If you run up the stairs (and don't fall) which of the following would be true?
a. you would not have followed the directions.
b. the work you did would be more than the work done when you walked carefully up the stairs.
c. the power developed would be less than the power for walking.
d. the power would be greater than if you walked.
e. both a and b
f. both b and c
g. both a and d
h. all of the above
i. none of the above

Ms. hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.

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.

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?