Explanation

In uniform circular motion, there is no angular acceleration (α = 0).

Since torque τ = Iα, and α = 0, torque is zero (τ = 0 Nm).

Explanation

Young's Modulus is the ratio of stress to strain and measures stiffness of a material.

Since stress is measured in N/m² (or Nm⁻²) and strain is dimensionless, the unit remains Nm⁻².

Explanation

Formula:

Gravitational Potential Energy (GPE) = m × g × h

Where:

m = mass = 12 kg

g = gravitational acceleration = 9.8 m/s²

h = height = 5 m

GPE = 12 × 9.8 × 5 = 588 J

Explanation

F ∝ m1m2

If both masses are doubled, F' ∝ (2m1)(2m2) = 4m1m2

So, F' is 4 times F.

Explanation

A cyclone refers to a large system of winds rotating around a low-pressure center, covering several kilometers.

A twister (or tornado) is much smaller in scale.

Explanation

A linear scale uses a line marked with distances to represent the scale on a map.

It helps measure actual distances directly by comparing with the marked segments on the line.

Explanation

Centripetal force is any force that keeps an object moving in a circular path, directed toward the center of the circle.

Tension in a string, gravitational force (like planets orbiting), and friction (like a car turning) can all provide centripetal force.

Explanation

Power = 1/f (in meters)

f = 8 cm = 0.08 m

Power = 1/0.08 = 12.5 D

Explanation

Loudness is how the intensity of a sound is perceived by the human ear.

Greater intensity → louder sound.

It is measured in decibels (dB).

Explanation

Infrasonic sounds have frequencies below 20 Hz, which are too low for human hearing.

Ultrasonic refers to sounds above 20,000 Hz.

Audible is the range between 20 Hz and 20,000 Hz.