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Class 11th

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Class 11th Physics

The ratio of tensions $T_{A} : T_{B}$ in two strings $A$ and $B$ supporting a log of mass $M$ as shown in figure is

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alok kumar singh

Contributor-Level 10

Balancing torque about COM

$T_{A} (\frac{l}{2}) = T_{B} (\frac{l}{6})$

$? \frac{T_{A}}{T_{B}} = \frac{1}{3}$

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Class 11th Physics

In case of horse pulling a cart , the force that causes the horse to move forward is the force that

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Vishal Baghel

Contributor-Level 10

As per Newton third law, the horse exerts a force on the ground, the ground will also exert a force on the horse.

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3 months ago

Class 11th Physics Oscillations

If length of stretched string is increased by 50% keeping mass per unit length same, then in order to keep its frequency of vibration constant, its tension must be increases by

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Vishal Baghel

Contributor-Level 10

$f \propto \frac{\sqrt[]{T}}{l}$

$\Rightarrow T \propto l^{2}$

$\Rightarrow T \propto l^{2}$ for same frequency

l' = 1.5 l

$\Rightarrow T' = 2.25 T$ 0020

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3 months ago

Class 11th Physics

A car is skidding on an icy road with speed $v$ and tyres are rotating with angular speed $\frac{v}{3 R}$ , where $R$ is the radius of tyres. The distance travelled by car in one rotation of tyres is

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alok kumar singh

Contributor-Level 10

$θ = ω t$

$2 π = (\frac{V}{3 R}) T$

$? t = \frac{6 π R}{V}$

The distance travelled by car in this time is

$s = v t$

$? s = v (\frac{6 π R}{V})$

$= 6 π R$

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Class 11th Physics

Two balls each of mass 1kg moving in opposite directions with speed 15m/s collides and rebounds with the same speed. The magnitude of impulse imparted to each ball due to other is

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Vishal Baghel

Contributor-Level 10

l = m (2v) = 1 * 2 * 15 = 30 kg m s^-¹

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3 months ago

Class 11th Physics Motion in Plane

The velocity of boat m still water is 10 ms $m s^{- 1}$ . The river flow velocity is 5 ms $m s^{- 1} .$

If $_{}$ $v_{b}$ ,= velocity of boat with respect to river velocity, $v_{b} =$ $_{}$ actual velocity of boat (i.e. with respect to bank), $v_{r} =$ $_{}$ velocity of stream, then the value of $v_{b}$ $_{}$ is

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Raj Pandey

Contributor-Level 9

$v_{b} = v_{b r} + v,$

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Class 11th Physics Thermodynamics

The correct graph between logeR and loge( - 0) during cooling of a body may be (R is the rate of cooling and 0 is surrounding temperature)

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Vishal Baghel

Contributor-Level 10

$R \propto (θ - θ_{0})$

$\Rightarrow l o g_{e} R = l o g_{e} k + l o g_{e} (θ - θ_{0})$

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Class 11th Physics

The radius of circle, the period of revolution $T$ , initial position and sense of revolution are indicated in the figure. x-projection of the radius vector of rotating particle $P$ is