Answer:
Gravity is the attraction between two objects that have mass. The amount of gravity is directly proportional to the amount of mass of the objects and inversely proportional to the square of the distance between the objects. Gravity is a force that increases the velocity of falling objects - they accelerate.
Explanation:
Answer:
It would be C because quantity means numbers
To generate clean energy the mayor my build the fooling type of energy plants:
wind farms
solar power plants
wave power plants
Explanation:
At the seaside there are winds all over the year and that can be transformed in electrical energy by a wind turbine. The mayor can build a on-shore wind farm (reduced consts) and may also build off-shore wind farms (but these have an increased cost).
The second option is to build solar power plants. It will be cost effective if the people in the town will install solar panels on the building roofs. In this way you decrease the costs with the transportation of electrical energy.
The third option is to install wave power plants which harvest energy from the sea waves. It is a rather new technology, in comparison with the other two, but the initial consts can be amortized over time.
All three options will provide clean energy.
Right now nuclear plants have a very expensive initial costs and they may not be afforded by small towns.
Learn more about:
clean energy sources
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Answer:
1 / 2
Explanation:
This problem is a 1 - D steady state heat conduction with only one independent variable (x).
1 - D steady state:
Q = dT / Rc
Q = heat flow
dT = change in temperature between a pair of node
Rc = thermal resistance
Rc = L / k*A
Since in both cases Rod A and Rod B have identical boundary conditions:
dT_a = dT_b
So,
R_a = L / k*(pi*r^2)
R_b = 2L / k*(pi*(2r)^2) = L / k*(2*pi*r^2)
Compute Q_a and Q_b:
Q_a = k * dT *(pi * r^2 * / L)
Q_a = k * dT*(2*pi * r^2 * / L)
Ratio of Q_a to Q_b
Q_a / Q_b = [k * dT *(pi * r^2 * / L)] / [k * dT*(2*pi * r^2 * / L)] = 1 / 2
Answer: The energy required to change water from a liquid to a solid is 333.7 kJ/kg while the energy required to boil water is 2257 kJ/kg. The amount of energy needed to change the phase of water to a gas from a liquid is 540 times the amount of energy needed to raise the same amount of water 1° C
Explanation:
