What does the theory of plate tectonics suggest?

Heather drops a ball weighing 0.50kg a distance of 2.0m. If the speed of the ball right after it bounces is the same speed of the ball right before it bounces, and the interaction time between the ball and the floor was 0.

The world record for the men's marathon, 42 km, is 2 hours and 3 minutes.

In the diagram, q1 = + 0.250 mC, q2 = - 0.180 mC, and q3 = + 0.400 mC. the net force on q2 is zero. how far is q2 from q3? (make sure you know the direction of each force!) (hint: milli means 10^-3.) (unit = m)

Positive psychologists believe that happiness can be increased by

A microscope is an instrument that makes distant objects look larger.

Choose all the answers that apply. The sun: - is the largest star in our solar system - is the largest star in our galaxy - is made mostly of hydrogen and helium -will eventually run out of fuel and die -creates energy through nuclear reactions

Calculate the kinetic energy of a truck that has a mass of 2900kg and is moving at 55m/s.

In the calorimetry experiment which energy will be calculated during the heat exchange if water is used?

A turtle, moving at a constant velocity of 0.9 m/s due south, is in a race with a rabbit, who runs at a moderate speed of 9 m/s.

What might cause a theory to change over time?