Due in 30 minutes joseph obtains 12.0 g of sodium chloride (table salt) and 85.0 g of water in separate beakers. he masses both substances; his data is shown in the table below. mass of beaker with sodium chloride 37.8 grams mass of beaker with water 127.9 grams joseph carefully pours all of the sodium chloride into the water and stirs gently until all of the sodium chloride has disappeared. joseph then places the beaker containing the water and sodium chloride on the balance. c. predict the mass shown on the balance. d. draw particle pictures for before and after joseph’s experiment.

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