Two balls are dropped at the same time from the top of a ladder. the balls are of equal size, but ball a has more mass than ball b. which of the following best describes the time it would take the two balls to hit the ground?
(note: ignore the effects of friction.)
a.
ball a and ball b would hit the ground at the same time.
b.
ball b would hit the ground before ball a.
c.
there is not enough information given to answer the question.
d.
ball a would hit the ground before ball b.

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

The coulomb's law explains which of the following? select all the force between two charged objects is inversely proportional to the charge on each object. the force between two charged objects is directly proportional to the charge on each object. the force between two charged objects is directly proportional to the distance separating them. the force between two charged objects is inversely proportional to the square of the distance separat coulomb's law is similar to newton's 2nd law. if the force between two objects is f and the charge on both objects is doubled, the new force between the would now be 2f. if the force between two objects is 2f and the distance separating them is doubled, the new force between the objects would now o the be zf.