Tags Physics

Physics

Get insights from 5.6k questions on Physics, answered by students, alumni, and experts. You may also ask and answer any question you like about Physics

Follow Ask Question

5.6k

Questions

Discussions

Active Users

Followers

New answer posted

a year ago

Physics NEET

What is weightage of Class 11 Physics Chapter 11 Thermodynamics in NEET and JEE Main exams?

0 Follower 8 Views

Pallavi Pathak

Contributor-Level 10

In NEET entrance test, the weightage of Class 11 Physics Chapter 11 Thermodynamics is around 7%. Students should thoroughly understand the thermodynamic laws and internal energy. The medical entrance test includes theory and numerically-based questions. For JEE Main, the chapter has more significance, and it has nearly 15% weightage of the total Physics syllabus.

0 0

New answer posted

a year ago

Physics Thermodynamics

n mole of perfect gas undergoes a cyclic process ABCA (see figure) consisting of the following processes.

A->B : Isothermal expansion at temperature T so that the volume is doubled from V₁ to V₂ and Pressure changes from P₁ to P₂.

B->C : Isobaric compression at pressure P₂ to initial volume V₁.

C->A : Isobaric change leading to change of pressure from P₂ to P₁.

Total work done in the complete cycle ABCA is:

0 Follower 8 Views

alok kumar singh

Contributor-Level 10

$W_{A B} = n R T l n \frac{2 V_{1}}{V_{1}} = n R T l n 2 .$

$W_{B C} = P_{2} (V_{1} - 2 V_{1}) = - P_{2} V_{1} = - \frac{1}{2} n R T$

[At B, 2P₂ V₁ = nRT]

$W_{C A} = 0$ [CA is isochoric process].

$W_{A B C A} = W_{A B} + W_{B C} + W_{C A} = n R T (l n (2) - \frac{1}{2})$

0 0

New answer posted

a year ago

Physics Electromagnetic Induction

The current in a coil of self inductance 2.0 H is increasing according to I = 2sin(t2)A. The amount of energy spent during the period when current changes from 0 to 2 A is…………J.

0 Follower 4 Views

Raj Pandey

Contributor-Level 9

Given, L = 2H

l = 2 sin (t²)

$u = \int_{0}^{2} L i d i = \frac{L}{2} {[i^{2}]}_{0}^{2} = \frac{L}{2} [4 - 0]$

$u = \frac{2}{2} * 4 = 4 J$

0 0

New answer posted

a year ago

Physics Class 11th

What are conservative and non conservative forces?

0 Follower 4 Views

Aadit Singh Uppal

Contributor-Level 10

Power calculations can also differ based on the nature of forces, which are as follows:

Conservative Forces: Here, work done is path-independent. e.g., gravity, spring force
Non-Conservative Forces: Work depends on the path. e.g., friction

0 0

New answer posted

a year ago

Physics Class 12th

The total current supplied to the circuit is shown in figure by the 5 V battery is…………….A.

0 Follower 74 Views

Raj Pandey

Contributor-Level 9

$\equiv R e q = 2.5 Ω$

$l = \frac{v}{R_{e q}} = \frac{5}{2.5} = 2 A$

0 0

New answer posted

a year ago

Physics Class 11th

Moment of inertia (M.I) of four bodies, having same mass and radius, and reported as:

I₁ = M.I. of thin circular ring about its diameter

I₂ = M.I. of circular disc about an axis perpendicular to disc and going through the centre,

I₃ = M.I. of solid cylinder about its axis and

I₄ = M.I. of solid sphere about its diameter.

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

$l_{1} = \frac{1}{2} m r^{2}$

$\begin{array}{l} l_{2} = \frac{1}{2} m r^{2} \\ l_{3} = \frac{1}{2} m r^{2} \\ l_{4} = \frac{2}{5} m r^{2} \end{array}$

0 0

New question posted

a year ago

Physics NEET

What is weightage of Class 11 Physics Chapter 11 Thermodynamics in NEET and JEE Main exams?

0 Follower 3 Views

New answer posted

a year ago

Physics Class 12th

A resistor develops 300 J of thermal energy in 15s, when a current of 2 A is passed through it. If the current increases to 3 A, the energy developed in 10s is…………….J.

0 Follower 2 Views