Question 333: Properties of Matter

Question

The terminal velocity of a copper ball of radius 5 mm falling through a tank of oil at room temperature is 10 cm s
$$-$$1
. If the viscosity of oil at room temperature is 0.9 kg m
$$-$$1
s
$$-$$1
, the viscous drag force is :

Accepted Answer

F
viscous
= $$-$$6$$\pi$$$$\eta$$av
F
viscous
= 6 $$	imes$$ 3.14 $$	imes$$ 0.9 $$	imes$$ 5 $$	imes$$ 10
$$-$$3
$$	imes$$ 10 $$	imes$$ 10
$$-$$2
= 84.78 $$	imes$$ 10
$$-$$4
= 8.478 $$	imes$$ 10
$$-$$3
N

Answer

4.23 $$	imes$$ 10
$$-$$6
N

Answer

8.48 $$	imes$$ 10
$$-$$3
N

Answer

8.48 $$	imes$$ 10
$$-$$5
N

Answer

4.23 $$	imes$$ 10
$$-$$3
N

Properties of Matter

The terminal velocity of a copper ball of radius 5 mm falling through a tank of oil at room temperature is 10 cm s $-1 . If the viscosity of oil at room temperature is 0.9 kg m -1 s -$1 , the viscous drag force is :

Choose the correct answer: