A 150-kg football player collides head-on with a 75-kg running back. During the collision, the heavier player exerts a force of magnitude FA on the smaller player. If the smaller player exerts a FB force back on the heavier player, which response is most accurate: a. FB= FA
b. FB< FA
c. FB> FA
d. FB=0
e. We need more information

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.