Aball is moving at 4.5 m/s and has a momentum of 75 kg. m/s what is the balls mass

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

When an object is heated it contracts. a. true b. false

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.