The luxury liner queen elizabeth 2 has a diesel-electric powerplant with a maximum power of 90 mw at a cruising speed of 31.5 knots. what forward force is exerted on the ship at this highest attainable speed? (1 knot = 0.514 m/s. mw = megawatts)

The velocity of a car traveling in a straight line increases from 0 meters/second to 30meters/second in 8 seconds. what is the average acceleration of the car?

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?

What is reflection, what is refraction, and what is diffraction. what some similarities or differences between the three.