What does the term, nuclear waste (from a nuclear facility), refer to?
a) material that still contains radioactive particles and atoms
b) unused chemical energy in fissionable reactants
c) green radioactive slime stored in barrels
d) non-radioactive material left over from the production, assembly, and use of nuclear reactors

d) non-radioactive material left over from the production, assembly, and use of nuclear reactors

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

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )