Answer:
about 3.17647 hours
Explanation:
The appropriate relation is ...
time = distance/speed
time = (270 km)/(85 km/h) = 3 3/17 h ≈ 3.17647 h
It will take Derek about 3.17647 hours to drive the distance.
Astronomers learn about the internal structure and evolution of stars by using spectroscopy and observing their luminosity.
New stars form in nebulae, interstellar gases and dust clouds leftover from supernovas.
Supernovas are the results of stars running out of its nuclear fuels.
The lifespan of a massive star is shorter than a star like the Sun because massive stars have very high pressures and temperatures at their cores and therefore burn their nuclear fuels faster. Stars grow larger as they age.
I think the answer will be A
The centrifugal force working against the car would be the entire car's weight, so the centripetal force that is supplied to the car must be the car's tires traction, aka the friction of the car's tires and the surface.