Simple molecules containing only carbon and hydrogen are referred to as

A) carbon hydrides
B) hydrocarbons
C) carbohydrides
D) hydrogen carbides


B

Physics & Space Science

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Why are lunar eclipses more commonly seen than solar eclipses?

A) Lunar eclipses occur at night and are easier to see. B) The Moon goes around the Earth faster than the Earth goes around the Sun. C) Earth casts a bigger shadow than the Moon. D) The tilt of the Moon's axis is smaller than the Earth's. E) The Moon is much closer to Earth than to the Sun.

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A normal force

A. is any everyday force B. is the gravitational force C. acts perpendicular to the surface D. is always equal to the weight of an object.

Physics & Space Science

For very small objects at very low speeds, the drag force is directly proportional to the magnitude of the velocity. The proportionality constant depends on

A) the viscosity of the fluid. B) the size of the object. C) the shape of the object. D) all of the above choices. E) none of the above choices.

Physics & Space Science

Electric Field of Point-Charges: The figure shows two unequal charges, +q and -Q. Charge -Q has greater magnitude than charge +q. Point X is midway between the charges. In what section of the line will there be a point where the resultant electric field is zero?

A. VW B. WX C. XY D. YZ

Physics & Space Science