Consider a jet on the deck of an aircraft carrier. In order to take off, a catapult is attached to the jet and it is flung off the deck. An F-18 has a gross weight of approximately 17,000 kg and must reach speeds of about 270 km/hr by the end of the 150 m deck. The catapults on aircraft carriers must be able to launch a variety of aircraft that have different masses and minimum airspeeds for a flight! How would you ensure that you provide enough energy to the aircraft to get it safely off the deck of the aircraft carrier?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

The softest and hardest minerals are: softest hardest