When a .22-caliber rifle is fired, the expanding gas from the burning gunpowder creates a pressure behind the bullet. this pressure causes the force that pushes the bullet through the barrel. the barrel has a length of 0.61 m and an opening whose radius is 2.8 x 10²³ m. a bullet (mass = 2.6 x 10²³ kg) has a speed of 370 m/s after passing through this barrel. ignore friction and determine the average pressure of the expanding gas.

Why does lightning travel from clouds to the ground?

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction

What is the largest meteoroid that has collided with this planet