The lifetime of a fossil fuel resource, formed by dividing the total reserves by the current use rate, is an accurate measure of the number of years of that resource remaining to be exploited
What will be an ideal response?
It is not possible because the use of fossil fuels is growing. We discussed the
question of linear and exponential growth in several chapters. The linear lifetime is always
greater than the exponential lifetime.
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Which of these is NOT a common misconception?
a. A light year is a unit of time. b. Stars look like disks when seen through a telescope c. A galaxy is a star plus its planets. d. All of the other choices are misconceptions.
Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. Each bright fringe will shift to the location of the adjacent bright fringe if a thin film is placed in front of one of the slits. The minimum width of this film must be
A.
.B.
.C.
.D.
.E.
.Which of the following statements is true for a series RLC ac circuit in resonance? (There could be more than one correct choice)
A) The inductive reactance and the capacitive reactance are both equal to zero. B) The inductive reactance is equal to the capacitive reactance. C) The current in the circuit is a minimum. D) The current in the circuit is a maximum. E) The rms current is equal to the peak current.
A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is ? = 0.25 . If the car maintains a constant speed of 40 m/s, it will
a. attempt to dig into the road surface. b. tend to veer toward the center of the semicircle. c. arrive safely at the end of the semicircle. d. tend to veer toward the outside of the circle. e. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.