A reservoir dam has a vertical surface in contact with the water that is 125 m wide and 11.0 m high. Air pressure is one atmosphere. If the reservoir is completely filled, determine the magnitude of the net force acting on the dam. (Hint: Since the pressure varies linearly with depth, you will need to use your knowledge of calculus in order to determine the force on the dam due to water. Use 1.00 ✕ 103 kg/m3 for the density of water.)

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

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

What is the difference between mass density and weight density?