Superman stops a "speeding locomotive" of mass 8.0x103 kg in 4.0 seconds. If the train was originally moving at 40.m/s, a) what is the change in momentum?

b.) What is the magnitude of the force which Superman exerts on the train?

The heliocentric and the geocentric models of the solar system included these central principles

Ain is , is 's of ? 0.62 0.79 1.27 1.50

Consider two regions of space containing a static electric field, region a and region b. in region a the equipotential lines are more closely spaced than those in region b. what can be said about the relative strength of the electric field in the two regions? a) the electric field in region a is stronger th