Question

solve the following ​

Answer 1

Answer:

1) downward arrow denotes the force of acceleration due to gravity by earth

2) atmospheric pressure, frictional force of the air, buoyant force of the air ( it may be right but I think buoyant force)

3)Density of an object is determined by the mass in a particular volume or some space . the density of a mercury is 13.6gcm-3. From this we can understand that 13.6 gm of mercury can be fits in per cubic centimetres.

4)If ship moves from sea water to river water it would sinks because of the buoyant force of the water. buoyant force is a upward force of less density by the high density water. Density of a sea is more than that of river water. Hence ship will sinks in rivers but in sea water it would floats