A motor has an internal resistance of 12.0 ?. When running, the motor has a back emf of 29 V and draws a current of 3.7 A. What is the supply voltage in this case?
a. 29 V
b. 44 V
c. 73 V
d. 15 V
e. 32 V
c
Physics & Space Science
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________ are hot compact stars whose mass is comparable to the Sun's and size to Earth's.
A. Neutron stars B. Pulsars C. White dwarfs D. Black holes
Physics & Space Science
A proton moving at 3 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is directed downwards, how long does it take the proton to return to the horizontal plane? (HINT: Ignore gravity.) [mProton = 1.67 × 10^?27 kg, qProton = +1.6 × 10^?19 C.]
Physics & Space Science
Which type of quantity is characterized by both magnitude and direction?
a. scalar c. trigonometric b. vector d. algebraic variable
Physics & Space Science
Is the cosmological red shift really a velocity of a given galaxy?
What will be an ideal response?
Physics & Space Science