A ball is thrown directly upwards. Is there a point of trajectory where the ball has zero acceleration

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.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created