2. How do the interference patterns produced by a CD and diffraction grating compare? Explain similarities, differences, and causes in your answer.

How much heat is needed to raise the temperature of 5g of water by 16°c?

Multiple choice. choose the one alternative that best completes the statement or answers the question. 1) if the force on an object is in the negative direction, the work it does on the object must be 1) a) negative. b) positive. c) the work could be either positive or negative, depending on the direction the object moves. 2) a truck has four times the mass of a car and is moving with twice the speed of the car. if kt and kc refer to the kinetic energies of truck and car respectively, it is correct to say that 2) a) kt = 16kc . b) kt = 1 2 kc. c) kt = kc . d) kt = 2kc . e) kt = 4kc . 3) you and your friend, who weighs the same as you, want to go to the top of the eiffel tower. your friend takes the elevator straight up. you decide to walk up the spiral stairway, taking longer to do so. compare the gravitational

Suppose that she pushes on the sphere tangent to its surface with a steady force of f = 40 n and that the pressured water provides a frictionless support. how long will it take her to rotate the sphere one time, starting from rest?