CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Value Based Questions 2 Mark Questions With Solution 2021
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CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Value Based Questions 2 Mark Questions With Solution 2021
11th Standard CBSE
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Reg.No. :
Physics
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Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone. Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
List some qualities of Sanjay.(a) -
Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone . Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
A grinding stone of diameter 4 m revolving at 120 rpm accelerates to 660 rpm in 9s. Calculate the angular acceleration and linear acceleration.(a) -
Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone . Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
When his mother uses grindstone to get flour, what energy transformation takes place?(a) -
Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone . Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
After attaching motor to grindstone wheel, what energy transformation takes place?(a)
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CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Value Based Questions 2 Mark Questions With Solution 2021 Answer Keys
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caring, thoughtful, intelligent, creative are some qualities we can observe about Sanjay from this paragraph.
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Given, \(radius,r=\frac { diameter }{ 2 } =\frac { 4 }{ 2 } =2m\)
\({ n }_{ 1 }=120rpm=\frac { 120 }{ 60 } rps=2rps\)
\(\\ { n }_{ 1 }=660rpm=\frac { 660 }{ 60 } rps=11rps\)
\(\therefore \ Angular\ acceleration,\alpha =\frac { { \omega }_{ 2 }-{ \omega }_{ 1 } }{ t } =\frac { 2\pi \left( { n }_{ 2 }-{ n }_{ 1 } \right) }{ t } \)
\(=\frac { 2\pi \left( 11-2 \right) }{ 9 } =2\pi rad/{ s }^{ 2 }\)
Linear acceleration, \(\alpha =r\alpha =2\times 2\pi =4\pi m/s^{ 2 }\). -
Muscular energy to mechanical energy.
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Electrical energy to mechanical energy.
