The units of work are the same as those of ______________
Fill in the blank(s) with correct word
energy
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A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/sec. What is the approximate age of this planetary nebula? (1 pc is equal to 3 x 1013 km and 1 year is equal to 3.15 x 107 seconds.)
a. 240 years b. 790,000 years c. 96,000 years d. 960 years e. 24,000 years
A motor with a coil resistance of 12.4 ? is attached to a voltage supply of 66.4 V. What is the current in the motor when it is running at its maximum speed with a back emf of 22.6 V?
a. zero b. 3.53 A c. 7.18 A d. 5.35 A e. 543 A
Three identical capacitors are connected in series across a potential source (battery). If a charge of Q flows into this combination of capacitors, how much charge does each capacitor carry?
A) 3Q B) Q C) Q/3 D) Q/9
A proton is moving in an electric field. The direction of the acceleration of the proton is
A. in the direction the proton is moving. B. opposite the direction the proton is moving. C. perpendicular to the direction the proton is moving. D. in the direction of the electric field. E. opposite the direction of the electric field.