Question

3. A body will float on water, if the weight of the body.
(a) exceeds the force exerted by water.
(b) is lesser than the force exerted by water.
(c) is equal to the force exerted by water.
(d) none of these.

4.The state of motion of a body is described by
(a) its speed only.
(b) its direction of motion only.
(c) its speed and direction of motion.
(d) none of these.​

Answer 1

Answer:

3.

(b) is lesser than the force exerted by water

4.

(c) it's speed and direction of motion

Explanation:

3. Buoyency

if weight of body is lesser than the force exerted by fluid body floats.....

4.

Magnitude as well as direction....

Hope it helps

Answer 2

Concept introduction:

The balance of a body floating in still water depends on Archimedes' Principle, which asserts that a body submerged in a fluid suffers an up thrust proportional to the weight of the fluid expelled. Gravity exerts a downward pull on a body that is free-floating in calm water.

Explanation:

Given that, body floats on water.

We have to find, when body floats on water and state of motion.

According to the question,

$3.$ (b) is lesser than the force exerted by water. As the downward and upward force cancels each other the body floats.

$4.$(c) its speed and direction of motion. Velocity is vector quantity which have both magnitude and direction.

Final Answer:

$3.$ (b) is lesser than the force exerted by water.

$4.$(c) its speed and direction of motion.

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