Green is reflected off of most plant leaves.
Answer:
D. Test a piece of treated iron and a piece of untreated iron under the same conditions.
Explanation:
A controlled experiment is defined as an experiment where the experimenter or the researcher tries to test or experiment his result by changing one variable at a time and keeping the other factors under the same conditions and sees how it effects the result.
The factors which can be changed in an experiment is called its variables.
In the context, testing a piece of treated iron as well as a untreated piece of iron under the same working conditions forms a controlled experiment.
Answer:
1. Work Is a type of Physical Activity
2. Power is Basically Having control of Society
Explanation:
Answer: a. Regularly, you rub your hands for warmth.
b. Some examples are friction from electricity going through a wire or friction from rubbing your hand together.
c. Without friction, we would fall every time we walked. Because there is friction, we can walk normally. Another example is a ball moving across the field. Without friction, the ball would not slow down.
Explanation:
Overall, friction is important to us because we depend on it.
Hypothesis
Let there is no air drag or any other resistance force due to surrounding
Now the force equation of ball is given as
so the ball will be dropped down by acceleration a = g and this acceleration is independent of size and mass of the ball
So in this case both balls will be dropped by same acceleration.
So here both balls will hit the ground at same time
