Deck 18: Orbital and Escape Velocities

Question 1

The path of an object near the Earth that is traveling at greater than the escape velocity is

A) circular
B) elliptical
C) parabolic
D) hyperbolic

Answer 1

hyperbolic

Question 2

The higher the orbit above the Earth, the

A) slower the orbital speed.
B) faster the orbital speed.
C) greater the mass.
D) lesser the mass.

Answer 2

slower the orbital speed.

Question 3

The orbital velocity is determined by the fact that gravity is balanced by ______.

A) acceleration
B) velocity
C) antigravity
D) centripetal force

Answer 3

centripetal force

Question 4

The velocity to escape a planet depends on the planet's mass and ______.

A) radius
B) density
C) period
D) semi major axis

Question 5

The ____________ is the speed needed to leave the gravity of an object.

Question 6

_____________ is the velocity needed to balance the centripetal and gravitational force.

Question 7

The orbital velocity can be expressed as v=(Gm/r)^1/2.

Question 8

The parabola and hyperbola are orbits for objects that will never return.