Which of these would be LEAST useful if one is attempting to create a electromagnet? A) battery B) iron nail C) distilled water D) coil of copper wire

una nadadora quiere cruzar un rio de 100 m de anchura en dirección perpendicular a la corriente, pero llega a un punto de la orilla opuesta 20m aguas abajo. Calcula la velocidad de la corriente si ella va a 2 m/s

Suppose that at room temperature, a certain aluminum bar is 1.0000 m long. The bar gets longer when its temperature is raised. The length l of the bar obeys the following relation: l=1.0000+2.

A proton moving at 2.5 * 10^3 m/s horizontally enters a region where a magnetic field of 0.42 T is present, directed vertically upward. What magnitude and direction of force acting on the proton due to this field? (e = 1.60 * 10^-19 C)

The atomsphere is composed of several gas which is present in the largest quantity is A. carbon dioxide B. nitrogen C. oxygen D. water vapor

A negative acceleration means that the speed of the object decreases. Explain why this statement can be incorrect?

The amount or the strength of force is called its

An airplane in flight has a pressure difference between the lower and upper wing surface; this provides an upward force that balances the weight of the plane.

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Why does momentum have a direction?

What is the difference between weight and mass?