1. A television set falls from rest from a bridge 100m above the river surface.
1 answer:
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Answer:
1.85 m/s
102.438 m
Explanation:
From vector motion
The resultant velocity
The magnitude of speed of the speed of the boat relative to a stationary shore observer is 1.85 m/s
The distance covered is 229 m
Time = Distance / Speed
Distance = Speed of current × Time
Distance = 0.756×135.5 = 102.438 m
The boat will be 102.438 m from the initial position is the boat when it reaches the opposite shore
When the iron and the water reach thermal equilibrium, they have same temperature, 
.
We can consider this as an isolated system, so the heat released by the water is equal to the heat absorbed by the iron.
The hear released by the water is:
where
is the water mass, 
is the specific heat of the water, and 
is the variation of temperature of the water.
Similarly, the heat absorbed by the iron is:
where
is the iron mass, 
is the iron specific heat, and 
is the variation of temperature of the iron.
Writing
and replacing the numbers, we can solve to find mw, the mass of the water:
We can consider this as an isolated system, so the heat released by the water is equal to the heat absorbed by the iron.
The hear released by the water is:
where
Similarly, the heat absorbed by the iron is:
where
Writing