Explanation

• When the air above the land is heated during the daytime, its density decreases.
• This is because warm air expands and becomes less dense than cold air.

Explanation

• Heat is a form of energy associated with the motion of molecules in a substance.
• As molecules vibrate, rotate, and collide, they transfer energy from one another, resulting in the sensation of heat.

Explanation

The speed of sound is maximum in Helium because:

• Sound travels faster in lighter gases.
• Helium is lighter than both platinum and oxygen.
• The speed of sound is directly proportional to the square root of the gas's temperature and inversely proportional to the square root of its molecular mass.

Explanation

Explanation

Explanation

Explanation

Work done (W) is given by:

W = F * d

where F is the force applied and d is the displacement.

Since the mass of the box is 2 kg and a force of 50 N is applied for 2 seconds, we can calculate the acceleration (a) using:

F = m * a

a = F / m

= 50 / 2

= 25 m/s²

The displacement (d) can be calculated using:

d = (1/2) * a * t²

where t is the time.

d = (1/2) * 25 * (2)²

= 50 m

Now, we can calculate the work done:

W = F * d

= 50 * 50

= 2500 J

Explanation

Explanation

Explanation