CBSE > Class 11 > Physics | CBSE Board | Homework Help

Unlike solid and liquid state, molecules in gaseous state show random motion. That is the reason, gases take the shape of container and spread quickly in space. The random motion of molecules in the gaseous state is due to high kinetic energy in molecules. They have weak intermolecular interactions between them.

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What will be the dimensional formula of 'g acceleration due to gravity'

Posted by Varun Agarwal 4 years ago

CBSE > Class 11 > Physics

3 answers

Mashira Rubab 4 years ago

[MLT-2]

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Varun Agarwal 4 years ago

Okay thank you

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Priyanshu Dubey 4 years ago

It is an acceleration therefore it's dimensional formula will be equal to dimensional formula of acceleration

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What is FPS system of measurement

Posted by Mahmadul Hasan 4 years ago

CBSE > Class 11 > Physics

4 answers

Tejaswini Rajput 4 years ago

Foot , pound, time

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Arisha Fatma 4 years ago

In thus system,unit if length is foot,the unit of mass is pound and the unit of time is second

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Mannu Dahiya 4 years ago

Foot(length) Pound(mass) Second(time). This critria was followed by Britishers by which earlier we also used it after the independence of Indians from them as we were also habitual of their culture.

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Anjan Karthi 4 years ago

FPS system is the System of units and measurements which are of British origin. The three major units in this system are FEET for length (ft), POUNDS for mass (pd) and SECOND for time (sec).

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Find the acceleration due to gravity in a mine of depth 640 m if the value at the surface is 9.800 m/s².The radius of Earth is 6400 km.

Posted by Rajendra Singh Rawat 4 years ago

CBSE > Class 11 > Physics

2 answers

Anjan Karthi 4 years ago

g at the depth = g at surface (1-d/r) = 9.8 (1- 640/6400000 ) = 9.8 (1 - 1/10000) = 9.8 (9999/10000) = 9.799 m/s^2.//

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Devil Dada 4 years ago

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Determine the force required to double the length of steel wire of cross section 5×10^-5m^2. Young modulus of steel 2×10^11 nm^2

Posted by Chessghuman Chessghuman 4 years ago

CBSE > Class 11 > Physics

1 answers

Harmanpreet Kaur 4 years ago

Y=FL/A∆L Given,A=5×10^-5m2,Y=2×10^11 nm^-2,L=X ,∆L=2L-L=L Putting the values in formulà F=YA∆L/L F=10^7N

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If unit of length and time is doubled the numerical value of"g" ( acceleration due to gravity) will be :

Posted by Palak Latha 4 years ago

CBSE > Class 11 > Physics

2 answers

Anjan Karthi 4 years ago

L' = 2L. T' = 2 T. (where, L' and T' are the new units of length and time). Therefore, Numerical value of new g ie, g' = a = L'/T' = 2L/2T = L/T. // Therefore, g' = g.

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ᥬ JaຮWaηth᭄ 4 years ago

Sorry I don't know

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A raindrop of mass 2.00 g falls from a height of 1.00 km. It hits the ground with a speed of 50.0 m/s. What is the work done by the resistive forces if any? (Take g = 10 ms 2)

Posted by Sanjusha Pv 4 years ago

CBSE > Class 11 > Physics

1 answers

Vasudha Vasudha 4 years ago

Assuming u=0 and constant g=10ms−2 the work done by the grativational force is Wg=mgh =2×10−3×10×103=20J (b) ΔK=12mV2−0 =12×2×10−3×40×40 =1.6J From the work-energy theorem Δk=Wg+Wr where Wr is the work done by the opposing resistive force. 1.6=20+Wr Wr=−18.4J

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Subscribe me on YouTube https://youtube.com/channel/UCpoY_1xpubmLoxLsZOndskg Plz frnds

Posted by Dishant Dahiya 4 years ago

CBSE > Class 11 > Physics

2 answers

Mannu Dahiya 4 years ago

Unsubscribe kr dia becoz of u not liked my comment

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Mannu Dahiya 4 years ago

Ho gya Like my comment

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The scalar product of two vector A and B is

Posted by Vishakha Yadav 4 years ago

CBSE > Class 11 > Physics

1 answers

Vasudha Vasudha 4 years ago

The scalar product of a and b is: a · b = |a||b| cosθ We can remember this formula as: “The modulus of the first vector, multiplied by the modulus of the second vector, multiplied by the cosine of the angle between them

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Is acceleration due to gravity always negative?

Posted by Pooja Tarai 4 years ago

CBSE > Class 11 > Physics

4 answers

Naman Patel 4 years ago

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Anjan Karthi 4 years ago

No, it depends upon how we apply Sign conventions in the situation. If we take downwards as -ve and upwards as +ve, then g becomes -ve and when we take downwards as +ve and upwards as -ve, then g would be positive.

