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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.
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