If its parallax is 1", then the distance to the star is ________ light-years
Fill in the blank(s) with correct word
3.3
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Kirchhoff's Rules: In the circuit shown in the figure, R1 = R2 = 90.0 ?, R3 = R4 = 20.0 ?, V1 = 7.0 V, V2 = 8.0 V, and the batteries are both ideal. What current does the ammeter read?
A. 0.40 A B. 0.050 A C. 0.83 A D. 0.056 A
An observer traveling with speed 0.5c moves directly toward a beacon emitting photons with speed c in her direction. The observer measure the speed approaching photons to be
(a) 0.25c (b) 0.5c (c) c (d) 1.5c
A particle (charge = 50 ?C) moves in a region where the only force on it is an electric force. As the particle moves 25 cm from point A to point B, its kinetic energy increases by 1.5 mJ. Determine the electric potential difference, VB?VA.
A. ?50 V B. ?40 V C. ?30 V D. ?60 V E. +15 V
Two pipes are smoothly connected together without leaks. One has a diameter of 3 cm and the other has a diameter of 5 cm. Water flows through the pipes. In which pipe is the flow speed the greatest?
1.in the pipe that the water flows through first (the "upstream" pipe) 2.in the 3 cm pipe 3.in the 5 cm pipe 4.in neither, the flow rate is the same in both pipes