Ashopping cart slows as it moves along a level floor. which statement describes the energies of the cart?
(1) the kinetic energy increases and the gravitational potential energy remains the same.
(2) the kinetic energy increases and the gravitational potential energy decreases.
(3) the kinetic energy decreases and the gravitational potential energy remains the same.
(4) the kinetic energy decreases and the gravitational potential energy increases.

Gunpowder residue is most likely to show up where on a shooters hands

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?