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Chapter 5: Q17. (page 131)
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 weight becomes heavier due to the gravitational force of the Sun and Earth at midnight.
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Calculate the effective value of g, the acceleration of gravity, at (a) 6400 m, and (b) 6400 km, above the Earth’s surface.
Neptune is an average distance of \({\bf{4}}{\bf{.5 \times 1}}{{\bf{0}}^{\bf{9}}}{\bf{\;km}}\)from the Sun. Estimate the length of the Neptunium year using the fact that the Earth is \({\bf{1}}{\bf{.50 \times 1}}{{\bf{0}}^{\bf{8}}}{\bf{\;km}}\) from the Sun on average.
Why is more fuel required for a spacecraft to travel from the Earth to the Moon than to return from the Moon to the Earth?
Two objects attract each other gravitationally with a force of when they are 0.25 m apart. Their total mass is 4.00 kg. Find their individual masses.
Highway curves are marked with a suggested speed. If this speed is based on what would be safe in wet weather, estimate the radius of curvature for an unbanked curve marked 50 km/h. Use Table 4-2 (coefficients of friction).
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