A heater is placed along the side of an aquarium. A convection current will transfer heat throughout the aquarium as___. A. Hot water rises and cold water sinks

B. Hot water sinks and cold water rises

C. Hot water spreads from the heater in all directions

D. Water rises and sinks in an ever-changing pattern

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?