Physics - Explore the discovery of planets around other stars. What methods did the astronomers use?

Explore the discovery of planets around other stars. What methods did the astronomers use? What measurements did they take? How did they use Kepler’s third law?

Answer:

Astronomers measure the star’s tiny velocity due to the gravitational force exerted on it by a massive planet. The velocity is calculated by measuring the Doppler shift of the star’s light that results from that motion. The velocity oscillates back and forth as the planets orbit the star, allowing calculation of the planet’s period. From the size of the velocity they can estimate the planet’s distance and mass. By comparing the distances and periods of planets in solar systems with multiple planets and using Kepler’s third law, astronomers can better separate the distances and masses of stars and planets.

Physics - As an astronaut in an orbiting space shuttle, how would you

As an astronaut in an orbiting space shuttle, how would you go about “dropping” an object down to Earth?

Answer:

To “drop” an object down to Earth, you would have to launch it backward at the same speed at which you are traveling in orbit. With respect to Earth, the object’s speed perpendicular to Earth’s gravity would be zero, and it could then “drop” down to Earth. However, the object is likely to burn up as a result of friction with Earth’s atmosphere on the way down.

Physics - Suppose two carts, one twice as massive as the other

Suppose two carts, one twice as massive as the other, fly apart when the compressed spring that joins them is released. How fast does the heavier cart roll compared to the lighter cart?

Answer:

According to Newton's Third Law, the forces on these two masses must be equal (and in opposite directions). According to Newton's Second Law, F = m a, we find a = F / m. That means the acceleration of the twice-as-massive cart will be one-half the acceleration of the other.

Telengana Plateau

Telengana Plateau, Telengana also spelled Telangana, plateau in western Andhra Pradesh state, southeastern India. Comprising the northeastern part of the Deccan plateau, the Telengana Plateau has an area of about 57,370 square miles (148,000 square km), a north-south length of about 480 miles (770 km), and an east-west width of about 320 miles (515 km). Mentioned in one of the Mauryan emperor Ashoka’s edicts, the region was successively ruled by the Satavahanas.

The plateau is drained by the Godavari River taking a southeasterly course; by the Krishna River, which divides the peneplain into two regions; and by the Penneru River flowing in a northerly direction. The plateau’s forests are moist deciduous, dry deciduous, and tropical thorn.

How did the Mali Empire begin?

Like many empires before and since, the Mali Empire began with conquest. The story is told by the poem, the Epic of Sundiata. Sundiata Kieta was the founder of the Mali Empire. Sundiata was the son of the King of the Mandinka people. A prophecy said he would become a great emperor. But, when his father died, the throne was taken by Sundiata’s brother. He went into exile at the court of the King of Mema, who made him one of his key advisors.

Meanwhile, the Sosso Empire conquered the Mandinka people. The Mandinka people asked Sundiata to help them. Still only 18 years old, Sundiata raised an army from Mema and, around 1235, won a great victory at the Battle of Kiriana. Sundiata Kieta was named Mansa (“Emperor”) of a new Mali Empire. Nicknamed “the Lion King” because of his success in battle, Sundiata conquered many other lands, turning his kingdom into a mighty new empire.

Map of Uganda with latitude and longitude

Question - How did Ivan the Great shape Muscovy and Russia?

How did Ivan the Great shape Muscovy and Russia?

Answer:

Ivan the Great issued strict laws, punished anyone who might be an enemy, and established a strong central government. He kept a tight grip on power and ordered great building projects in Moscow.

Question - If we reduce a map with a scale 1:50,000 by half, what will be the scale of the new map?

If we reduce a map with a scale 1:50,000 by half, what will be the scale of the new map?

Solution: Previous scale = 1:50,000 

The scale of the new map = 1/50,000 × 1/2 = 1/100,000 or 1:100,000 

The scale of the new map (1:100,000) is half of the scale of the old map (1:50,000).

Question - If we enlarge a map with a scale 1:200,000 two times,

If we enlarge a map with a scale 1:200,000 two times, what will be the scale of the new map?

Solution: Previous scale = 1: 200,000 or 1/200,000 

The scale of the new map = 1/200,000 × 2 = 1/100,000 or 1:100,000 

The scale of the new map (1:100, 000) is two times larger than the scale of the old map, (1: 200,000)

Question - What is the role of Rift Valley in the classification of Ethiopia

What is the role of Rift Valley in the classification of Ethiopia into different physiographic regions?

ANSWER:

The Rift Valley divides Ethiopia into two big parts – Western and Eastern parts. Then it helps create three physiographic regions; the Western Highlands and Associated Lowlands, the Southeastern Highlands and Associated Lowlands, and the Rift Valley Region.

Activity 3: Weather map in South Africa

Study the weather map above and answer the questions that follow.

3.1 Write the down temperature of the following places:

(a)Polokwane

(b) Mahikeng

(c) Durban

3.2 What is the weather forecast for Bloemfontein?

3.3 Name the city that is in the west coast and is expected to be sunny.

3.4 Which city is the hottest and what is the highest expected temperature?

3.5 Explain the weather that is expected in Cape Town.

Activity 3: Weather maps in the media - Answers

3.1 

(a) Polokwane – 27 degrees Celsius 

(b) Mahikeng - 28 degrees Celsius 

(c) Durban - 27 degrees Celsius

3.2 Bloemfontein is expected to be sunny with the maximum temperature of 28 degrees Celsius.

3.3 Springbok is in the west coast and is expected to be sunny.

3.4 The hottest city is Graaff Reinet has the highest expected temperature of 36 degrees Celsius.

3.5 Cape Town is expected to be cloudy with rain with the lowest temperature of 19 degrees Celsius.

Activity 5: Rainfall graph of Cape Town

Activity 5: Rainfall graph of Cape Town

The rainfall graph below shows the annual rainfall for Cape Town. Each column on the graph shows the number of millimeters of rain that fell in each month. Read and answer the questions that follow.

5.1 In which season does Cape Town receive most of the rain? 

5.2 Which month is the driest? 

5.3 Give the rainfall for in April and September. 

5.4 Name the three months which are the wettest? 

5.5 Which season is the driest?

Activity: 5 Rainfall graph of Cape Town - Answers 

5.1 Cape Town receives most of the rain in winter. 

5.2 November is the driest month. 

5.3 April and September received 40 mm of rain. 

5.4 June, July and August are the three wettest months. 5.5 The driest season is summer.

VIDEO: What is the difference between the UK, Great Britain, and England?

In this informative video, we explore the distinctions between the United Kingdom, Great Britain, and England. Join us on a journey through history and geography as we unravel the complexities of these terms and their significance. Learn about the unique identities of each region and gain a deeper understanding of the cultural and political landscape of Europe.

Question - QUIZ - Which of the following countries is a member of the South Asian Association for Regional Cooperation (SAARC)?

Which of the following countries is a member of the South Asian Association for Regional Cooperation (SAARC)?

(A) Myanmar

(B) Afghanistan

(C) Thailand

(D) Iran

ANSWER: 

(B) Afghanistan

SAARC has eight member countries (Afghanistan, Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan and Sri-Lanka).