11,550 km has to be changed to 11,550,000 meters

G · m · t² = 4 · π² · r³ we can change that to
t² = (4 · π² · r³) / (G · m )
t^2 = 4*PI^2*r^3 / (G*m)
t^2 = 4*PI^2*(11,550,000)^3 / 6.67*10^-11*5.98*10^24kg
t^2 = 6.083*10^22 / 3.99 * 10^14
t^2 = 152,500,000
t = 12,350 seconds
and its orbital distance it travels is 11,550 * 2*PI = 70,050 kilometers

Therefore, it is traveling at 70,050 km / 12,350 second which equals
5.67 km per second which is 5,670 meters per second.

Source:
http://www.1728.org/kepler3a.htm

4 0

4 years ago

A researcher surveyed 80 adults and found that 22 regularly run for exercise and 18 regularly swim for exercise.

Aliun [14]

Whenever the questions asks for the probability and has "or" you have to add the two probabilities. In the same way, "and" implies multiplication. Therefore, the probability that someone swims is:
$\frac{18}{80} = \frac{9}{40}$

Probability that someone runs:
$\frac{22}{80} = \frac{11}{40}$

Thus, if you add them:
$\frac{9}{40} + \frac{11}{40} = \frac{20}{40} = \frac{1}{2}$

So, the probability that someone swims or runs is 1/2 or 50%.

6 0

3 years ago