Explanation:
Given:




Let
= mass of the asteroid and
= orbital radius of the asteroid around the sun. The centripetal force
is equal to the gravitational force 

or

where

with T = period of orbit. Rearranging the variables, we get

Taking the square root,



Answer: 184,615,384.6 years
Explanation:
This problem can be solve by the following equation:
(1)
Where:
is the spreading rate of the seafloor, its velocity
is the distance the Africa's west coast moved at this rate
is the time it took to the coast to move the descibed distance
Isolating
from (1):
(2)
(3)
Finally:
This is the time it took to the Africa's west coastto move away from the Mid atlantic ridge.
Answer:
133.62 kmh.
Explanation:
Time provided = 3.25 hours.
Distance to be covered 300 km
Times spent in first 100 km = 1 hour
Time spent in next 43 km
= 43 / 40 = 1.075 hours
Total time spent = 2.075 hours
Total distance covered = 143 km
Distance remaining = 300 - 143
=157 km .
Time remaining = 3.25 - 2.075
= 1.175
Speed required = Distance remaining / time remaining
= 157 / 1.175
= 133.62 kmh.
AnswerNo
However, the acceleration is the opposite of the movement:
Explanation:
Mass= density x volume
1.3 kg/m^3 x ( 2.5x4x10) m^3
= 130 kg