Planet A is, on average, moving slower than Planet B. C) The relative orbital speeds depend on the masses of the planets. D) Planet A is, on average, moving faster than Planet B.
An inventor tries to sell you his new thermodynamic engine that takes in 40 J of energy at 87°C on each cycle, expels 30 J at 27°C, and does 10 J of work
Would it be wise to invest in this engine? Back up your conclusion with numerical calculations.
What is the major problem with the U.S. customary system?
a. It is out of date. b. Understanding the units does not require knowing English. c. It has many different unfamiliar units and conversions are difficult. d. It avoids cumbersome conversions of units. e. It does not allow conversion to metric units.