A wind with a speed $40 m \cdot s^{- 1}$ blows parallel to the roof of a house. 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 direction of the force will be _________ $(ρ_{air} = 1.2 kg \cdot m^{- 3})$

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Important Questions on Mechanical Properties of Matter

EASY

AP EAPCET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Mechanical Properties of Matter>AP EAPCET Medical 2021 (6-Sep Afternoon)>Q 15

A flat plate of area $10 {cm}^{2}$ is separated form a large plate by a layer of Glycerine $1 mm$ thick. If the coefficient of viscosity of Glycerine is $20$ poise, the force required to keep the plate moving with a velocity of $1 cm s^{- 1}$ is

EASY

AP EAPCET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Mechanical Properties of Matter>AP EAPCET Medical 2021 (6-Sep Forenoon)>Q 16

Two rain drops falling through air have radii in the ratio

1 : 2

. They will have terminal velocity in the ratio________

EASY

AP EAPCET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Mechanical Properties of Matter>AP EAPCET - 3 Sep 2021 Forenoon>Q 17

An air bubble of radius

1.0 cm

rises with a constant speed of

3.5 mm s^{- 1}

through a liquid of density

1.75 \times 10^{3} kg m^{- 3} .

Neglecting the density of air. the coefficient of viscosity of the liquid is _________

{kgm}^{- 1} s^{- 1}

EASY

AP EAPCET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Mechanical Properties of Matter>AP EAPCET - 3 Sep 2021 Forenoon>Q 18

Identify the incorrect statement about 'angle of contact':
(a) Angle of contact depends upon the inclination of the solid surface to the liquid surface.
(b) If the angle of contact of a liquid and a solid surface is less than

90 °,

then the liquid spreads on the surface of the solid.
(c) Angle of contact increases with increase in temperature of liquid.
(d) The value of angle of contact for pure water and glass is zero.