In a circuit, three pieces of wire labeled A, B and C are joined at a common point, D. If wire B carries 1.5 mA in a direction away from D and C carries current 1.3 mA toward D, what does wire A carry?
A. 0.2 mA toward D
B. 0.2 mA away from D
C. 2.8 mA toward D
D. unable to determine
E. 2.8 mA away from D
A. 0.2 mA toward D
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If the temperature of an ideal gas contained in a box is increased
a. the average velocity of the molecules in the box will be increased. b. the average speed of the molecules in the box will be increased. c. the distance between molecules in the box will be increased. d. all of the above.
A spherical oil droplet with nine excess electrons is held stationary in an electric field between two large horizontal plates that are 2.25 cm apart
The field is produced by maintaining a potential difference of 0.3375 kV across the plates, and the density of the oil is 824 kg/m3. What is the radius of the oil drop? (e = 1.60 × 10-19 C)
The collision of two gamma rays can result in a single particle
Indicate whether the statement is true or false
Which of the following is true of natural selection?
A) It is a random occurrence. B) It does not occur in most species of organisms. C) It is directed by changes in the environment. D) It does not lead to evolution of a species.