What kind of energy is the source of the light and heat produced by a burning log?

chemical energy

kinetic energy

gravitational energy

electrical energy

An engine flywheel initially rotates counterclockwise at 6.69 rotations/s. Then, during 20.1 s, its rotation rate changes to 2.65 rotations/s clockwise.

Why is star formation more likely to occur in cold molecular clouds than in regions where the temperature of the interstellar medium is several hundred thousand degrees?

Two sections, A and B, are 0.5 km apart along a 0.05 m diameter rough concrete pipe. A is 115 m higher than B, the water temperature is 4 °C, and the pressure heads measured at A and B are 21.7 m and 76.1 m, respectively.

Why is a hollow chamber with a small hole in it a good approximation a blackbody? Question about this: is the small hole what makes the chamber hollow?

What describes how fast an object is moving and in what direction

Which will have the greatest effect on power consumption A.) add more circuit brakes and fuses B.) turn on all electric devices in a circuit C.) turn on only the electrical devices that use the most watts D.

13. Which best summarizes the change in number and size of microcontinents during the Proterozoic? a. the number of microcontinents increased and the size increased b. the number of microcontinents increased and the size decreased c.

What is the 3d model of oxygen molecule

If you need to drive from Dallas, Texas, to Salt Lake City, Utah, (about 1500 miles), and the speed limit is 60 miles per hour most of the way, what is the least amount of time you will need? A. 4 hours B. 25 hours C. 2.5 hours D. 90,000 hours

Which of the following statements about the Coriolis effect is correct? a. The Coriolis effect is not affected by wind speed. b. The Coriolis effect is weakest at the poles. c. The Coriolis effect does not affect wind direction. d.