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

A (n) 1.7 kg skateboard is coasting along the pavement at a speed of 2.33 m/s when a (n) 0.915kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination? Answer in units of m/s.

Which of the following laws best define this statement? the total amount of energy in a closed system stays the same.

jennys history teacher always sets the tempature in her classroom very low jenny always shivers when she is in class because she is cold now as jenny approaches the classroom she starts to shiver

Which of the following sources of energy is not renewable? wind energy wave energy solar energy

Which of the following is a positive statement? a) A humidity level of 90 percent is too high. b) It is too hot to run outside when the temperature exceeds 80 degrees. c) The temperature is 92 degrees today.

Nikolas, the fire extinguisher, and the skateboard have a combined mass of 50 kg. What force would the fire extinguisher have to produce to propel Nikolas if he wanted to accelerate at a rate of 1.

A set of data is collected from a simple circuit with a 20 resistor and is represented in the table

A skydiver of mass m jumps from a hot air balloon and falls a distance d before reaching a terminal velocity of magnitude v. Assume that the magnitude of the acceleration due to gravity is g. a.

8. What happens to force when mass is increased?

Give an example of ionic and covalent bond, and explain and make an example for each.