Athin insulating rod is bent into a semicircular arc of radius a, and a total electric charge q is distributed uniformly along the rod. calculate the potential at the center of curvature of the arc if the potential is assumed to be zero at infinity. (use any variable or symbol stated above along with the following as necessary: îµ0.)

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.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults