Physics Questions and Answers

The working of the beam balance is based on the principle of moments. The principle of moments states that the sum of the clockwise moments on a beam must be equal to the sum of the counterclockwise moments on the beam. This means that the weight of the object on the left side of the beam must be multiplied by the distance from the fulcrum to the left side of the beam, and the weight of the object on the right side of the beam must be multiplied by the distance from the fulcrum to the right side of the beam. If these two products are equal, then the beam will be in equilibrium.

Mechanics is the branch of physics that deals with the motion of objects and the forces acting on them. It is the foundation of all other branches of physics, and it is used to study everything from the motion of planets to the motion of electrons.

q=$4.6 × 10^{-5}$, C=   $3.2 × 10^4$ $Vm^{-1}$ F= ?

F=qE

⇒ $4.6 × 10^{-5}$C × $3.2 × 10^4$

; F= 1.5 N

d=312m.,T =263$-10^°c$ = -10+273K = 263K, t=?

v= 331√ $\frac{T}{273}$

⇒ v = 331×√ $\frac{263}{273}$

⇒ v = 324.88 $ms^-1$

⇒ v = $\frac{d}{t}$

t = $\frac{d}{t}$ = $\frac {312}{324.88}$

t = 0.96s

 

The penetrating power of alpha rays, beta rays, and gamma rays varies greatly. Alpha particles can be blocked by a few pieces of paper. Beta particles pass through paper but are stopped by aluminum foil. Gamma rays are the most difficult to stop and require concrete, lead, or other heavy shielding to block them.

Therefore, X = γ-ray; Y = α-particle; Z = β-particle