Ablock moves at 5 m/s in the positive x direction and hits an identical block, initially at rest. a small amount of gunpowder had been placed on one of the blocks. the explosion does not harm the blocks but it doubles their total kinetic energy. after the explosion the blocks move along the x axis and the incident block?

An object's buoyant force and weight mean the same thing.a. trueb. false

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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.