The gravitational force acting on an object is its
a. mass
b. inertia
c. weight
d. resistance

Mass

Explanation:

The gravitational force acting on an object is dependent on its mass (m).

Gravitational force is directly proportional to the mass of the objects and inversely proportional to the square of distance apart.

F = GM/r²

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o