As the moon revolves around the earth, it also rotates on its axis. why is it that the same side of the moon is always visible from earth? a. the speed of the moon's rotation keeps the same side always facing earth. b. the earth's gravity attracts one side of the moon more than the other. c. that side of the moon only faces away from earth during the daytime. d. the moon does not have a day and night cycle.

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

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.