Apoint charge is used to determine the electric field around a charged particle. why is it necessary that the point charge does not affect the position of the charge being tested? a) the amount of charge will increase if the charged particle moves closer to the point charge, so any change in position changes the field. b) the amount of charge will decrease if the charged particle moves closer to the point charge, so any change in position changes the field. c) electric fields are inversely proportional to the square of the distance, so any change in position changes the field. d) electric fields are directly proportional to distance, so any change in position changes the field.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 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. 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.

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

If the new moon happens on january 15th, what shape will it be on february 6th?