What happens to water when it changes to ice?

its density increases.

its density decreases.

its mass increases.

its mass decreases.

its volume increases.

its volume decreases.

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

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.

Which sound characteristic is not affected by the relative motion of an object