Involves the transformation of chemical energy directly into light energy?

A microwave oven operating at 120 volts is used to heat a sandwich if the oven draws 12.5 amperes of current for 45 seconds what is the power dissipated by the oven?

A soil sample contains 55 percent sand, 25 percent clay, and 20 percent silt. What type of soil is present in the sample? a. clay b. silty loam c. silty clay loam d. sandy clay loam

On the seashore, pebbles that are rough and uneven become smooth and rounded. Explain how the become smooth and rounded.

Assuming that a person can pull 100 kilograms, how many people would have been required to pull a 50,000 kilogram lintel (upright) stone in the building of Stonehenge?

Find a numerical value for rhoearth, the average density of the earth in kilograms per cubic meter. Use 6378km for the radius of the earth, G=6.67*10-11m3 / (kg⋅s2), and a value of g at the surface of 9.80m/s2.

describe the relationship that exists between amplitude of a wave and the amount of energy that the wave carries

Recognize the relationship between stiffness of the medium and the speed of a wave.

Which of the following describes density only in terms of metric units? a. kilograms per cubic meter b. pounds per square meter c. pounds per cubic foot d. grams per cubic foot

A child drops a ball from a window. The ball strikes the ground in 3 seconds. What is the velocity of the ball the instant before it hits the ground?

Lc circuit consists of a 20.0 mh inductor and a 0.150 µf capacitor. if the maximum instantaneous current is 0.400 a, what is the greatest potential difference across the capacitor?