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Class 9 Physics Dynamics


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EXAMPLE3.8Astoneofmass100 gisattachedtoastring1 mlong.Thestoneisrotatinginacirclewithaspeedof5 ms1.Findthetensioninthestring.EXAMPLE 3.8 A stone of mass 100 \mathrm{~g} is attached to a string 1 \mathrm{~m} long. The stone is rotating in a circle with a speed of 5 \mathrm{~ms}^{-1} . Find the tension in the string.

A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?
A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?

Athermosflaskcontainingmilkasasystemisshakenrapidly.Doesthetemperatureofmilkrise?A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?

Show that ratio of the root mean square speeds of molecules of two different gases at a certain temperature is equal to the square root of the inverse ratio of their masses.
Show that ratio of the root mean square speeds of molecules of two different gases at a certain temperature is equal to the square root of the inverse ratio of their masses.

Showthatratiooftherootmeansquarespeedsofmoleculesoftwodifferentgasesatacertaintemperatureisequaltothesquarerootoftheinverseratiooftheirmasses.Show that ratio of the root mean square speeds of molecules of two different gases at a certain temperature is equal to the square root of the inverse ratio of their masses.

3.5 A body has weight 20 \mathrm{~N} . How much force is required to move it vertically upward with an acceleration of 2 \mathrm{~ms}^{-2} ? (24 N)
 3.5  A body has weight  20 \mathrm{~N} . How much force is required to move it vertically upward with an acceleration of  2 \mathrm{~ms}^{-2} ? (24 N)

3.5Abodyhasweight20 N.Howmuchforceisrequiredtomoveitverticallyupwardwithanaccelerationof2 ms2?(24N) 3.5 A body has weight 20 \mathrm{~N} . How much force is required to move it vertically upward with an acceleration of 2 \mathrm{~ms}^{-2} ? (24 N)

ii. Inertia depends upon(a) force(b) net force(c) mass(d) velocity
ii. Inertia depends upon(a) force(b) net force(c) mass(d) velocity

ii.Inertiadependsupon(a)force(b)netforce(c)mass(d)velocityii. Inertia depends upon(a) force(b) net force(c) mass(d) velocity

A heat engine performs 100 \mathrm{~J} of work and at the same time rejects 400 \mathrm{~J} of heat energy to the cold reservoirs. What is the efficiency of the engine?
A heat engine performs  100 \mathrm{~J}  of work and at the same time rejects  400 \mathrm{~J}  of heat energy to the cold reservoirs. What is the efficiency of the engine?

Aheatengineperforms100 Jofworkandatthesametimerejects400 Jofheatenergytothecoldreservoirs.Whatistheefficiencyoftheengine?A heat engine performs 100 \mathrm{~J} of work and at the same time rejects 400 \mathrm{~J} of heat energy to the cold reservoirs. What is the efficiency of the engine?

3.2 The weight of a body is 147 \mathrm{~N} . What is its mass? (Take the value of g as 10 \mathrm{~ms}^{-2} )(14.7kg)
 3.2  The weight of a body is  147 \mathrm{~N} . What is its mass? (Take the value of  g  as  10 \mathrm{~ms}^{-2}  )(14.7kg)

3.2Theweightofabodyis147 N.Whatisitsmass?(Takethevalueofgas10 ms2)(14.7kg) 3.2 The weight of a body is 147 \mathrm{~N} . What is its mass? (Take the value of g as 10 \mathrm{~ms}^{-2} )(14.7kg)

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