How does the law of conservation of mass apply to this reaction: c2h4+o2--> 2h2o+2co2? the equation needs to be balanced. there are fewer oxygen atoms in the equation than hydrogen or carbon. only the oxygen needs to be balanced. there are equal numbers of hydrogen and carbon. the law of conservation of mass has already been applied. there is an equal number of each element on both sides of the equation. each element needs to be balanced

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=

If a star is moving toward earth, it is

Aspaceship starting from a resting position accelerates at a constant rate of 9.8 meters per second per second. how far will the spaceship travel if its final speed is 1 percent the speed of light (300,000,000 m/s)? a. 3.1 × 106 m b. 2.94 × 108 m c. 7.8 × 1010 m d. 4.6 × 1013 m