Two particles, each having a mass of 3.0 mg and having equal but opposite charges of magnitude 5.0 nC, are released simultaneously from rest when the two are 5.0 cm apart. What is the speed of either particle at the instant when the two are separated by 2.0 cm?
a. 2.1 m/s
b. 1.5 m/s
c. 1.8 m/s
d. 2.4 m/s
e. 3.2 m/s
B
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A galvanometer has an internal resistance of 100 ? and deflects full-scale at a current of 2.00 mA
What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV, and how should this resistor be connected to the galvanometer? A) 50.0 ? in series with the galvanometer B) 50.0 ? in parallel with the galvanometer C) 75.0 ? in parallel with the galvanometer D) 100 ? in series with the galvanometer E) 100 ? in parallel with the galvanometer
Jovian planets are found in the inner solar system
a. True b. False Indicate whether the statement is true or false
Escape Speed: Planet A has twice the mass of Planet B. From this information, what can we conclude about the escape speed for Planet A compared to that of Planet B?
A. The escape speed for Planet A must be twice as great as the escape speed from Planet B. B. The escape speed for Planet A must be four times as great as the escape speed from Planet B. C. The escape speed for Planet A is the same as the escape speed from Planet B. D. The escape speed for Planet A is greater than the escape speed from Planet B, but we cannot say how much greater. E. We cannot conclude anything about the escape speed for Planet A without knowing the radii of the two planets.
An 8.00-? resistor is connected to a battery with internal resistance of 0.200 ?. If the terminal voltage across the battery is 9.00 V, what is the battery's emf?
a. 8.78 ? b. 9.23 ? c. 0.225 ? d. 0.178 ?