Why do scientists use models? a. models make some things easier to understand. b. measurements can be made only on models. c. models scientists visualize things they can’t see. d. models are perfectly accurate representations of objects. e. scientists can analyze models to make predictions.

Option (c) is the correct answer.

Explanation:

A model is a mode of representation with the help of which we can make things easy to visualize for own self and for others also.

For example, a model of boat structure of glucose will help to visualize how the atoms are bonding together and repelling due to difference in their size.

Hence, scientists also get benefited with the help of models as they also get to know how they need to explain or correct things in their research.

Thus, we can conclude that scientists use models because Models help scientists visualize things they can’t see.

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