For a moon orbiting its planet, rp is the shortest distance between the moon and its planet and ra is the longest distance between the moon and its planet. What is a moon's orbital eccentricity if rp is equal to 0.27ra ?(1 point) Responses 0.27 0.27 0.57 0.57 0.65 0.65 0.48

Answer 1

The eccentricity of a moon's orbit can be calculated using the formula:

eccentricity = (ra - rp) / (ra + rp)

Given that rp = 0.27ra, we can substitute this value into the formula:

eccentricity = (ra - 0.27ra) / (ra + 0.27ra)
= 0.73ra / 1.27ra
≈ 0.57

Therefore, the moon's orbital eccentricity is approximately 0.57.

Answer 2

The mass of an object doubles. What happens to the gravitational force between it and another object whose mass stays the same, assuming they remain the same distance apart?(1 point) Responses The amount of the gravitational force remains the same. The amount of the gravitational force remains the same. The amount of the gravitational force decreases by one-half. The amount of the gravitational force decreases by one-half. The amount of the gravitational force doubles. The amount of the gravitational force doubles. The amount of the gravitational force quadruples.

Answer 3

The amount of the gravitational force doubles.

Answer 4

Based on Kepler's observations about planetary motion, what is the relationship between a planet's orbital velocity and its distance from the sun?(1 point) Responses The greater the distance, the slower the orbital velocity. The greater the distance, the slower the orbital velocity. As distance is cut in half, orbital velocity decreases. As distance is cut in half, orbital velocity decreases. The greater the distance, the greater the orbital velocity. The greater the distance, the greater the orbital velocity. Distance has no effect on orbital velocity.

Answer 5

The greater the distance, the slower the orbital velocity.

Answer 6

What shape is the moon's orbit around Earth?(1 point) Responses a circle a circle an ellipse that is almost circular an ellipse that is almost circular an ellipse that is elongated an ellipse that is elongated a spiral

Answer 7

The shape of the moon's orbit around Earth is an ellipse that is almost circular.

Answer 8

Which are features of Copernicus's model of the solar system? Select the three correct answers.(2 points) Responses Earth is fixed to a crystalline sphere. Earth is fixed to a crystalline sphere. The planets move in perfect circles. The planets move in perfect circles. The outer planets move in epicycles. The outer planets move in epicycles. All planets orbit the Sun at the same speed. All planets orbit the Sun at the same speed. The stars are fixed to an outer sphere. The stars are fixed to an outer sphere. The Sun is at the center.

Answer 9

The three correct features of Copernicus's model of the solar system are:

1. The planets move in perfect circles.
2. All planets orbit the Sun at the same speed.
3. The Sun is at the center.