Rhizobium:

are nitrogen-fixing bacteria
live in the nodules of legumes
convert nitrogen in soil into nitrogen compounds
all of the above

All of the above

Explanation:

Rhizobium is an important diazotrophic bacteria in nitrogen cycle. They are involved in a symbiotic relationship with leguminous plants; they assist in nitrogen fixation in the roots of these plant by taking up nitrogen from the atmosphere and passing it into the plants (in the form of ammonia or amino acids) which allows the plant to grow in soil with low nitrogen. The plant in exchange provide organic acids for the bacteria which it uses for carbon and energy source.

From the above, we can deduce that

(a) rhizobium are nitrogen fixing bacteria

(b) they live in the nodules of legumes (hence the symbiotic relationship)

(c) convert nitrogen in soil into nitrogen compounds like ammonia or amino acids

hence, the correct option is all of the above

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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