Answer:
Work done, W = 401 kJ
Explanation:
It is given that,
Mass of the car, m = 1100 kg
Initial, velocity of the car, u = 27 m/s
Finally it stops, v = 0
According to work energy theorem, the change in kinetic energy is equal to the work done i.e.
W = -400950 J
or
-ve sign shows the direction of force and displacement are in opposite direction.
So, 401 kJ work is required to stop a car. Hence, this is the required solution.
Answer:
the answers are "mass" and "distance"
Explanation:
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Answer:
225 -250 million Earth-years
Explanation:
A galactic year or cosmic year is the time it takes for the Sun (and the solar system) to make an orbit around the center of the galaxy (Milky Way). The solar system travels at a speed of 828,000 Kilometers per hour (230 ).
So the time it takes to make this turn, measured in Earth years, should be between 225 and 250 million years.
It is a chemical change because you cannot undo rusting and a new substance- the rust- is formed