Answer:
F = 7.143 kN
Explanation:
given,
time taken to apply break = 1.05 s
car slows down from 15 m/s to 9 m/s
mass of the car = 1250 Kg
force is equal to the change in momentum with respect to time.
F = -7142.85 N
F = - 7.143 kN
Force is acting opposite direction of velocity of car i.e. the sign is negative.
Following the definition of the center of mass, "In physics, the center of mass of a distribution of mass in space is the unique point where the weighted relative position of the distributed mass sums to zero."
(see explanation below)
Answer:
W = 1.545E6 J total work
P = W / t = 1.545E6 J / 3 sec = 5.15E5 J/sec = 515,000 J/sec (Watts)
Using definition of power
To my knowledge, it would be the day.
<em><u>one year: earth </u></em><em><u>revolves around the sun</u></em>
<em><u> one</u></em><em><u> month: moon revolution around the earth</u></em>
<em><u>one</u></em><em><u> day: the earth rotation about its axis</u></em>
However, nothing above indicates what day of the week it is; you can tell when a day has passed, but not what day of the week is.
Hope this helps!
-Moiselle