True or false: for a low-pressure system to strengthen, the surface air pressure must decrease. select one:
a. true
b. false

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Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)