Answer:
Explanation:
The speed of light is given by
and
hence
Speed of light is given by
A cable is wound around the hub of a spool that has a mass of 50 kg and center of gravity at G, and is connected to a block with
a mass of 30 kg. It is known that the coefficients of static friction are 0.15 under the spool and 0.2 under the block. Compute the maximum counterclockwise moment of a couple Co that can be applied without disturbing the equilibrium of the system
1 answer:
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Answer:
14 m/s
Explanation:
The problem can be solved by using the law of conservation of energy. In fact:
- The mechanical energy of the stone at the top of the cliff is just gravitational potential energy (because the stone is at rest, so its kinetic energy is zero), and it is given by
(1)
where m is the mass of the stone, g=9.8 m/s^2 is the acceleration due to gravity, and h=10 m is the height of the cliff.
- The mechanical energy of the stone when it hits the water is just kinetic energy (because the height of the stone has become zero, so the gravitational potential energy is zero), so it is
(2)
where v is the speed of the stone when it hits the water.
Since the mechanical energy is conserved, we can equalize (1) and (2), and solving for v we find: