Answer:
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Explanation:


?

Now, let's find the mass:

plug the values
⇒
Multiply the numbers
⇒
Swap the sides of the equation
⇒
Divide both sides of the equation by 270.48
⇒
Calculate
⇒
kg
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Answer:
42.11 years old
Explanation:
Given that:
In 2000, a 20-year-old astronaut left Earth to explore the galaxy; her spaceship travels at 2.5 x 10^8 m/s. She returns in 2040
To find her age we use:

Δtm is time interval for the observer stationary relative to the sequence of
events = 2040 - 2000 = 40 years
Δts is is the time interval for an observer moving with a speed v relative to the sequence of event
v = velocity = 2.5 x 10^8 m/s
c = speed of light = 3 x 10^8 m/s

Here age in 2000 is 20 year, therefore when she appear she would be 20 year + 22.11 year = 42.11 years old
“a point representing the mean position of the matter in a body or system.”