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A wind with speed $40 m s^{- 1}$ blows parallel to the roof of a house. The area of the roof is $250 m^{2} .$ Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be $(ρ_{air} = 1.2 kg m^{- 3})$

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Important Questions on Friction in Solids and Liquids

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 4 - Friction in Solids and Liquids>Competitive Thinking>Q 72

Water is filled in a cylindrical container to a height of $3 m$ . The ratio of the cross-sectional area of the orifice and the beaker is $0.1$ . The square of the speed of the liquid coming out from the orifice is $(g = 10 m s^{- 2})$

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 4 - Friction in Solids and Liquids>Competitive Thinking>Q 73

A cylindrical tank having cross-sectional area A is filled with water to a height of

2.0 m

. A circular hole of cross-section area

a

is opened at a height of

75 cm

from the bottom. If

\frac{a}{A} = \sqrt{0.2},

then velocity with which water emerges from the hole is

(g = 9.8 m s^{- 2})

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 4 - Friction in Solids and Liquids>Competitive Thinking>Q 74

A cylindrical vessel of

90 cm

height is kept filled upto the brim. It has four holes

1, 2, 3, 4

which are respectively at heights of

20 cm

30 cm, 45 cm

and

50 cm

from the horizontal floor

P Q

. The water falling at the maximum horizontal distance from the vessel comes from

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 4 - Friction in Solids and Liquids>Competitive Thinking>Q 75

A cylinder of height

h

is filled with water and is kept on a block of height

\frac{h}{2} .

The level of water in the cylinder is kept constant. Four holes numbered

1, 2, 3

and

4

are at the side of the cylinder and at heights

0, \frac{h}{4}, \frac{h}{2}

and

\frac{3 h}{4}

respectively. When all four holes are opened together, the hole from which water will reach farthest distance on the plane

PQ

is the hole no.

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 4 - Friction in Solids and Liquids>Competitive Thinking>Q 76

A roller is made by joining together two cones at their vertices

O

. It is kept on two rails

A B

and

C D

which are placed asymmetrically (see figure), with its axis perpendicular to

C D

and its centre

O

at the centre of line joining

A B

and

C D

(see figure). It is given a light push so that it starts rolling with its centre

O

moving parallel to

C D

in the direction shown. As it moves, the roller will tend to

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 4 - Friction in Solids and Liquids>Competitive Thinking>Q 77

The coefficient of static and dynamic friction between a body and the surface are

0.75

and

0.5

respectively. A force is applied to the body to make it just slide with a constant acceleration which is

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 4 - Friction in Solids and Liquids>Competitive Thinking>Q 78

A body of mass

M

is resting on a rough horizontal plane surface, the coefficient of friction being equal to

μ .

t = 0,

a horizontal force

F = F_{0} t

starts acting on it, where

F_{0}

is a constant. The time

T

at which the motion starts is

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 4 - Friction in Solids and Liquids>Competitive Thinking>Q 79

A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches

30 °

, the box starts to slip and slides

4.0 m

down the plank in

4.0 s

. The coefficients of static and kinetic friction between the box and the plank will be, respectively

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A wind with speed 40 m s-1 blows parallel to the roof of a house. The area of the roof is 250 m2. Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be ρair=1.2kg m-3

Important Questions on Friction in Solids and Liquids

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A wind with speed $40 m s^{- 1}$ blows parallel to the roof of a house. The area of the roof is $250 m^{2} .$ Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be $(ρ_{air} = 1.2 kg m^{- 3})$