Explanation

Explanation

Potential energy is the energy an object has due to its position or state.

For example, being elevated in a gravitational field.

It can potentially do work if it moves.

Explanation

Scalar quantities are physical quantities that have only magnitude (amount or size) but no direction.

Examples of scalar quantities include:

• Mass
• Temperature
• Time
• Energy
• Distance

Explanation

Samuel Colt patented the revolver in 1836.

He revolutionizing firearms with its rotating cylinder.

Explanation

Uranus is four times the size of the Earth.

Uranus appears greenish in color because of the large amount of methane gas present in its atmosphere.

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Explanation

In a gas meter, gears are connected to the wheel mechanisms to accurately transfer and display the volume of gas consumed.

These gears rotate the dials based on the gas flow, providing precise readings.

Explanation

When two resistances of 2Ω each are connected in parallel:

1/R = 1/R1 + 1/R2

= 1/2 + 1/2

= 2/2

= 1

R = 1Ω

Explanation

The pair of physical quantities with the same dimensions is Work and Energy.           

Both work and energy have the same dimensional formula: ML²T⁻²

Explanation

Concave mirrors or lenses were used to focus sunlight onto a single point.

This focused sunlight generated high temperatures for cooking or heating.

Explanation

Frequency is calculated using the formula:

f = v / λ

where v = 8 m/s (speed), λ = 2.5 m (wavelength)

So, f = 8 / 2.5 = 3.2 Hz