Dos cargas puntuales están fijas en el eje x: 1 = 6.0 C está localizada en el origen, con 1 =
0.0 , y 2 = −3.0 C está ubicado en el punto
2 = 8.0 .

El punto sobre el eje x donde debe colocarse una
tercera carga 3 para que la fuerza electrostática que
actúe sobre ella sea cero es
. 19
. 8.0
. 27
. −19

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

Energy flows from the producer level to the level. is called

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.