Astraight, nonconducting plastic wire 9.50 cm long carries a charge density of 135 nc/m distributed uniformly along its length. it is lying on a horizontal tabletop.

a) find the magnitude of the electric field this wire produces at a point 4.00 cm directly above its midpoint.

b) find the direction of this electric field.

c) if the wire is now bent into a circle lying flat on the table, find the magnitude and direction of the electric field it produces at a point 4.00 cm directly above its center.

d) find the direction of this electric field.

In which of the following cases is work being done on an object? question 2 options: pulling a trailer up a hill carrying a box down a corridor suspending a heavy weight with a strong chain pushing against a locked door

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.