Which of these is an example of a hypothesis? (2 points)

a. adults were not interviewed

b. the investigation was time consuming

c. the source of information was biased

d. very few teenagers were interviewed

scientists in different parts of the world have conducted experiments to find the speed of light in vacuum. if the results of the experiments are identical, they would most likely be (2 points)

a. valid

b. biased

c. unreliable

d. non-observable

which of these questions can be answered using science? (2 points)

a. what is the best career?

b. does water exist on venus?

c. should the use of automobiles be stopped?

d. which is the most interesting subject to study?

the models can be best used to (2 points)

recreate something which is easily observed in nature

prove that all atomic theories have the same meaning

demonstrate the transformation of atomic theory into law

represent the locations of subatomic particles in different atomic theories

22.

(bws.06)

scientists earlier believed that the lowest measurable temperature is the freezing point of ice. however, modern scientists believe that temperatures below the freezing point of ice can also exist. what best accounts for these different opinions? (2 points)

scientists propose contradictory ideas to include all possibilities

scientists come up with different hypotheses without enough evidence

scientists propose different ideas to avoid repetition of scientific knowledge

scientists having different interests may interpret the same data in different ways

based on the graph, what is the most likely mass of an apple chosen randomly from the basket? (2 points)

between 0.10 kg and 0.12 kg

between 0.12 kg and 0.14 kg

between 0.14 kg and 0.16 kg

between 0.16 kg and 0.18 kg

a scientist studies a model of a widely accepted theory about the position of planets and sun. the model would most likely the scientist to (2 points)

prove that the theory would not change in the future

demonstrate how the theory can be changed into a law

understand facts which cannot be easily observed

prove that all other facts about the universe are incorrect

one scientist discovered a new theory on the evolution of the universe. what is the next step for the scientist to take? (2 points)

transform the results of the theory into universal laws of nature

inform the scientific community so they can verify the results

call a press conference to make the discovery popular among people

encourage scientists worldwide to find an appropriate application for the results

the students' observations are listed below.

when an iron nail is taken near the north pole (n) of the bar magnet, it is pulled towards the magnet.
when an iron nail is taken near the south pole (s) of the bar magnet, it is pulled towards the magnet.
the experiment was repeated by several students using different bar magnets. based on the investigations, which of these theories would the students most likely propose? (2 points)

magnets attract iron nails

the poles of a magnet attract all materials

iron nails are attracted towards all materials

iron nails have the same properties as magnets