**1) Neeta Puts Two Balls, A, and B, of Weight 15 Each in the Different Swimming Pools. The Upthrust on Ball A Was 12 gf, and the Upthrust on Ball B Was 18 gf. Which Ball Will Float, and Which Will Sink? Explain.**

The weight of the ball A = 15 gf

Upthrust on the ball A = 12 gf

Here, 12 < 15

Since the upthrust on ball A is less than the weight of ball A (U < W).

Therefore, ball A will sink.

The weight of the ball B = 15 gf

Upthrust on the ball B = 18 gf

Here, 18 > 15

Since the upthrust on the ball B is more than the weight of the ball B (U > W). Therefore, ball B will float.

**2) The object’s weight in the Water and the Air Is 18 Kgf and 8 Kgf, respectively. Find the Upthrust That Will Act on the Object When Placed in Water.**

We know that W_{L} = W_{A} – U. From this formula, it follows that

U = W_{A} – W_{L}

Substitute 18 for W_{A} and 8 for W_{L} in the formula U = W_{A} – W_{L}

and then subtract to get the upthrust.

U = 18 – 8

= 10 Kgf

Thus, the upthrust due to the water is 10 Kgf.

**3) A Wooden Block Weight 12 GF Was Placed in Water. An Upward Force Acting on the Wooden Block Due to the Water Is 4 GF. Find the Weight of the Wooden Block in the Water.**

Weight of the wooden block in the air = 12 gf

Upthrust due to water = 4 gf.

The formula to calculate the body’s weight in liquid is

W_{L} = W_{A} – U, where

W_{L} = Body’s weight in liquid

W_{A} = Body’s weight in the air

U = Upthrust due to liquid.

Substitute 12 for W_{A} and 4 for U in the formula W_{L} = W_{A} – U and then simplify to get the weight of the wooden block in the water.

W_{L} = 12 – 4

= 8

Therefore, the weight of the wooden block in the water is 8 gf.

Admissions open for 2024-2025

| K12 Techno Services ®

ORCHIDS - The International School | Terms | Privacy Policy | Cancellation