Class 11th

Density of metal a very specific and depends upon many factors.

Li -> 0.53 gm/cm³

Na -> 0.97 gm/cm³

K -> 0.86 gm/cm³

Rb ->1.53 gm/cm³

Cs -> 1.90 gm/cm³

$\left[N{H}_{4}Cl\right]=\frac{2}{60}=\frac{1}{30}M$

$pH=7-\frac{1}{2}P{K}_b-\frac{1}{2}logC$

$=7-\frac{5}{2}-\frac{1}{2}log\left(\frac{1}{30}\right)=5.24$

Magnetic energy per unit volume $=\frac{{\mathrm{B}}^2}{2{?}_0}$

$\mathrm{}{W}_{\text{equator}}=W_{\text{pole}}-m{\omega }^{2}R$

$\begin{array}{rr}& =196-19.6*{\left(\frac{2\pi }{24*60*60}\right)}^2*6400*{10}^3\\ & =195.33\mathrm{N}\end{array}$

Value of n & $\mathcal{l}$ $$ can't be same

Please find the solution below:

The principle of circular motion follows Newtonian mechanics. It can be stated that an object will move in a circle only when there is a centripetal force that continuously acts perpendicular to its tangential velocity. That changes the direction but not its speed. The inward acceleration a_c = v squared/r obeys Newton's laws and ensures circular path motion. 

Circular motion has the following characteristics.

• Fixed radius with the same and constant distance from the centre
• Constant speed, when the motion is uniform
• A changing velocity vector with continuous direction of change
• Centripetal acceleration that is directed radially inwards, while the force that causes it is the centripetal force that maintains the curved path

(A) Sulphate (>500 ppm) ® causes laxative effect that leads to dehydration.

(B) Nitrate (> 50 ppm) ® causes methemoglobinemia, skin appears blue.

(C) Lead (>50 ppb) ® It damage kidney and RBC.

(D) Fluoride (>2ppm) ® It causes brown mottling of teeth.

$\mathrm{W}={\mathrm{Q}}_1-{\mathrm{Q}}_2={\mathrm{Q}}_2-{\mathrm{Q}}_3$

${\mathrm{Q}}_2=\frac{{\mathrm{Q}}_1+{\mathrm{Q}}_3}{2}$

$2=\frac{{\mathrm{Q}}_1}{{\mathrm{Q}}_2}+\frac{{\mathrm{Q}}_3}{{\mathrm{Q}}_2}$

$2=\frac{T_1}{T}+\frac{T_2}{T}$

$\mathrm{T}=\frac{{\mathrm{T}}_1+{\mathrm{T}}_2}{2}$