Which situations contain unbalanced forces? Check all that apply.

A book rests on a table.
A book falls to the floor.
A car skids to a stop.
A duck floats on a pond.
A balloon hangs in midair.
A foam ball launches from a spring.

Which is not true about oxygen-17 and oxygen-18?

Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest.2000 kg car going 5m/s500 kg car going 20 m/s1000 kg car going20m/s500 kg car going10m/s1000 kg car going10/s4000 kg car going 5m/s 0 0 603

Four 5-gram blocks of metal are sitting out in the sun and absorb the same amount of heat energy. use the following specific heat capacity data to determine which block will increase its temperature the most.