Ear | MCQs

Explanation

Jupiter's diameter is about 11 times the diameter of Earth.

Jupiter is the largest planet in our solar system.

Explanation

Explanation

Explanation

Explanation

When a satellite orbits close to the Earth's surface, it must travel faster to avoid falling towards the Earth due to gravity. This means its speed is maximum.

Since kinetic energy (KE) is proportional to the square of the speed (v), the kinetic energy will also be maximum:

KE = (1/2)mv^2

where m is the mass of the satellite.

So, when a satellite orbits close to the Earth's surface, its kinetic energy will be maximum.

Explanation

To calculate the moment of inertia of the Earth about its diameter, we can use the formula for the moment of inertia of a sphere:

I = (2/5)MR^2

where:

I = moment of inertia

M = mass of the Earth (10^25 kg)

R = radius of the Earth (diameter/2 = 12800 km / 2 = 6400 km = 6.4 × 10^6 m)

Plugging in the values, we get:

I = (2/5) × 10^25 kg × (6.4 × 10^6 m)^2

= (2/5) × 10^25 kg × 4.096 × 10^13 m^2

= 1.6384 × 10^38 kg m^2

≈ 1.64 × 10^38 kg m^2

Explanation

Explanation

Equinox occurs when the sun is vertically above the equator.

At this time, the sun equally illuminates the Southern and Northern hemisphere.

At this time the world experiences equal day and night.

Equinox occur twice a year.

The months are March and September.

Explanation

The change in seasons is caused by the inclination of Earth's axis (about 23.5°) and its orbit around the Sun.

As Earth orbits the Sun, different parts of the planet receive varying amounts of sunlight.

This leading to changes in temperature and weather patterns, resulting in seasons.

Explanation

• The Equator is an imaginary line that runs east-west around the middle of the Earth, dividing it into the Northern Hemisphere and the Southern Hemisphere.
• It is located at 0° latitude (0° N or 0° S).