Ascientist has samples of both nitrogen (n2) and hydrogen (h2). both of these substances are odorless, colorless gases at room temperature. the scientist places the samples into a closed flask and heats the flask. a colorless gas that has a strong odor forms. which of these best describes what happened? '
a.
a new element formed when oxygen and nitrogen atoms turned into new kinds of atoms.
b.
a mixture formed when nitrogen and hydrogen combined.
c.
a new compound formed when nitrogen and hydrogen chemically reacted.
d.
a pure substance that is chemically identical to both nitrogen and oxygen formed.

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 answer is option a.