Question 311: 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 :

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