Three point charges, two positive and one negative, each having a magnitude of 20 mC are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on one of the positive charges?
a. 69 N
b. 40 N
c. 80 N
d. 57 N
e. 20 N
B
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Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
a.
bulb 1 glows more brightly.
b.
bulb 2 glows more brightly.
c.
both bulbs continue to glow with the same brightness.
d.
bulb 1 goes out.
e.
bulb 2 goes out.
Think of Bernoulli's equation as it pertains to an ideal fluid flowing through a horizontal pipe. Imagine that you take measurements along the pipe in the direction of fluid flow. What happens to the sum of the pressure and energy per unit volume?
a. It increases as the pipe diameter increases. b. It decreases as the pipe diameter increases. c. It remains constant as the pipe diameter increases. d. No choices above are valid.
The name of the transuranium element commonly used in smoke detectors is ______________
Fill in the blank(s) with correct word
Protons in the nucleus attract electrons with enough electromagnetic force to keep them in orbit at high speeds. Protons in general repel each other, but in the nucleus they are bound together. How is this possible?