This is a way of measuring how much gravity there is. The formula is: weight/mass = gravitational field strength.
Gravitational field strength = Weight/mass unit is N/kg
Weight = mass x gravitational field strength unit is N
On Earth the gravitational field strength is 10 N/kg. Other planets have different gravitational field strengths. The Moon has a gravitational field strength of 1.6 N/kg. You might have seen films of astronauts leaping high on the moon.
Here on Earth, if I jump I am pulled back to ground by gravity. What is my weight? My mass is 80kg and if we multiply by gravitational field strength (10N/kg) - my weight is 800N. Now if I go to the moon, my mass will be the same, 80kg. We multiply that by the moon's gravitational field strength, which is 1.6 N/ kg. That means my weight on the moon is 128N. So I have different weights on the Earth and on the Moon. That's why astronauts can jump high into the air on the moon - they're lighter up there.
Jupiter is a very large planet with strong gravitational field strength of 25 N/ kg. My body is 80kg. If I go to Jupiter my weight is going to be 25 x 80 = 2,000 N. That means I wouldn't be able to get off the ground or stand up straight! I would probably be lying down all the time there. So weight varies depending on which planet you are on. You can find out more yourself by looking up tables of weight on different planets.
Answer: The different speed of sound waves in water and in air
Explanation:
In general, sound (which is a mechanical wave) travels faster in solids than in liquids or gases. This is because the speed of mechanical waves is determined by a relationship between the elastic properties of the medium in which they are propagated and the mass per unit volume of the medium (that is: density).
In other words: The speed of sound varies depending on the medium through which the sound waves travel.
This is why Jason notices that sounds underwater (a liquid medium) are different from sounds above water (a gas medium: air).
The central nervous system.
Slinky waves refer to the waves represented by a spring/ slinky. It can be used to represent both longitudinal and transverse. Refer attached images below. Similarly, the seismic waves are of two types - longitudinal waves (P-type) and transverse waves (S-type). During an earthquake, the rupturing process causes the seismic waves to transfer energy without moving any material from one place to another. the P-type waves are faster than the S-types waves.
