The amount of water needed is 287 kg
Explanation:
The amount of energy that we need to produce with the power plant is

We also know that the power plant is only 30% efficient, so the energy produced in input must be:

The amount of water that is needed to produce this energy can be found using the equation

where:
m is the amount of water
 is the specific heat capacity of water
 is the specific heat capacity of water
 is the increase in temperature
 is the increase in temperature
And solving for m, we find:

Learn more about specific heat capacity:
brainly.com/question/3032746
brainly.com/question/4759369
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According to my assumptions,the answer closest to the perfection is :
c. they show royalty instead of peasants.
        
             
        
        
        
Answer:
Tension T1 is less than tension T2. 
T1 < T2
Explanation:
According to given data,
mass of box A ( mA) is grater than mass of box B (mB)
we can write,
m(A) > m(B)
Newton's second law states that:
Tension of object is directly proportional to the mass of the system.
T ∝ m
here Boxes A and B are being pulled to the right on a frictionless surface,
so Tension T1 generates due to the mass of box A m(A)
and Tension T2 arises due to mass of the system m(A) + m(B)
Thus tension T1 will be less than tension T2
T1 < T2
learn more about Tension force here:
<u>brainly.com/question/13175014</u>
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Observational studies are a prime example. Observational data is more reflective of the real environments that scientists make their inferences to than controlled experiments. The disadvantage of observational studies is that the variability is far greater. <span />
        
             
        
        
        
A magnifying glass is a simple microscope