(100 points)four identical positive chargesqare located on corners of a plastic square of widtha. theorigin is located at the center of a rectangular as indicated in the diagram. the plastic square is neutral and thepolarization of the plastic can be ignored in this problem. a. how many total electrical forces are there present on all four charges, counting each nonzero force exertedby a particle on a particle as a separate force. b. what is the total net force on the system of four charges? briefly explain how you know this. c. calculate the magnitude of the force on charge in the lower-left-hand corner. d. what is the magnitude of the net electric field farr > > afrom the square?

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

An alligator swims to the left with a constant velocity of 5 \,\dfrac{\text{m}}{\text s}5 s m ? 5, space, start fraction, m, divided by, s, end fraction. when the alligator sees a bird straight ahead, the alligator speeds up with a constant acceleration of 3 \,\dfrac{\text {m}}{\text s^2}3 s 2 m ? 3, space, start fraction, m, divided by, s, start superscript, 2, end superscript, end fraction leftward until it reaches a final velocity of 35 \,\dfrac{\text {m}}{\text s}35 s m ? 35, space, start fraction, m, divided by, s, end fraction leftward. how many seconds does it take the alligator to speed up from 5 \,\dfrac{\text {m}}{\text s}5 s m ? 5, space, start fraction, m, divided by, s, end fraction to 35 \,\dfrac{\text {m}}{\text s}35 s m ? 35, space, start fraction, m, divided by, s, end fraction?

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these