Exam (elaborations)
PHY M06
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Exam of 2 pages for the course studies at studies (PHY M06)
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PHY M06Planet A has twice the mass of Planet B. From this information, what can we conclude
about the acceleration due to gravity at the surface of Planet A compared to that at the
surface of Planet B? - ANS-We cannot conclude anything about the acceleration due to
gravity on Planet A without knowing the radii of the two planets.
Two small balls, A and B, attract each other gravitationally with a force of magnitude F. If
we now double both masses and the separation of the balls, what will now be the
magnitude of the attractive force on each one? - ANS-F
Two small objects, with masses m and M, are originally a distance r apart, and the
magnitude of the gravitational force on each one is F. The masses are changed to 2m
and 2M, and the distance is changed to 4r. What is the magnitude of the new
gravitational force? - ANS-F/4
A hypothetical planet has a mass of one-half that of the earth and a radius of twice that
of the earth. What is the acceleration due to gravity on the planet in terms of g, the
acceleration due to gravity at the surface of the earth? - ANS-g/8
Two planets have the same surface gravity, but planet B has twice the mass of planet A.
If planet A has radius r, what is the radius of planet B? - ANS-r sqrt(2)
At a given point above Earth's surface, the acceleration due to gravity is equal to What
is the altitude of this point above Earth's surface? (G = 6.67 × 10-11 N m2/kg2, Mearth =
5.97 × 1024 kg, Rearth = 6.38 × 106 m) - ANS-770 km
The planet Jupiter is 7.78 × 1011 m from the sun. How long does it take for Jupiter to
orbit once about the sun given that the distance from the earth to the sun is 1.50 × 1011
m? - ANS-12 years
A 250-kg motorcycle goes around an unbanked turn of radius 13.7 m at a steady 96.5
km/h. What is the magnitude of the net force on the motorcycle? - ANS-1.31 x 10^4
Planet Z-34 has a mass equal to one-third that of Earth and a radius equal to one-third
that of Earth. With g representing, as usual, the acceleration due to gravity at the
surface of Earth, the acceleration due to gravity at the surface of Z-34 is - ANS-3g
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