The temperature scale that places zero at the point where all atomic and molecular motion ceases is:
A) Fahrenheit.
B) Celsius.
C) Kelvin.
D) centigrade.
E) Ransom.
C
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Two particles, each of charge 2.5 × 10^–19 C, are 4.8 × 10^–5 m apart. What is the change in potential energy if they are brought 2.4 × 10^–5 m closer together? (ke = 8.99 × 10^9 N·m2/C2)
a. 1.2E–23 J b. 4.7E–24 J c. 2.3E–16 J d. 1.4E–15 J e. 2.9E–20 J
If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm, what is the average current density in this wire?
A) 7.6 × 105 A/m2 B) 5.2 × 10-6 A/m2 C) 1.9 × 105 A/m2 D) 3.6 × 105 A/m2 E) 21 × 10-6 A/m2
The speed of light in a particular transparent medium is 2/8 the speed of light in a vacuum. What is the index of refraction of the material?
a. 1.3 b. 0.75 c. 4 d. 0.25
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
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