Which spheres are interacting when a volcano erupts and releases gases into the air.

When tuning a guitar, by comparing the frequency of a string that is struck against a standard sound source (of known frequency), what does the one adjusting the tension in the string listen to?

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground A. True or B. False

As a battery is used to charge a capacitor, does the overall charge inside the battery get smaller, greater, or stay the same?

What is the main driver of the water cycle

which words are readable red word on white paper in red light or blue words on white paper in blue light

A building 190 feet tall casts a 30 foot long shadow. if a person stands at the end of the shadow and looks up to the top of the building, what is the angle of the person's eyes to the top of the building (to the nearest hundredth of a degree) ?

The frequency of which type of electromagnetic wave is just higher than that of visible light? A. infrared waves B. gamma rays C. x-rays D. radio waves E. ultraviolet rays

Two circular coils are concentric and lie in the same plane. The inner coil contains 140 turns of wire, has a radius of 0.015 m, and carries a current of 7.2 A. The outer coil contains 180 turns and has a radius of 0.023 m.

Which best describes how magnesium (mg) and oxygen (o) bond? they form an ionic bond by exchanging two electrons. they form an ionic bond by exchanging three electrons. they form a covalent bond by sharing one electron.

The coefficient of linear expansion of steel is 12 * 10-6 k-1. what is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 k from winter to summer? a. 1.2 cm b. 1.8 cm c. 1.4 cm d. 2.0 cm e. 1.6 cm