Which element, represented by x, reacts with fluorine to produce the compound xf2? (1) aluminum (3) calcium (2) argon (4) sodium

A car moving south speed up from 10 m/s to 40 m/s in 15 seconds. What is the card acceleration?

Why are all machines not 100% efficient A. Mass B. Gravity C. Friction D. Distance

Science differs from other disciplines, such as history and the arts, because science relies on

Light that has passed through a polarizing filter is called a. transverse light. b. polarized light. c. white light. d. photoelectric light.

It is the thermal energy transferred from a hot object to a cold object.

The liquid contained in batteries that conducts electric charge is called the: solution, electrolyte, suspension, colloid

Someone jumped from a high altitude at 31,000m above the earth. he freefalled for 4 min and 36 secs with top speed of 988 mph

What does the law of reflection mean?

Compared with the peak wavelength given off by the sun, what is the peak wavelength given off by a hotter star? A.) shorter in wavelength and higher in energy B.) shorter in wavelength and lower in energy C.

4. Explain the doppler effect. Be sure to talk about how the wave changes, the perceived change hear by a person that an emitted sound is moving towards, and the perceived change hear by a person that an emitted sound is moving away from. 5.