# Science

Which statement is true about the motion of a planet in its orbit around the sun?

A) the orbital speed increases as the planet approaches apogee

B) the planets orbital speed changes as it moves closer and farther from the sun

C) perigee is when the orbital speed is at its least

D) the orbital speed of the planet remains constant as it orbits the sun

I put b. Can someone tell me if I’m right or not pls

1. 👍
2. 👎
3. 👁
4. ℹ️
5. 🚩
1. If a planet existed that had a period twice that of earth, what would be the length of the semi-major axis as it orbits the sun

A) 2.83 AU
B) 2 AU
C) 1.59 AU
D) 4 AU

I put 2.83 AU
Can someone tell me if this is right too pls?

1. 👍
2. 👎
3. ℹ️
4. 🚩
2. I also need help with this one, but I have no idea what the answer is. Can someone pls help me

If a planet had a semi-major axis length of 2.3 AU as it orbits the sun, what would be its period in years?

A) 12.2 years
B) 1.74 years
C) 2.3 years
D) 3.49 years

1. 👍
2. 👎
3. ℹ️
4. 🚩
3. Never mind the answer is
D) 3.49 years

Cuz when you do
T^2=s^3
S=2.3
T^2= (2.3)^3
T^2 = square root of 12.167
T^2 = 3.488

1. 👍
2. 👎
3. ℹ️
4. 🚩
4. I submitted it. I got everything right except the 2nd question. It was actually 1.59 AU

1. 👍
2. 👎
3. ℹ️
4. 🚩
5. T = constant * R sqrtR
say T = R^1.5 since only ratios important
if R = 10
it T= 10
R^1.5 = 10
1.5 log R = 1
logR = 1/1.5
R = 4.64
if R = 20
logR = 1.3/1.5
R = 7.35
7.35 / 4.64 = 1.584

1. 👍
2. 👎
3. ℹ️
4. 🚩
6. 1. D. Elliptical
2. C. The sun is located at one focus.
3. C. The planet's orbital speed changes as it moves closer and farther from the Sun.
4. A. 1.59 AU
5. C. 3.49 Years

Hope this helps

1. 👍
2. 👎
3. ℹ️
4. 🚩

## Similar Questions

1. ### Math

The period of revolution of a planet around the sun is the time it takes for the planet to complete one orbit of the sun. The period, P years, is give by Kepler's third law P^2=D^3, where D is the average distance from the sun in

2. ### Physics

The radius of the earth's orbit around the sun (assumed to be circular) is 1.50 X 108 km, and the earth travels around this orbit in 365 days. (a) What is the magnitude of the orbital velocity of the earth, in m/s? (b) What is the

3. ### Science

Kepler's Second Law Quick Check. Hello! if you want to check your answers here is a guide to compare your answers. Please keep in mind answers may vary from school. 1. Which does Kepler’s second law state about planetary motion?

4. ### AP Physics Halley's Comet

Halley's comet orbits the sun roughly once every 76 years. It comes very close to the surface of the Sun on its closest approach. Estimate the greatest distance of the comet from the sun. Is it still in the Solar System? What

1. ### physics

A planet with mass 5.37×1024kg and radius 6.51×106m orbits its sun, a distance 141.68×109m away, in a uniform circular motion w/ velocity 3.3×104m/s. Assuming the planet is a uniform solid sphere spinning on its axis and has

2. ### physics

The mean distance of the planet Neptune from the Sun is 30.05 times the mean distance of Earth from the Sun. a.) Determine how many Earth-years it takes Neptune to orbit the Sun. b.) The mass of the Sun is 1.99 x 10^30 kg, and the

3. ### physics

A satellite has a mass of 5850 kg and is in a circular orbit 3.8 105 m above the surface of a planet. The period of the orbit is two hours. The radius of the planet is 4.15 106 m. What is the true weight of the satellite when it

4. ### Science

Kepler's First and Third Laws Quick Check Hi! please keep in my mind that answers vary for each school. and be careful not to fall people who use false answers 1. Which planet’s orbit was Kepler first studying when he began to

1. ### Physics

Our sun rotates in a circular orbit about the center of the Milky Way galaxy. The radius of the orbit is 2.2 1020 m, and the angular speed of the sun is 1.2 10-15 rad/s. (a) What is the tangential speed of the sun? m/s (b) How

2. ### Astronomu

1. There is a common misconception about why the Earth is cold in the winter and warm in the summer. Some believe that this is because the Earth, in its elliptical orbit, is closer to the Sun in the summer and farther away in the