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6 months ago

Physics Class 11th

In which of the following numerical values, all zeroes are significant?

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alok kumar singh

Contributor-Level 10

In a number without decimal, trailing zeros are insignificant. If a number has a decimal, then preceding zeros are insignificant.

Hence, in 40.40 all zeros are significant

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6 months ago

Physics Physics Mechanical Properties of Fluids

A cube of mass ' $m$ ' and density ' $D$ ' is suspended from the point ' $P$ ' by a spring of stiffness $k$ as shown in figure. The system is kept inside a beaker filled with a liquid of density ' $d$ ', where $D > d$ . What is the elongation in the spring?

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alok kumar singh

Contributor-Level 10

$k x = m g - F_{u p}$

$k x = m g - \frac{m d}{D} g$

$x = \frac{m g}{k} (1 - \frac{d}{D})$

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6 months ago

Physics Class 11th

In a rocket, fuel burns at the rate of 1 $k g / s .$ This fuel is ejected from the rocket with a velocity of 60 $k m / s$ . This exerts a force on the rocket equal to

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Raj Pandey

Contributor-Level 9

Rate of burning of fuel $(\frac{d m}{d t}) = 1 k g / s$ and velocity of ejected fuel

$(v) = 60 k m / s$

$= 60 * 1 0^{3} m / s .$

Forcev = Rate of change of momentum

$= \frac{d p}{d t} = \frac{d (m ν)}{d t} = v \frac{d m}{d t} = (60 * 1 0^{3}) * 1$

$= 60000$ N.

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6 months ago

Physics Dual Nature of Radiation and Matter

An electron of mass ' $m$ with an initial velocity $\overset{?}{v} = v_{0} \overset{?}{i}$ is in electric field $\overset{?}{E} = E_{0} \overset{?}{j}$ . If $λ_{0} = \frac{h}{m v_{0}}$ , its de Broglie wavelength at time ' $t$ ' is given by (Check the symbols for vectors)

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alok kumar singh

Contributor-Level 10

$\overset{?}{F} = e E_{0} \overset{?}{j}$

${\overset{?}{a}}_{y} = \frac{e E_{0}}{m} \overset{?}{j}$

$= v_{0} \overset{?}{i} + (\frac{e E_{0} t}{m}) \overset{?}{j}$

$|\overset{?}{v}| = \sqrt[]{v_{0}^{2} + {(\frac{e E_{0} t}{m})}^{2}} = v_{0} \sqrt[]{1 + {(\frac{e E_{0} t}{m})}^{2}}$

$λ = \frac{λ_{0}}{\sqrt[]{1 + {(\frac{e E_{0} t}{m})}^{2}}}$

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New answer posted

6 months ago

Physics Class 11th

A 10 N force is applied on a body produce in it an acceleration of 1 m/s². The mass of the body is

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Raj Pandey

Contributor-Level 9

Force $(F) = 10 N$ and acceleration

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6 months ago

Physics Electromagnetic Induction

A square loop of side l is laced at a separation of with a very long wire AB, in same plane. If the current through BA is increasing in the direction shown, the induced current produced in the loop is

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Vishal Baghel

Contributor-Level 10

From Lenz law, current in the square loop will be in anticlockwise sense.

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6 months ago

Physics Class 12th

Electric field in a region is $\vec{E} = 3 \hat{j} N / C .$ Equipotential surfaces are parallel to

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Vishal Baghel

Contributor-Level 10

Direction of is perpendicular to equipotential surface.

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6 months ago

Physics Physics Magnetism and Matter

Which of the following represent the variation of intensity of magnetization (I) versus magnetizing force (H) graph for a diamagnetic substance?

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Vishal Baghel

Contributor-Level 10

For diamagnetic ; $χ < 0 a n d l = χ H$

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6 months ago

Physics Class 11th

Two blocks of masses 6 kg and 4 kg are connected by a rope of mass 2 kg are resting on a frictionless floor as shown in the following figure. If a constant force of 60 N is applied to 6 kg block, then the tension in the rope at points A,B and C are, respectively, given by