Hmm...
dam power plant (not sure if this is considered renewable): benefits: as it creates a tourist spot bringing more money and provides electricity.
disadvantages: restricts flow of water to farms, costs millions to build.
solar power plant: benefits: sunlight just keeps coming, produces a lot of electricity for maybe half the cost.
disadvantages: takes a large crew to maintain, mostly needs to be in an open area.
Wind farm: benefits: wind we don't have to worry about much, just blows through and turns the turbines, and can produce electricity almost 24/7.
disadvantages: unsightly, needs open space and costs a lot to build
Take your pick!
Answer:
As one goes "forward" in time, the second law of thermodynamics says, the entropy of an isolated system can increase, but not decrease. ... Thus, entropy measurement is a way of distinguishing the past from the future.
Explanation:
Potassium undergoes beta (minus) decay to produce an electron and a calcium nucleus.
<u>Answer:</u>
To support the idea that all living things are composed of cells samples of many kinds of living things should be examined under a microscope to identify the presence of cells.
<u>Explanation:</u>
Cell theory states that all living beings are composed of cells. To prove this a thorough examination of a number of living beings under a powerful microscope is needed. Parts of all living things when observed under the microscope are found to be made up of smaller units called cells.
This examination helps to identify differences between plant cells and animal cells. It also gives an idea of the existence of unicellular organisms.
The correct answer to the question is 2.27 
i.e the acceleration of the body is 2.27 along the forward direction.
CALCULATION:
As per the question, the net external force on the propeller of model airplane F = 6.8 N.
The mass of the model air plane m = 3.0 kg
We are asked to calculate the acceleration of the air plane.
From Newton's second law of motion, we know that the net external force acting on a body is equal to the product of mass with acceleration of that body.
Mathematically force F = m × a
⇒ 
[ans]
The direction of acceleration is along the direction of force. Hence, the acceleration of the propeller is 2.27 along forward direction.
