How much power (energy per unit time) can be provided by a 75 m high waterfall with a flow rate of 10,000 l/s? give answer in kw rate given here is volume per unit time; 10,000 l/s mean that every second 10,000 l of water go through the water fall

Explanation:

It is given that flow rate is 10,000 L/s. As 1 L equals 0.001 .

Hence, flow rate will be 10 . Calculate mass of water flowing per second as follows.

        Mass flowing per second = density × flow rate

                                                   =

                                                   =

Also, energy provided per second will be as follows.

                      E = mgh

Putting the given values into the above formula as follows.

                   E = mgh

                      =  

                       =

or,                    = 7350 kW

Thus, we can conclude that energy per unit time provided will be 7350 kW.                

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.