Rank-2 tensors a charge q moves with a constant velocity u - ux. define the antisymmetric tensor rue by ημχν-ηνζ), w 4. rank-2 tensors a charge q moves with a constant velocity u = uˆx. define the antisymmetric tensor r µν by r µν ≡ 1 c (η µx ν − η νx µ ), where η µ is the four velocity of the charge. further define r 2 = −r µνrµν/2. (a) show that r 2 = (x−ut) 2 1−u2/c2 + y 2 + z 2 . (b) show that the electric field produced by the charge is given by en/c = q 4π r 0n (r 2) 3/2 , where the subscript n refers to the x, y or z component of e.

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j. b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.