Aroller coaster car of mass m is on a track that forms a circular loop of radius r in the vertical plane. if the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its speed at that point?

When a resistor with resistance r is connected to a 1.50-v flashlight battery, the resistor consumes 0.0625 w of electrical power. (throughout, assume that each battery has negligible internal resistance.) what power does the resistor consume if it is connected to a 12.6-v car battery? assume that r remains constant when the power consumption changes.

In a load, the load is paralel to the shaft. n a. angular n b. thrust n c radial n d. none of the above

In science and physics what is the standard unit of measure for speed?