Two point charges of + 30.0 ?C and - 9.00 ?C are separated by a distance of 20.0 cm. A +7.00 ?C charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges?
A) 0.453 N directed towards the negative charge
B) 2.45 N directed towards the negative charge
C) 2.45 N directed towards the positive charge
D) 245 N directed towards the positive charge
E) 245 N directed towards the negative charge
E
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An engine takes in 150 J energy from a 400 K thermal source. If the engine discharges energy into a thermal reservoir at 150K, then what is the maximum amount of work one can get out of the engine?
A. 93.8 J B. 84.2 J C. 28.5 J D. 168 J
Which eukaryotes break down food externally and then absorb nutrients?
a. bacteria b. plants c. fungi d. animals e. protists
To have a negative ion, you must have:
A) taken away a proton from the nucleus. B) added a positron to the nucleus. C) added a positron to the outer electron shell. D) added an electron to the outer electron shell. E) None of these; only positive ions can exist in nature.
__________ radiation causes your skin to tan
Fill in the blank(s) with correct word