Answer:
Explanation:
The faster particles move, the more kinetic energy they have. Within a given substance, such as water, particles in the solid state have the least amount of kinetic energy. This is because they only vibrate in place. Particles in the liquid state move faster than particles in the solid state.
Answer:
C. over land in polar regions.
Work done in horizontal direction = 0 as the potential energy is not changed and the change in kinetic energies : initial and final - is zero.
work done when the person carries the suitcase in vertical direction =
= m g h = change in potential energy = 30 kg * 9.8 m/sec/sec * 10 m
= 2940 Joules
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There is a force F1 lifting the body upwards. There is Weight W = m g pulling the body downwards. The net force F2 on the body is upwards with acceleration a.
F2 = m a = F1 - W = F1 - m g
a = F1 / m - g
Work done by Force F1 with which the object is lifted = F1 . s = 230 Joules
F1 = energy spent / distance = 230 J / 2 m = 115 Newtons
Net Acceleration of the body = a = F1 / m - g = 115/10 - 10 = 1.5 m/sec/sec
==========================
m = 2 kg F = 8 Newtons t = 12 sec
a = F/m = 4 m/sec/sec
v = u + a t = 0 + 4 * 12 = 48 m/sec
kinetic energy = 1/2 m v² = 1/2 * 2 * 48 * 48 = 48² Joules
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Answer: -4.4 m/s
Explanation:
This problem can be solved by the Conservation of Momentum principle, which establishes that the initial momentum 
must be equal to the final momentum 
:
(1)
Where:
(2)
(3)
is the mass of the child
is the initial velocity of the child
is the mass of the adult
is the initial velocity of the adult (it is sitting still)
is the final velocity of the child
is the final velocity of the adult
Substituting (2) and (3) in (1):
(4)
Isolating :
(5)
(6)
Finally:
This means the velocity of the child is in the opposite direction
Answer:
Given,
mass of man = 100 N = 10 kg
height = h = 25m
since the man does not move anything with his force, work done by him is zero
work done on the man = gain in potential energy
P.E=mgh
P.E=10×9.8×25
P.E=2.45KJ
Explanation:
so, potential energy gained by man is 2.45 KJ
