Electrons orbit an atomic nucleus like planets orbit the Sun
Indicate whether the statement is true or false
FALSE
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A device that has a very small resistance to current flowing in one direction but very high resistance to current flowing in the opposite direction is a ________.
Fill in the blank(s) with the appropriate word(s).
The lowest point in the potential energy curve on an energy diagram is
A. The turning point B. Point of smallest total energy C. Point of largest total energy D. Point of largest velocity
A 2-hp motor can do the same amount of work as a 1-hp motor in ______________ the time. n
Fill in the blank(s) with correct word
A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the change in frequency (in Hz) heard by an observer in the truck as the two vehicles pass each other? (The speed of sound in air is 343 m/s.)
a. 242 b. 238 c. 240 d. 236 e. 234