What are Kepler's three laws?
What will be an ideal response?
(1) The orbits of the planets are ellipses with the Sun at one focus.
(2) A line from a planet to the Sun sweeps over equal areas in equal intervals of time.
(3) A planet's orbital period squared is proportional to its average distance from the Sun cubed.
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Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the same direction. Jake's speed relative to the ground is
A) 6 m/s. B) 10 m/s. C) 14 m/s. D) none of the above
The atomic nuclei of the same element always have the same number of protons
Indicate whether the statement is true or false
A space vehicle is orbiting Earth in a circular orbit with a radius of 10,300,000 m
What is the minimum increase in speed that is needed for the vehicle to escape Earth's gravitational field? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 6220 m/s B) 2580 m/s C) 3110 m/s D) 2840 m/s E) 7440 m/s
The International Space Station has a mass 1.8 × 105 kg. A 70.0-kg astronaut inside the station pushes off one wall of the station so she accelerates at 1.50 m/s2
What is the magnitude of the acceleration of the space station as the astronaut is pushing off the wall relative to an observer initially at rest relative to the space station before the push? A) 5.8 × 10-4 m/s2 B) 1.50 m/s2 C) 4.7 × 10-4 m/s2 D) zero E) 3.9 × 10-3 m/s2