Actually, two of the statements can be argued to be true:
1)Changing several different factors in an experiment takes too many controls.
This means that for every factor that is changed you need a control which has all the other factors stable - but with many factors, this might be undoable.
2) - and this is the best answer:
When only one factor is changed, you can be more certain that it caused the results.
If this factor is the only thing that changes, you can safely assume that it caused the results!
Answer:
the government's use and control of science. To clarify, I live in the U.S. I'm only interested in how the U.S. government dictates science. If you have any information or links that could educate me on this topic, I would be appreciative.
Explanation:
<span>The distance "d" you bike varies directly with the amount of time "t" you bike. Therefore,
d </span>α t
To turn it into equality, we introduce k, proportionality constant.
d = kt
We find the value of k from the given conditions. <span>Suppose you bike 13.2 miles in 1.25 hours.
13.2 = k(1.25)
k = 10.8 miles/our
Therefore the equation would be:
d = 10.8t
It is a linear graph with slope 10.8 and it passes at the origin.</span>
Answer:
F = M a is Newton"s Second Law
W = M g is the weight of the mass (W = 2 kg * 10 m/s) = 20 Newtons
g provides a downward acceleration of 10 m/s^2
F = M a = (12 - 10) m/s^2 * 2 kg = 4 kg m/s^2
The example that you gave shows both accelerations in the same direction which is not correct. your example would show the reading on a scale, if the person was on a scale - 10 m/s^2 + 2 m/s^2 = 12 m/s^2 which is offset by the person's weight of 10 m/s^2 in the other direction.
Draw a diagram showing the forces acting on mass M and the resulting acceleration a.