TRUE OR FALSE? Exothermic reactions release energy.
1 answer:
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Answer:
Explanation:
since the ball was thrown at 0s and caought again at 5 s. applying eqaution of motion.
0 = u×5 - ×10×5×5
solving the eqaution we gaet initial velocity u = 25 m/s.
there fore total energy E = ×m×25×25 J
where m is the mass of the ball according to conservation of energy E remains constant
conservation of energy:
kinetic + potential energy of the ball = E
kinetic energy = E - mgh 1
h =
applying ot in the eqaytion 1
kinetic energy = e - 2
Therefore kinetic energy vs height will be a straight line with negative slope and kinetic energy vs time will be parabola that is open upward.
Answer:
The wife have to sit at 0.46 L from the middle point of the seesaw.
Explanation:
We need to make a sketch of the seesaw and the loads acting over it.
And by the studying of the Newton's law we can find the equation useful to find the distance of the mother sitting on the seesaw with respect to the center ot the pivot point.
A logical intuition will give us the idea that the mother will be on the side of her son to make the balance.
The maximum momentum with respect to the pivot point (0) will be:
Where L/2 is the half of the distance of the seesaw
Therefore the other loads ( mom + son) must be create a momentum equal to the maximum momentum.
