Sharpening a pencil leaves behind pencil shavings. is sharpening a pencil a physical change or a chemical change

A source emits sound with a frequency of 16246 Hz. Both it and an observer are moving toward each other, each with a speed of 141 m/s. What frequency (in Hz) does the observer hear?

How many constellations does the international astronomical union recognize?

Match the term to its definition. A. Conduction Heat flowing when a liquid or gas carries the heat B. Convection Heat flowing between two objects that are touching each other C. Radiation Heat flowing in waves

What are the pros and cons of nuclear fission

A flashlight beam is directed at a swimming pool in the dark at an angle of 46° with respect to the normal to the surface of the water. What is the angle of refraction of the beam in the water? (The refractive index for water is 1.33.)

Which of the following is not characteristic of a thunderstorm? a. strong updrafts b. strong winds c. rain and snow at intermediate altitudes of the cloud d. small raindrops e. potentially large hailstones

Wispy, feathery clouds made mostly of ice crystals that form at high altitudes, usually above 6 kilometers.

Household appliances covert electricity into one or more different Forms of energy. A television can best be described as converting electricity into: A) heat energy B) heat energy and sound energy C) heat energy and light energy D) heat energy,

A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed? a. 50 mm/s b. 50 hertz's c. 2 mms d. 0 0.50 mms

What is the processing of information and other input into your memory called? A. Sensory representation B. Encoding C. Storage D. Conditioning