How does the law of conservation of mass apply to this reaction c2h4 + o2 > 2h2o + 2co2 ?
a. only the oxygen needs to be balanced
b. the equation needs to be balanced. there are fewer oxygen atoms in the equation than hydrogen and carbon
c. the law of conservation of mass has already been applied
d. each element needs to be balanced

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.

Most short-period comets do not have randomly oriented orbits because

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward