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Class 11th

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2 months ago

Class 11th Physics

A square of mass m is made of thin wire with sides of length a. Calculate the rotational inertia about the z-axis.

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Vishal Baghel

Contributor-Level 10

$I = \frac{m}{4} * \frac{a^{2}}{3} * 2 + \frac{m}{4} * (\frac{a^{2}}{12} + {(\frac{a}{2})}^{2} + a^{2}) * 2$

$= \frac{m a^{2}}{6} + \frac{2}{3} m a^{2} = \frac{m a^{2} + 4 m a^{2}}{6} = \frac{5 m a^{2}}{6}$

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Class 11th Motion in a Plane

An electron in a research apparatus follows a circle path. On the electron's first circuit of the apparatus, its speed is v₀ and the radius of its circular path is R. Each time it makes on circuit, it passes a short region where it receives a “kick” and gains an additional speed of $\frac{v_{0}}{100} .$ The electron follows a circular path such that the magnitude of its acceleration is always the same. What is the radius of the circular path after the electron has received 10 kicks?

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Vishal Baghel

Contributor-Level 10

$a = \frac{v_{0}^{2}}{R}$ $\frac{_{}^{}}{}$

after 10 kicks, $v = v_{0} + \frac{10 v_{0}}{100} = 1.1 v_{0}$ $_{} \frac{_{}}{}_{}$

$\Rightarrow R_{1} = 1.21 R$

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2 months ago

Class 11th Physics

A projectile travels at θ below horizontal 1 sec after projection as shown. What is the value of θ?

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Vishal Baghel

Contributor-Level 10

$t a n θ = \frac{v_{y}}{v_{x}} = \frac{u_{y} - g t}{u_{x}}$

$\Rightarrow t a n θ = | \frac{8 - 10}{4} | = | - \frac{1}{2} |$

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2 months ago

Class 11th Units and Measurement

Which of the following is a CORRECT statement?

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Vishal Baghel

Contributor-Level 10

(1) 2.3056 -> 4 decimals

10.138 -> 3 decimals

-7.4671 -> 4 decimals

_________________

4.9765

Answer should have 3 decimals.

(2) 2.38 * 1.0 = 2.38 -> answer should have 2 significant digits

(3) $\frac{8.05}{3.1} = 2.59 \approx 2.6$ answer should have 2SD

(4) 1.11 - 0.1 = 1.01 $\approx$ 1.0 but is an intermediate step so we keep 1 digit extra. 1.01 * 9.0 = 9.09 $\approx$ 9.1 -> both 1.01 and 9.0 have 2SD

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Class 11th Thermodynamics

In the above diagram if a systems from initial state A (P₁,V_1,T₁) goes to final state C (P₂ ,V₂ ,T₁) from 3 different paths: Path 1 is A to C, Path 2 is A to B to C, Path 3 is A to D to C If 5 kJ of work is done by system in Path A to C then how much heat is transferred during Path A to D is:

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Vishal Baghel

Contributor-Level 10

(0) Path A to D is adiabatic.

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2 months ago

Class 11th Redox Reactions

How many total moles of electrons are transferred when 1 mole of Cr₂O₇ ^2- oxidized Fe²⁺ to Fe³⁺ in acidic medium?

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Vishal Baghel

Contributor-Level 10

Kindly go through the answer

(6)

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2 months ago

Class 11th Structure of Atom

Shown below are portions of orbital diagrams representing the ground state electron configuration of certain elements. If 'x' of them violates Pauli exclusion principle and 'y' of them violates Hund's Rule then what is 'x' multiplies 'y'?

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Vishal Baghel

Contributor-Level 10

The Pauli exclusion principle states that no two electrons in an atom can have the same four quantum numbers. In other words, only two electrons may exist in the same atomic orbital, and these electrons must have opposite spins. (a) and (f) violate the Pauli exclusion principle. Hund's rule states that the most stable arrangement of electrons in subshells is the one with the greatest number of parallel spins. (b), (d) and (e) violate Hund's rule.

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Class 11th Chemistry

C₂H₅OH + KMnO₄ --> HC₂H₃O₂ +MnO₂ + KOH + H₂O is the unbalanced equation if 5g of ethanol & excess amount of aqueous KMnO4 are reacted and 5.5g of HC₂H₃O₂ result. What is the percent yield in the nearest integer? [Given: Atomic mass of H = 1, C = 12, O = 16]

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2 months ago

Class 11th Chemistry

Out of the following oxides of nitrogen how many of them are neutral oxides?

N₂O, NO, N₂O₃ , NO₂ , N₂O₄, N₂O₅

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Vishal Baghel

Contributor-Level 10

N₂O&NO

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2 months ago

Class 11th Chemistry

What is the formula and method of preparation of Hypophosphoric oxyacid?

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Vishal Baghel

Contributor-Level 10

Red phosphorus undergoes disproportionation on reaction with alkali to form H₄P₂O₆ and PH₃

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