Physics Tutors in Azad Nagar, Delhi

For 8th question,

Electrostatic potential is defined as the amount of work done in bringing a unit charge from infinity to a certain point. V=W/qo It is a scalar quantity. SI unit J/C or volt.

The vernier calipers found in the laboratory incorporates a main scale and a sliding vernier scale which allows readings to the nearest 0.02 mm. This instrument may be used to measure outer dimensions of objects (using the main jaws), inside dimensions (using the smaller jaws at the top), and depths (using the stem).

F=ma

Since F is constant, a is also constant.Therefore from Kinematics:

S=ut+21​at2

10=0+21​a×4 (Since object is at rest initially)

a=210​=5m/s2

F=2×5=10N

Pass the light through Analyser.

If PPL is passed and analyser is rotated, the intenssity becomes zero at 90 deg. and maximum at 0 deg

If Partially PPL is passed then intensity falls as we rotate and doesn't becomes zero at any angle..

From this we can find whether given light is PPL or not.

Quite a few non-metals react with hydrogen forming covalent bonded compounds. Some well-known examples are : Nitrogen and Hydrogen react to form Ammonia (NH3), Carbon and Hydrogen react to form Methane (CH4), Chlorine and Hydrogen react to form Hydrogen chloride (HCl),Sulphur reacts with Hydrogen to form Hydrogen sulphide (H2S), Phosphorus reacts with Hydrogen to form Phosphine (PH3), and Oxygen forms Water (H2O) reacting with Hydrogen. 

The flying of kite in air is an example of Random or Irregular motion.

संज्ञा- किसी जाति, द्रव्य, गुण, भाव, व्यक्ति, स्थान और क्रिया आदि के नाम को संज्ञा कहते हैं। जैसे - पशु (जाति), सुंदरता (गुण), व्यथा (भाव), मोहन (व्यक्ति), दिल्ली (स्थान), मारना (क्रिया)। यह पाँच प्रकार की होती है -- 1. व्यक्तिवाचक संज्ञा 2. जातिवाचक संज्ञा 3. समूहवाचक संज्ञा 4. द्रव्यवाचक संज्ञा 5. भाववाचक संज्ञा

The Principle of moment is defined as the sum of clockwise moment is equal to the sum of anticlockwise moment.

Moment : Force X Perpendicular distance from turning point.

From this image you can understand that

Clockwise moment is 500N X 2m = 1000Nm

Anticlockwise moment is 1000N X 1m = 1000Nm

Levers works on principle of work done equilibrium obtained across a rod with respect to fulcrum. W1 = W2 It simply comes down to applied force(clockwise) × distance on one side will be equal to obtained force (anticlockwise) × distance on the other side (Distance with respect to the fulcrum of the rod). For example Force applied = F1 (cw) Distance of F1 from fulcrum = d1 Force obtained on other side = F2 (acw) distance from fulcrum @ force obtained = d2 Then force obtained F2(acw) = (F1 × d1) / d2