Answer:
a) No. The kinetic energy of the ball decreases.
b) The potential energy of the ball increases.
c) The ball would go half of the original distance.
Explanation:
a) The kinetic energy would be converted to potential energy as the ball goes higher. Since the total mechanical energy is conserved, the kinetic energy would decrease.
b) The potential energy of the ball would increase. Since the total mechanical energy of the ball is conserved, the ball would lose speed, and therefore kinetic energy. In order to compensate the loss of kinetic energy, the ball would gain potential energy as it goes higher.
c) The relation of the energy and mass is as follows:
According to the energy conservation
The maximum height that the ball reaches is proportional to the initial velocity. If the ball would be imparted with the same amount of energy, its final potential energy would be the same. However, in order to have the same potential energy (mgh), its height would be half of the original case.
Answer:
1. A car moving 40 mph has four times as much kinetic energy as one moving 20 mph, while at 60 mph a car carries nine times as much kinetic energy as at 20 mph. Thus a modest increase in speed can cause a large increase in kinetic energy.
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(B) All objects attract other objects
To be specific, the following formula defines this theory very clearly:
F = G * (m1 * m2) / r^2
The Force is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Answer:
<em>mg</em>
Explanation:
The only force which acts on the ball is its weight ( ) once it is thrown.
The weight acts downwards.
When the stone is thrown up, the final velocity at the maximum height is zero.
Initial velocity can be found by using law of conservation of energy.
Kinetic energy at the bottom = potential energy at the top
0.5 m v² = mgh
Answer:
Explanation:
Given
mass of lumber jack
mass of floating log
velocity of lumber jack =3.74 m/s (w.r.t. shore)
conserving momentum
Initial momentum=Final momentum
(b)For second Log
Conserving Momentum
Initial momentum of log and Lumber jack=Final momentum of log and lumberjack
u is final velocity of lumberjack and log