Answer
let Vt be the total volume of ice berg
V_f be the volume displaced by the ice berg
fraction of visible ice berg
visible fraction = 
= 
we know mass of iceberg is equal to the mass of fluid displaced


now,
= 
a) when ice berg float in the salt water
visible fraction = 
visible fraction = 
visible fraction = 0.10 = 10%
b) when ice berg float in the freshwater
visible fraction = 
visible fraction = 
visible fraction = 0.081 = 8.1%
Answer:
Explanation:
Height of the block before the release "h" = 1.99 kg
mass of the block "m" = 1.5 kg
potential energy of the block = m g h
= 1.5 x 9.8 x 1.99
= 29.253 J
If v be its velocity before striking the floor
kinetic energy of block = 1/2 m v²
Applying conservation of mechanical energy
kinetic energy = potential energy
1/2 m v² = 29.253
.5 x 1.5 x v² = 29.253
v² = 39
v = 6.24 m /s
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The right answer for the question that is being asked and shown above is that: "B) Earth's temperature has not changed over time." Scientists have observed that the average sunspots have increased in the last 50 years. The statement that best describes an effect of this increase in sunspots <span>Earth's temperature has not changed over time. </span>
Answer:
c) wafers of crystalline silicon treated with metals that absorb solar radiation and generate electricity
Explanation:
Photovoltaic solar cells are used in solar panels. Most of the photovoltaic cells are made from crystalline silicon.
It has a property using which it converts the light (solar radiation) falling on it to electrical energy. This process occurs due to the photovoltaic effect.
It is a way generating energy without consuming fossil fuels. Thus it reduces the carbon emission and thus plays a major role in environment protection.