Sound waves in air are a series of

a. periodic disturbances.

b. periodic condensations and rarefactions.

c. high - and low-pressure regions.

d. all of the above E. none of the above

A wave has a speed of 30 m/s and a wavelength of 3 meters. Calculate its frequency.

The part of a circult that increases the electric potential of the electrons is the

Make a list of possible consequenes of solar flares to the following members of your community

Which type of energy is stored in a stretched string on the bow in the following figure

A uniform rod is pivoted at its center. It is acted on by two forces in the plane. Each force has the same size, equal to 10N (newtons). In which case is there a turning effect?

Which transformation of energy occurs in a hydroelectric power plant? A. Potential energy to chemical energy B. Chemical energy to potential energy C. Chemical energy to Kinetic energy D. Kinetic energy to electrical energy F.

Which two supreme court cases delt with the first amendment rights of students in public schools

Two boxes sit on a frictionless surface and are in contact with one another. the first box has a mass of 7 kg and the second box has a mass of 8 kg. A 25 N force is applied to the 7 kg box. Find the acceleration of the boxes.

Which pharaoh ordered the use of millions of man hours and extraordinary resources to create the Great Pyramid at Giza? A) Amenhotep B) Khufu C) Menes D) Tutankhamen

5. The group number of the carbon family is: a. 1 b. 2 C. 3 d. 4