Determine the max RPM of the reaction wheel and of the spacecraft. Approximate the RW4 wheel as a squat cylinder, with 80% of the mass of the RW4 is in the wheel and the diameter of the wheel is 92% of the RW8 diameter.

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

What are the three ways that an object can accelerate