In a thundercloud there may be an electric charge of +30 C near the top of the cloud and ?30 C near the bottom of the cloud. These charges are separated by about 4.00 km. What is the electric force between these two sets of charges? (ke = 8.99 × 10^9 N·m2/C2)
a. 5.1E+11 N
b. 1.3E+20 N
c. 5.1E+5 N
d. 2.0E+9 N
e. 3.2E+13 N
c
Physics & Space Science
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The half-life of a muon is 2.2 ?s. How fast is it moving relative to an observer who says its half-life is 4.4 ?s?
a. 0.87 c b. 0.75 c c. 0.97 c d. 0.72 c e. 0.50 c
Physics & Space Science
Thermal Expansion: For the mercury in a thermometer to expand from 4.00 cm3 to 4.10 cm3, what change in temperature is necessary? The mercury has a volume expansion coefficient of 1.80 × 10-4 K-1.
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Physics & Space Science
Venus is very hot because its atmosphere is rich in carbon dioxide
a. True b. False Indicate whether the statement is true or false
Physics & Space Science