Isotopes of an element differ in their numbers of ______________
Fill in the blank(s) with correct word
neutrons
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High voltages are desirable for long distance transmission of electric power because
A. the higher the voltage the higher the current, which reduces the power lost B. the higher the voltage, the lower the current, which reduces the power lost C. the higher the voltage the less concern there is for safety
A 2000 kg car is traveling on a banked curved icy road without sliding. The velocity of the car is 30 m/s and the road is banked at an angle of 20.0 degrees. The radius of curvature of the road is
A. 175 m. B. 204 m. C. 252 m. D. 302 m. E. 375 m.
What temperature has the Big Bang has cooled to by now?
A) About 3,000 K B) 5,800 K C) About 300 K D) Just over 2.7K E) 1.4 K
A vibrating diatomic molecule in its ground state has energy E. What is the energy of the same molecule in its second EXCITED state?
A) 2E B) 3E C) 9E D) E E) 5E