Motion, Forces, Energy

Front

What are electromagnetic waves?

Back

Electromagnetic waves are waves that can travel through a vacuum and do not require a medium. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Front

Why are electromagnetic waves used to detect supernovas instead of sound waves?

Back

Electromagnetic waves can travel in vacuums, while sound waves require a medium (like air or water) to propagate.

Front

What is the formula to calculate weight?

Back

Weight (W) = mass (m) × gravitational acceleration (g). In most cases on Earth, g is approximately 9.81 m/s².

Front

If a train has a mass of 18181.81 kg, what is its weight?

Back

Weight = 18181.81 kg × 9.81 m/s² = 178,182 N.

Front

What is power in physics?

Back

Power is the rate at which work is done or energy is transferred, measured in watts (W). 1 watt = 1 joule/second.

Front

How do you calculate work done?

Back

Work done (W) = power (P) × time (t).

Front

If 68 W of power is produced in 18 seconds, how much work is done?

Back

Work = 68 W × 18 s = 1,224 J.

Front

What are the different types of electromagnetic waves?

Back

The types include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Front

What is the speed of light in a vacuum?

Back

The speed of light in a vacuum is approximately 3.0 x 10^8 m/s.

Front

What is the difference between electromagnetic waves and sound waves?

Back

Electromagnetic waves can travel through a vacuum and do not require a medium, while sound waves need a medium to travel.