An artillery shell has a mass of 8 kg. The shell is fired from rest at one end of the barrel of a gun. The shell exits the barrel with a speed of 700 m/s. The gun barrel is 3.5 m long.
What is the net force on the shell while it is in the gun barrel?

What can you increase the strength of an electromagnet by

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

Acapacitor is storing energy of 3 joules with a voltage of 50 volts across its terminals. a second identical capacitor of the same value is storing energy of 1 joule. what is the voltage across the terminals of the second capacitor?