Risk of return on investment is higher than other forms of energy generation.
Answer: Kinetic frictional force = 23.76N
Explanation: Please see the attachments below
D. Genetic variation increases the likelihood of an allele being present that is best suited for the environment.
The gravitational force between two objects is given by:

where
G is the gravitational constant
m1 and m2 are the masses of the two objects
r is the separation between the two objects
The distance of the telescope from the Earth's center is

, the gravitational force is

and the mass of the Earth is

, therefore we can rearrange the previous equation to find m2, the mass of the telescope: