In order for a combustion reaction to occur, like the burning of fossil fuels, what element is required?

Sulfur

Hydrogen

Oxygen

Helium

Why did sodium become positively charged?

Three small masses are positioned at the following coordinates: 3.0 kg at (3.0 m, 2.0 m); 4.0 kg at (0.0 m, - 1.0 m); and 5.0 kg at (5.0 m, - 7.0 m). What are the coordinates of the center of mass (or center of gravity) of this system?

Determine the x intervept of the line from equation 8x - 5y = - 11

Boiling water transfers energy to an ice cube this is an example of

How are skyscrapers designed to battle wind?

Animals that can hear ultrasonic sounds are the what

If the rock has a mass of 1 kg which is the speed of the rock after it has fallen for two seconds

2 Cars A and B both at rest are to set of from a town to a common destination along the same route. Car A was the first to take off and travelled at 2.

In an experiment to measure the acceleration due to gravity, g two values, 9.72 m/s2 and 9.67 m/s2, as determined. if the accepted value of g is: 9.8 m/s2 find the followings: i) the percentage difference of the measurements?

If momentum is conserved in a collision, does this indicate conclusively that the collision is elastic?