Final answer:
The question seeks to determine the gravitational force between Uranus and its moon Umbriel, which requires Newton's Law of Universal Gravitation and the masses and distance between the two objects. However, without Umbriel's mass and the correct distance units, the calculation cannot be completed.
Step-by-step explanation:
The question is asking to calculate the gravitational force between Uranus and its moon Umbriel. To calculate this, we need the mass of Uranus (which is 8.68x10²⁵ kg according to the question, but for accuracy, we'll use the provided reference value of 8.62x10²⁵ kg), the mass of Umbriel, and the distance between the two. However, the distance provided in the question (2.66) is incomplete without units. Assuming the distance should be in meters and we had Umbriel's mass, we could use Newton's Law of Universal Gravitation to find the gravitational force (F = G * m1 * m2 / r²). Without the complete information, specifically Umbriel's mass and the correct distance units, we cannot calculate the exact force.