Two resistors In circuit 1 (see the figure), ohmic resistor R, dissipates 9 watts; in circuit 2, ohmic resistor R, dissipates 23 watts. The wires and batteries have negligible resistance. The circuits contain 10V batteries. Circuit 1 Circuit 2 10 V 10 V (a) What is the resistance of R, and of R2? R1 = R2= (b) Resistor R, is made of a very thin metal wire that is 3 mm long, with a diameter of 0.1 mm. What is the electric field inside this metal resistor? V/m (c) The same resistors are used to construct circuit 3, using the same 10V battery as before. OV Circuit 3

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.