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Sam is standing in an empty auditorium. He yells and hears his voice echo. What is happening to the sound to cause this echo?

An electric field exerts a force of 3.00 E - 4 N on a positive test charge of 7.20 E-4 C. The magnitude of the field at this location of the charge is a) 0.24 N/C b) 0.417 N/C c) 15.6 N/C d) 21.6 N/C e) 2.4 N/C

What causes water to become denser when it is carried to the poles by surface currents

What is our main source of electromagnetic energy?

A pulley system is used to lift a crate weighing 150 newtons straight up. If the force applied is 87 newtons and the ideal mechanical advantage of the pulley system is 2, what is the percentage efficiency of the pulley system?

What shape marks the pegasus constellation?

Gerry is looking at salt under a powerful microscope and notice a crystalline structure. what can be known about the salt sample that Gerry is looking at

The kinetic energy of a moving object is equal to the work required to bring it to its speed from rest, or the work the object can do while being brought to rest.

Imagine standing on a bathroom scale and reading your weight. now lift one foot and read your weight again. does the scale read more, less or the same weight when you are standing on one foot?

The period T of a simple pendulum depends on the length L of the pendulum and the acceleration of gravity g (dimensions L/T^2). (a) Find a simple combination of L and g that has the dimensions of time.

What is an example of the theory that the best adapted organisms for an environment are the ones most likely to survive