Question

The escape velocity at the surface of Earth is approximately 11 km/s. What is the radius, in units of R (the radius of the Earth), of a planet with twice the mass of Earth for which the escape speed is twice that for Earth?

8R |

2R |

R/4 |

R/2 |

R |

Answer #1

Planet Zeta-7 has a surface gravitational acceleration of 1.84
m/s² and a surface escape velocity of 2.75 km/s. Planet Alpha-9 has
a mass that is 2.3 times that of Zeta-7 and a radius that is 3.1
times that of Zeta-7. What is escape velocity from the surface of
Alpha-9?

Consider a planet with twice the mass and twice the radius of
Earth. Its escape speed is how many times that of Earth?
A. 0.25
B. 0.5
C. 1
D. 2
E. 4
Fully explain

The escape velocity of a bullet from the surface of planet Y is
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Consider a planet with a surface temperature of 50 K an escape
speed of 30 km/s. What type of planet must this be?
A. Jovian
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(b) How far from the surface will a particle go if it leaves the
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(c) With what speed will an object hit the asteroid if it is
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(a)
What is the escape speed on a spherical asteroid whose radius is
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is greater than the escape speed). Ignore friction and all other
objects in the universe, and assume the projectile has no fuel.
Find the speed of the projectile, in m/s, when it reaches Earth,
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In the 23rd century, an Earth probe to the
planet Altair IV (mass 1.05x1024 kg, radius
3.68x106 m) has a communications failure. To request
assistance, a small projectile is shot toward Earth from the
surface of the planet, at speed 17.5x103 m/s (which is
greater than the escape speed). Ignore friction and all other
objects in the universe, and assume the projectile has no fuel.
Find the speed of the projectile, in m/s,when it reaches Earth,
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In the 23rd century, an Earth probe to the
planet Altair IV (mass 3.5x1024 kg, radius
5.08x106 m) has a communications failure. To request
assistance, a small projectile is shot toward Earth from the
surface of the planet, at speed 18x103 m/s (which is
greater than the escape speed). Ignore friction and all other
objects in the universe, and assume the projectile has no fuel.
Find the speed of the projectile, in m/s, when it reaches Earth,
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Impacts! The relative velocity of an Asteroid impacting Earth
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a. Earth’s escape velocity is ~11 km/s, the Earth orbits the sun
at ~30 km/s, and an asteroid crossing Earth’s orbit would have
about the same velocity of ~30 km/s. What are the minimum and
maximum velocities of impact for an asteroid hitting Earth?
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