A rowboat heads directly across a river at a speed of 3 m/s. Select the correct equations that show that if the river flows at 4 m/s, the speed of the boat relative to the riverbank is 5 m/s.

If the speed of a particle triples ,by what factor does its kinetic energy increase?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

The electric field direction is defined by the direction of the force felt by (select one of the following answers): 1. a negative charge. 2. a positive charge. 3. both positive and negative charges.