A bimetallic strip is made of aluminium and steel ). On heating, the strip will
remain straight
get twisted
will bend with aluminium on concave side
will bend with steel on concave side
Get Answer
If strips of aluminium and steel are fixed together on metallic strip and both are heated then aluminium will exapnd more because the metallic strip with higher coefficient of linear expansion will expand more Thus it should have larger radius of curvature. Hence, aluminium will be on convex side.
A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly
its speed of rotation increases
its speed of rotation decreases
its speed of rotation remains same
its speed increases because its moment of inertia increases
On heating a uniform metallic rod its length will increase so moment of inertia of rod increased from to . No external torque is acting on the system so angular momentum should be conserved.
Angular momentum constant
So,
Due to expansion of the
So, angular veloctiy decreases.
The graph between two temperature scales and is shown in figure between upper fixed point and
lower fixed point there are 150 equal division on scale and 100 on scale . The relationship for
conversion between the two scales is given by
An aluminium sphere is dipped into water. Which of the following is true?
Buoyancy will be less in water at than that in water at
Buoyancy will be more in water at than that in water at
Buoyancy in water at will be same as that in water at
Buoyancy may be more or less in water at depending on the radius of the sphere
As we know that, the Buoyant force on a body volume and density of , when immersed in liquid of density is
where volume of displaced liquid by dipped body . Let volume of the sphere is and is its density, then we can write buoyant force
Hence, buoyancy will be less in water at than that in water at .
As the temperature is increased, the period of a pendulum
increases as its effective length increases even though its centre of mass still remains at the centre of the bob
decreases as its effective length increases even though its centre of mass still remains at the centre of the bob
increases as its effective length increases due to shifting to centre of mass below the centre of the bob
decreases as its effective length remains same but the centre of mass shifts above the centre of the bob
As the temperature increased the length of the pendulum increases due to expansion is linear.
So, Time period of pendulum
Hence on increasing temperature, time period also increases.
Heat is associated with
kinetic energy of random motion of molecules
kinetic energy of orderly motion of molecules
total kinetic energy of random and orderly motion of molecules
kinetic energy of random motion in some cases and kinetic energy of orderly motion in other
As we know that when the temperature increases vibration of molecules about their mean position increases hence the kinetic energy associated with random motion of molecules increases.
The radius of a metal sphere at room temperature is and the coefficient of linear expansion of the metal is . The sphere heated a little by a temperature so that its new temperature is . The increase in the volume of the sphere is approximately.
Let the radius of the sphere is . As the temperature increases radius of the sphere increases as shown.
Original volume
Coefficient of linear expansion
Coefficient of volume expansion
As we know that
By putting the value of , increase in the volume
A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated to same high temperature.
Plate will cool fastest and cube the slowest
Sphere will cool fastest and cube the slowest
Plate will cool fastest and sphere the slowest
Cube will cool fastest and plate the slowest
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