cr0sh:
you need to understand how torque works (it's measured in a variety of ways - generally ounce-inch/inch-ounces, pound-inches/inch-pounds, pound-feet/foot-pounds, gram-centimeters, kg-centimeters, etc).
Arrgh! The scourge of imperial units! its easier to use newton-metres - convert to the SI units immediately and do all your
working in SI units for a sane life - then the only constants you have to memorise are 2 Pi (and 60 to convert rpm to Hz).
Power = torque x angular-velocity (in N-m and rad/s)
= torque x 2 x pi x (60 x RPM)
And with SI units the forces needed to accelerate a mass are easy to calculate too:
force = mass x acceleration (N, kg, m/s^2)