Karen is creating a presentation about the moon. Every night for a month, Karen observes the moon and records what it looks like.

Karen notices that the moon changes shape slightly each night, and by the end of the month she has recorded a variety of shapes. What are the different shapes of the moon called?

A. crescents
B. gibbous
C. patterns
D. phases

To create electromagnetic induction, which of the following has to move? a. a wire b. a magnet c. a transformer d. either a or b

What is the temperature in degrees celsius of a substance with a tempature of 49k

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.