Mendeleev spent a great deal of time in laboratories as a student, studying the burgeoning new field of

Mendeleev spent a great deal of time in laboratories as a student, studying the burgeoning new field of CHEMISTRY.

Explanation:

Dmitri Mendeleev was a 'Russian chemist' and  also an inventor. He is known for formulating periodic law. He is also remembered for creating a version of periodic table consisting of  elements. He not only corrected the hypothesised properties of already discovered elements using a periodic table rather gave a prediction of properties of eight elements  are yet to be identified.  

The original draft about the discovery of the periodic table was published as "Tentative System of Elements". He is also known as remembered the "Father of  periodic table".  

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.