cj31150631
29.02.2020 •
Physics
Finding the work done in pulling a stranded climber to safety. In an unfortunate accident, a rock climber finds herself stuck 17 m from the top of a 80 m rock face. Rescuers sent to help the climber lower a harness attached to a cable that will pull the climber to the top of the rock face. If the climber, secured in the harness, weighs 56 kg and the cable weighs 0.7kgm, how much work is done in raising the climber, harness, and cable to the top of the rock face? Note: the weight of the climber and cable is really a mass so you will need to multiply the mass in kg by the acceleration due to gravity (approximately 9.8ms2).
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Ответ:
-9446.22 J
Explanation:
Parameters given:
Mass of climber and harness = 56kg
Mass of cable = 0.7kg
Distance between climber and top of rock face = 17m
The work done in pulling the climber is given as:
W = F * d
F is the force applied on the rope. It is opposite the force of gravity pulling the climber, hence, it is given as:
F = -Fg
Fg = force of gravity
Fg = m * g
g = acceleration due to gravity.
The mass of the climber, harness and cable = 56 + 0.7 = 56.7kg
=> Fg = 56.7 * 9.8
Fg = 555.66 N
Therefore, the work done will be:
W = - 555.66 * 17
W = -9446.22 J
The negative value of work means that the work done is opposite the value of the force acting on the climber.
Ответ:
The hollow space of the ship is filled by air. Hence it reduces the average density of the ship to lower than that of water. Therefore, since the density of the ship is less than that of water, it floats in the water. However, a piece of iron sinks because it doesn't has air filled inside it.
2nd Explanation-
The density of iron is more than the density of water therefore the weight of the nail is more than the upthrust experienced by it causing it to sink. However a ship although much larger than the nail floats because the ship is hollow from inside and this space is filled with air which reduces the average density of the ship lower than that of water. Thus even with a small portion of the ship submerged under water, the weight of the water displaced by it becomes equal to the weight of the entire ship.
Explanation:
Hope this helps you. Have a nice day ^_^