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Sneha Sneha 4 years ago

Yes it would be because acceleration due Gravity is always downwards in -ve y axis

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Vasudha Vasudha 4 years ago

Towards the center of the Earth, the gravity is defined to the be negative. At all points on the trajectory of a projectile, the gravitational acceleration points in the same direction, which is downwards toward the center of the Earth. So, the sign for the gravitational acceleration is always negative.

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Mcq questions

Posted by Kiran Kumari 4 years ago

CBSE > Class 11 > Physics

1 answers

Shivani Choudhary 4 years ago

Give the common name of periplanata American

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Which is odd one ? (a) displacement (b) potential energy (c)torqe (d) momentum

Posted by Nidhi Sharma 4 years, 1 month ago

CBSE > Class 11 > Physics

5 answers

Srishti Soumya 4 years ago

Potential energy

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Abhinav Maurya 4 years, 1 month ago

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Nidhi Sharma 4 years, 1 month ago

Please tell the exact one!!

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Jyoti Sharma 4 years, 1 month ago

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Mansi Gupta 4 years, 1 month ago

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When electron flows through a wire and a circular loop is held above, what is the direction of the induced current in the circular loop?

Posted by Ganesan Sankar 4 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Jyoti Sharma 4 years, 1 month ago

The current will change direction as the electron passes through the circular loop

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Two vectors, both equal in magnitude, have their resultant equal in magnitude of the either. Find the angle between the two vectors.

Posted by Cilestina Lepcha 4 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Vasudha Vasudha 4 years ago

|A+B−→−−−|=|A→|2+|B→|2+2|A→||B→|cosθ−−−−−−−−−−−−−−−−−−−−−−−√ Complete answer: Let the two vectors be |A→| and |B→|. θ be the angle between both the vectors. Both the vectors have the same magnitude. ∴|A→|=|A→| …(1) Let the resultant have magnitude equal to vector A. Thus, the resultant is given by, |A→|=|B→|=|A+B−→−−−| …(2) The magnitude of resultant of two vectors is given by, |A+B−→−−−|=|A→|2+|B→|2+2|A→||B→|cosθ−−−−−−−−−−−−−−−−−−−−−−−√ …(3) From the equation. (2) and equation. (3) we get, |A→|=|A→|2+|B→|2+2|A→||B→|cosθ−−−−−−−−−−−−−−−−−−−−−−−√ Squaring both the sides we get, ⇒|A→|2=|A→|2+|B→|2+2|A→||B→|cosθ Substituting equation. (1) in above equation we get, |A→|2=|A→|2+|A→|2+2|A→||A→|cosθ ⇒|A→|2=2|A→|2+2|A→||A→|cosθ ⇒−|A→|2=2|A→||A→|cosθ ⇒cosθ=−12 ⇒θ=cos−1(12) ⇒θ=120° Hence, the angle between the two vectors is 120°.

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A tank 10 m high is half filled with water and then filled with oil of density 750kg m3.what is the pressure at the bottom of tank due to this liquid?

Posted by Muskan Johal 4 years, 1 month ago

CBSE > Class 11 > Physics

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A gun fire of bullet of mass 40gram with speed of 1200m/s .which required a force of 144 newton. Calculate the number of bullet fire in 1 second

Posted by Ansh Saurav Kashyap 4 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Anjan Karthi 4 years ago

F = n × ma = n × mv/t. Therefore, n = F/mv = 144 × 1000 / 1200 × 40 = 3//

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A stone weighs 100N on the surface of Earth. Find the ratio of its weight at a height of half the radius of Earth to the depth of half the radius of Earth.

Posted by Bholu Rahar 4 years, 1 month ago

CBSE > Class 11 > Physics

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Find the angular velocity of second hand, minutes hand,hour hand of a clock.Also find the linear velocity of each needle if the length of the needle 15cm,10cm,5cm respectively

Posted by Mahak Maddhhesiya 4 years, 1 month ago

CBSE > Class 11 > Physics

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check the correctness of relation v=sqrt2GM/R

Posted by Dimpal Kumari Mali B 4 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Anjan Karthi 4 years ago

LHS →v = [LT^-1]. RHS → √GM/R = { [M^-1L^3T^-2] [M] / [L] }^1/2 = { [L^2T^-2] }^1/2 = [LT^-1]. Therefore, LHS = RHS.

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Scope of excitement of physics

Posted by Arman Verma 4 years, 1 month ago

CBSE > Class 11 > Physics

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A Satellite is at a height of400m Find Vo and total energy

Posted by Soniya Rana 4 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Anjan Karthi 4 years, 1 month ago

Vo = √GM/R+h = √6.67 × 10^-11 × 6 × 10^24 / 6.4 × 10^6 + 400 = 40.02 × 10^13 / 6400 × 10^3 + 400 = 40.02 × 10^13 / 400 (16001) = 40.02 × 10^13 / 6400400 = 40.02 × 10^13 / 6.4004 × 10^6 = 6.25 × 10^7 m/s. //

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. A Satellite is at a height of foorem. Find Vo and total energy

Posted by Soniya Rana 4 years, 1 month ago

CBSE > Class 11 > Physics