It’s the velocity to the trex then divided by pie to get 8.3
The property that describes an electromagnetic wave and not a mechanical wave is travels in a a vacuum. That will make the correct answer B. I hope that helps you.
Answer:
The real risk-free rate is 2.1%
Explanation:
Typically, the return on investment is denoted by the below formula:
return on investment=real risk-free rate+inflation premium+default risk premium+liquidity premium+maturity premium
return on investment is 4.4%
inflation premium is 1.9%
maturity risk premium is 0.4%
liquidity premium is 0%
default risk is also assumed to zero as the treasury bond is backed by the government whose level of default is zero
real risk-free rate=return on investment-inflation premium-default risk-liquidity premium-maturity premium
real risk-free rate=4.4%-1.9%-0%-0%-0.4%
real risk-free rate=2.1%
Answer:
21.30 m2
Explanation:
First of all, we calculate the energy necessary to increase the temperature of the water from 20°C to 49°C. We use the specific heat in order to achieve this:
Where m_w is the mass of water, sh is the specific heat.
The mass of the water can be found using the volume of water and density:
Then:
You want to heat the water in 2.6h, this means, you will need to supply a power equal to the total amount of energy required divided by the time in seconds. In 2.6h there are 2.6*3600 = 9360s:
But remember, you have an efficiency of 28%, so the actual amount of power that you need to recieve from the sun is equal to:
Now, for the power of a collector is:
Where Psun is the power of the sun, S is the intensity of incident sunlight and A is the area. Solving for Area: