An explosion occurs at the end of a pier. the sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. the speeds of sound in air, water, and the handrail are 339, 1480, and 5060 m/s, respectively. the sound travels a distance of 141 m in each medium.

(a) after the first sound arrives, how much later does the second sound arrive?
(b) after the first sound arrives, how much later does the third sound arrive?

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.

What is the coefficient of kinetic friction μk between the block and the tabletop?

Which additional product balances the reaction h2so4 + 2naoh → na2so4 + 2h2o 2oh h2o2 h3o