Two current carrying wires are parallel to one another and separated by 2cm. If the distance between them is increased to 4cm the new force will be what factor times the original force?
a) 2 b) 4 c) ½ d) ¼ e) none of the above

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

Heat from the sun reaches earth to a. radiation b. convection c. conduction

Un jugador de beisbol batea un foul recto en el aire. la pelota deja el bate con una rapidez de 120 km/h. en ausencia de resistencia del aire. ? cual sera la rapidez de la pelota cuando la atrape el catcher