A long line carrying a uniform linear charge density +50. 0μc/m runs parallel to and 10. 0cm from the surface of a large, flat plastic sheet that has a uniform surface charge density of −100μc/m^2 on one side. Required:
a. Find the location of all points where an α particle would feel no force due to this arrangement of charged objects.
b. Choose an appropriate location of these points at a distance calculated in part A.

1. above the line
2. between the line and the sheet.

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity

The electric field direction is defined by the direction of the force felt by (select one of the following answers): 1. a negative charge. 2. a positive charge. 3. both positive and negative charges.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?