When air is blown across the top of an open

water bottle, air molecules in the bottle vibrate

at a particular frequency and sound is produced.

This phenomenon is called

(1) diffraction (3) resonance

(2) refraction (4) the Doppler effect

Copernicus's heliocentric model and Ptolemy's geocentric model were each developed to provide a description of the solar system. Both models had advantages that made each an acceptable explanation for motions in the solar system during their time.

A portable television using a 12 volt, 3 Ah rechargeable battery can operate for a period of about 6 hours. What is the average current drawn in amperes during this period

You just competed in a track meet and you ran the 1500 m race in 484 seconds. what was your average speed in miles per hour?

The concentration of the appetite-regulating hormone ghrelin is about 1.3 * 10-10 M in the blood of a fasting person. How many molecules of ghrelin are in 1 L of blood? a) 2.2 * 10-34b) 1.3 * 10-10c) 7.8 * 1013d) 4.6 * 1033

Which statements accurately describe Earth's magnetic field? Check all that apply. The magnetic field lines flow from Earth's geographic South Pole to Earth's geographic North Pole. The magnetic field is created by magnetic rocks on the surface.

How Long will it take a plane flying north from Miami to reach New York City 1800 km away if the average velocity of the plane is 940 km/h

If vector A = 5.5N NE and vector B = 10m N 30° W, what is the vector product of A*B

Which is the best desciption of a molecule?

What are those that you are wearing?

What Science is/is not and How Physics and Chemistry are Connected