A charged insulator can be discharged by passing it just above a flame. This is because the flame:
A) warms it
B) dries it
C) contains carbon dioxide
D) contains ions
E) contains more rapidly moving atoms
D) contains ions
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The difference between a scientific law and a theory is
What will be an ideal response?
A boxcar without a front or a back is moving toward the right. Two electrons move through the boxcar, one moving from back to front toward the right, the other moving from front to back toward the left. According to me, each electron is moving with a speed of 0.8c, and the boxcar is moving with a speed of 0.6c. A passenger in the boxcar records how long it takes each electron to pass from one end
of the boxcar to the other end. According to the passenger, which took longer? a. the electron going from back to front b. the electron going from front to back c. They both took the same time. d. Since nothing can go faster than light, an electron cannot move toward the left with a speed of 0.8c through a boxcar moving toward the right with a speed of 0.6c.
If a photon's frequency increases, its wavelength
A. will increase. B. will decrease. C. will not change.
How much work is required to increase the velocity of a 4 kg car from rest to 5 m/sec?
a. 10 b. 20 c. 50 d. 100 e. 200 Joules