All of the following are possible source of error in a scientific investigation except for? a)discovering new variables as the experiment proceeds b)not controlling all the variables in a experiment c)adding research resources during an investigation d)measuring the materials of an experiment incorrectly

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented.b)scientists had not completely finalized their results, which took 30 years.c)cigarettes were cheaply available and media channels were very inefficient.d)cigarette manufacturers were trying hard to bring an alternative into the market

Phase changes are chemical changes. true or false

Acrow drops a 0.11kg clam onto a rocky beach from a height of 9.8m. what is the kinetic energy of the clam when it is 5.0m above the ground? what is its speed at that point?