How did Aristotle apply the scientific method to lunar eclipses?
What will be an ideal response?
He noted that during all lunar eclipses, the Earth always casts a circular shadow considerably larger than the Moon's disk, so hypothesized the Earth was in fact a sphere and predicted that future eclipses would show the same curved shadow of Earth.
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The pin at A in Problem 3.7 is removed and the pole rests on a rough surface at A in the position shown in the figure below. The minimum coefficient of friction at A required for equilibrium is:
(A) 0.41
(B) 0.25
(C) 0.37
(D) 0.64
What mission landed on Titan in early 2005?
A) Galileo's probe B) Huygens C) New Horizons D) Rover Spirit E) Cassini orbiter
Name the four principal types of solar-system debris; pair them up in terms of composition
What will be an ideal response?
A 1000-kg car is slowly picking up speed as it goes around a horizontal curve whose radius is 100 m. The coefficient of static friction between the tires and the road is 0.350. At what speed will the car begin to skid sideways?
A) 9.25 m/s B) 23.6 m/s C) 34.3 m/s D) 35.0 m/s E) 18.5 m/s