As the ambulance got closer, Marge noticed that the pitch of the siren got higher. This happened because

The total energy in a system is 675 J. The kinetic energy changes from 296 to 432 J. Which statement best describes the potential energy of this system?

What is the normal frequency for humans

What happens when a mechanical wave travels through a medium? Energy fluctuates. Energy is transferred. Energy is lost. Energy is gained.

A car of mass 1500 kg travels due East with a constant speed of 25.0 m/s. Eventually it turns right, and travels due South with a constant speed of 15 m/s. By making the turn, and reducing its speed, the car's linear momentum changed.

How should scalar symbols be written? A. in bold type B. in italic type C. with an arrow on top D. in bold type or with an arrow on top

What has become an important alternative to Piagetian approaches?

How would life on earth be different if earth's axis were not tilted with respect to its orbit? A. There would be no seasons. B. There would be no day and night. C. All places would have the same climate. D. The seasons would be much shorter.

What will a spring scale read for the weight of a 75.0-kg woman in an elevator that moves upward with constant speed of 5.8 m/s?

What's the definition of: • cellular respiration • photosynthesis

What are the steps that are important to take for your safety during an earthquake? a. stay away from walls and windows c. stay away from electrical and gas lines b. get under a desk or table d. all of the above