Observations of spiral galaxy show a major axis of 1.5x105 ly and a minor axis equal to 80% of the major axis. if the radial velocity of a gas cloud located in the spiral arms is calculated at 156 km/s, what is the true rotational velocity of the cloud?

Awheel rotates without friction about a stationary horizontal axis at the center of the wheel. a constant tangential force equal to 82.0 n is applied to the rim of the wheel. the wheel has radius 0.150 m . starting from rest, the wheel has an angular speed of 12.8 rev/s after 3.88 s. what is the moment of inertia of the wheel?

Aballet student who learns with the of his instructor is demonstrating learning.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force