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question 1: true

question 2: false

question 3: true

question 4: false

question 5: true

Explanation:

question 1: some of the fertilizers used in the agriculture contains radioactive elements such as uranium, radium and thorium.

question 2: sewage are sent to a municipal wastewater management and treated before disposing it into the lakes,rivers and seas.

question 3: A sewer system is a network of pipelines that collect and transport the sewage and wastewater from houses and commercial buildings to a wastewater treatment plant.

question 4: sewage systems are more likely to be below the road and open drainage systems are build to serve as stormwater runoffs

question 5: the house wastewater contains microscopic bacteria that may be responsible for wastewater diseases such as typhoid, cholera, etc. and the wastewater that is sent out from agricultural fields may contain radioactive elements and other chemicals that are responsible for diseases like chronic kidney disease (CKD)

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

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.