A spring is stretched 2.0 cm. If the same spring is stretched 8.0 cm the ratio of the second and first potential energies of the spring is

16

9

4

1

When is thermal equilibrium achieved between two objects? A. when the particles in one object have more kinetic energy B. when one objects is hotter than the other C. when both objects have the same temperature

A student performed an experiment to test the acidity of foods. Put the following steps in the order they should occur. The student records the acidity of the food. asks a question about food's acidity.

To qualify to run in the 2005 boston marathon, a distance of 26.2 miles, an 18-year-old woman had to have completed another marathon in 3 hours and 40 minutes or less. to qualify, what must a woman's average speed have been in miles per hour?

What causes an electric charge? Question 1 options: The movement of electrons due to a difference in electric potential energy The movement of protons due to a difference in electric potential energy The movement of neutrons due to a waterfall The

If the forces acting on an object are balanced, the object may change speed, change direction, or do both. true or false.

What is your acceleration? 1) 4 m/s 2) 5 m/s 3) 3 m/s 4) 2 m/s

If the mass of a material is 46 grams and the volume of the material is 7 cm^3, what would the density of the material be?

Two balls have the same mass. One ball moving along the positive x axis and the other ball moving along the positive y axis undergo perfectly inelastic collision. What can you say about the motion of the balls after the collision? A.

The back wall of an auditorium is 30.0 m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall?

Your town has decided to build a new power plant to replace the old coal burning plant. Suggest a renewable resource that they could use to generate power. Describe two advantages and two disadvantages of the resource you have recommended.