Question

Q10. (a) Distinguish between speed and velocity
(b) Distinguish between distance and displacement
(c) Differentiate between homogenous and heterogeneous mixture
(d) Why do liquids have mostly lower density than solids​

Answer 1

Answer:

Liquids as we know, have a lesser density than solids because the intermolecular space (space between molecules) is more and intermolecular force of attraction is less (because of being loosely packed and far away from each other).

Answer 2

Answer:

(a) speed is a scalar quantity. Time rate of distance is called speed.speed= distance / time. unit m/s dimensional formula LT^-1

velocity is a vector quantity.time rateof displacement is called velocity.velocity =displacement / time interval.unit m/s. dimensional formula LT^-1

(b)displacement is the straight line distance between initial and final point it is a vector quantity itcan be +ve, -ve, or0

(d) because liquid molecules have lesser space between molecule and the force of attraction is less due to the loosely packing that's why liquids have lower density than solids