How far can a person run in 0.25hr if he or she runs at a average speed of 16km/he?
1 answer:
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Answer:
No she cannot.
Explanation:
Let be the horizontal component of the ball velocity when it's kicked, assume no air resistance, this is a constant. Also let
be the vertical component of the ball velocity, which is affected by gravity after it's kicked.
The time it takes to travel 95m accross the field is
or
t is also the time it takes to travel up, and the fall down to the ground, which ultimately stops the motion. So the vertical displacement after time t is 0
where g = -9.8m/s2 in the opposite direction with
Since the total velocity that the goal keeper can give the ball is 30m/s
Let substitute x = > 0
We can multiply both sides by x
As
The solution for this quadratic equation is indefinite
So it's not possible for the goal keeper to do this.
To solve this problem, we must basically count the total energy lost converting all the values given in the international system.
The energy loss is given by both 124KJ and 124food heats.
Since the energy conversion we know that 1 food calories is equal to 4,184J. So:
Therefore the total energy lost will be
Therefore the total energy lost to the surroindings in form of heat is 124.518kJ