chapter 10

Question 1

Projectile

Answer 1

Any object that moves through the air or through space under the influence of gravity.

Question 2

Parabola

Answer 2

the curved path follow by a projectile under the influence of only constant gravity.

Question 3

Satellite

Answer 3

A projectile of a small celestial body that orbits a larger celestial body.

Question 4

Ellipse

Answer 4

the oval-shaped path followed by a satellite. The sum of the distances from any point on the path to two points called foci is a constant. When the foci are together at one point, the ellipse is a circle. As the foci get farther apart, the ellipse becomes more eccentric

Question 5

Keplers 1st law

Answer 5

the path of each planet around the sun is an ellipse with the sun at one focus

Question 6

Keplers 2nd law

Answer 6

the line from the sun to any planet sweeps out equal areas of space in equal time intervals.

Question 7

Keplers 3rd law

Answer 7

The square of the orbital period of a planet is directly proportional to the cube of the average distance of the planet from the sun (t^2 ~r^3 for all planets.)

Question 8

Escape speed

Answer 8

The speed that a projectile, space probe, or similar object must reach to escape the gravitational influence of earth or of another celestial body to which it is attracted.