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1. An unknown planet is measuredtoproduce an acceleration of 6.0 m/s2 near itssurface.The radius is measured to be R = 4.5x10^5 m.

a. What is the mass oftheplanet?

b. How much kinetic energy wouldanobject of mass m = 10kg need to escape the gravitationalpull of the planet?

c. If an object ofmassm = 10 kg is fired fromthe surface of the planet intospace (radially outward) with aninitial speed of v =900m/s, then how high above the surface will it reach?

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Deanna Hettinger
Deanna HettingerLv2
15 Aug 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Question1.

Eris, the largest dwarf planet known in the Solar System, has aradius R = 1200 km and an acceleration due to gravity on itssurface of magnitude g = 0.77 m/s2.

(a) Use these numbers to calculate the escape speed from thesurface of Eris.
-> 1359.4116 m/s (Correct)

(b) If an object is fired directly upward from the surface of Eriswith half of this escape speed, to what maximum height above thesurface will the object rise? (Assume that Eris has no atmosphereand negligible rotation.)

-> 300047.8296 m (Incorrect) <======= This is my actualQuestion



Question 2.

A satellite is placed between the Earth and the Moon, along astraight line that connects their centers of mass.
The satellite has an orbital period around the Earth that is thesame as that of the Moon, 27.3 days. How far away from the Earthshould this satellite be placed?





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Answers for any questions are highly appreciated. HopefullyBoth

On July 4, 2005, the NASA spacecraft Deep Impact fired aprojectile onto the surface of Comet Tempel 1. This comet is about9.0 km across. Observations of surface debris released by theimpact showed that dust with a speed as low as 1.0 m/s was able toescape the comet.

1. Assuming a spherical shape, what is the mass of this comet? (The escape speed for an object at the surface of Earth is 11.2km/s).

Express your answer using two significant figures.
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This is a modification of example 7.5. An object (block, person,whatever) of mass 5.0 kg slides down a path (shape does not matter)from a height of 7.0 m to a height of 4.0 m with an initial speedof 2.0 m/s and a final speed of 6.0 m/s.

a) Determine the change in potential gravitational energy; take g =10 m/s2 ; the sign does matter
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