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12 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Twelve

For a perfect gas, two pressures P1 and P2 are shown in figure. The graph shows:

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Payal Gupta

Contributor-Level 10

At constant Temp

$P α \frac{1}{v}$

v₂ > v₁

⇒ P₁ > P₂

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12 months ago

Class 12th Gravitation

Four spheres each of mass m form a square of side d (as shown in figure). A fifth sphere of mass M is situated at the centre of square. The total gravitational potential energy of the system is

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Payal Gupta

Contributor-Level 10

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12 months ago

Class 12th System of Particles and Rotational Motion

A stone tide to a string of length L is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position and has a speed u. The magnitude of change in its velocity, as it reaches a position where the string is horizontal, is $\sqrt[]{x (h^{2} - g L)} .$ The value of x is

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Payal Gupta

Contributor-Level 10

Conservation of Energy b/w (1) & (2)

$\frac{1}{2} m v^{2} + m g l = \frac{1}{2} m u^{2}$

$v = \sqrt[]{u^{2} - 2 g l}$

$\vec{Δ v} = v_{\hat{j}} - u_{\hat{i}}$

$| Δ \vec{v} | = \sqrt[]{{(u)}^{2} + {(\sqrt[]{u^{2} - 2 g l})}^{2}}$

$= \sqrt[]{u^{2} + u^{2} - 2 g l}$

$= \sqrt[]{2} (u^{2} - g l)$

x = 2

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12 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Five

One end of a massless spring of spring constant k and natural length $l_{0}$ is fixed while the other end is connected to a small object of mass m lying on a frictionless table. The spring remains horizontal on the table. If the object is made to rotate at an angular velocity $ω$ about an axis passing through fixed end, then the elongation of the spring will be

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Payal Gupta

Contributor-Level 10

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12 months ago

Class 12th Motion in a Straight Line

When a ball is dropped into a lake form a height 4.9 m above the water level, it hits the water with a velocity v and then sinks to the bottom with the constant velocity v. It reaches the bottom of the lake 4.0 s after it is dropped. The approximate depth of the lake is

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Payal Gupta

Contributor-Level 10

Total time (T) = 4 sec

Given u = 0 m/sec

a = g = 9.8 m/sec²

h = 4.9 m, t =?

$\Rightarrow h = u t + \frac{1}{2} a t^{2}$

$4.9 = 0 . t + \frac{1}{2} * 9.8 t^{2}$

t = 1 sec

'v' be the velocity with which ball hits the water v = u + at

= 0 + 9.8 * 1 = 9.8 m/sec

Time taken to reach the bottom of the lake from surface of the lake

= 4 – 1 = 3 sec

v = 9.8 m/sec

$H = u t + \frac{1}{2} g t^{2} = 9.8 * 3 + \frac{1}{2} * 9.8 * 9$

29.4 + 4.9 * 9 = 29.4 + 44.1

H = 73.5 m

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12 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Nine

The distance of the Sun from earth is 1.5 * 10¹¹ m and its angular diameter is (2000) s when observed from the earth. The diameter of the Sun will be

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Payal Gupta

Contributor-Level 10

1° → 60'

⇒ 60' → 10°

$60' \to {\frac{π}{180}}^{C}$

$θ = \frac{π * 2 * 1 0^{3}}{180 * 3600}$

L = 1.5 * 10¹¹ m

$D = L θ = 1.5 * 1 0^{11} * \frac{π}{180 * 3600} * 2 * 1 0^{3} = 1.45 * 1 0^{9} m$

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12 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Nine

The distance of the Sun from earth is 1.5 × 10¹¹ m and its angular diameter is (2000) s when observed from the earth. The diameter of the Sun will be

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New question posted

12 months ago

Class 12th Ray Optics and Optical Instruments

The distance of the Sun from earth is 1.5 × 10¹¹ m and its angular diameter is (2000) s when observed from the earth. The diameter of the Sun will be:

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12 months ago

Class 12th physics ncert exemplar solutions class 12th chapter two

The SI unit of a physical quantity is pascal-second. The dimensional formula of this quantity will be:

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Payal Gupta

Contributor-Level 10

S. I. unit Pascal – second $= \frac{N}{m^{2}} - s e c$

= $\frac{M L T^{- 2} T}{L^{2}}$

= $M L^{- 1} T^{- 1}$

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12 months ago

Class 12th Institute of Management Studies and Research

Does Uma Krishna Shetty Institute of Management Studies and Research accept Class 12th marks?

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Nitesh Gulati

Contributor-Level 10

Candidates seeking admission to the PGDM programme can enroll for admission with Class 12 and graduation marks. Candidates must complete graduation to enroll for certificate course. Uma Krishna Shetty Institute of Management Studies and Research admits students based on entrance exam scores. To get admission to UKS Institute of Management, candidates must meet the eligibility criteria set by the college. The application process at UKS Institute of Management is conducted online.

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