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Chapter 5: Q44. (page 134)
A certain neutron star has five times the mass of our Sun packed into a sphere about 10 km in radius. Estimate the surface gravity on this monster.
The surface gravity on this monster is .
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A curve of radius 78 m is banked for a design speed of 85 km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely make the curve? [Hint. Consider the direction of the friction force when the car goes too slow or too fast.]
Which pulls harder gravitationally, the Earth on the Moon, or the Moon on the Earth? Which accelerates more?
(a) The Earth on the Moon; the Earth.
(b) The Earth on the Moon; the Moon.
(c) The Moon on the Earth; the Earth.
(d) The Moon on the Earth; the Moon.
(e) Both the same; the Earth.
(f) Both the same; the Moon.
The Sun is below us at midnight, nearly in line with the Earth's centre. Are we then heavier at midnight, due to the Sun's gravitational force on us, than we are at noon? Explain.
The source of the Mississippi River, is closer to the centre of the Earth than is its outlet in Louisiana (because the Earth is fatter at the equator than at the poles). Explain how the Mississippi can flow "uphill."
On an ice rink two skaters of equal mass grab hands and spin in a mutual circle once every 2.5 s. If we assume their arms are each 0.80 m long and their individual masses are 55.0 kg, how hard are they pulling on one another?
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