The answer is D obviously as that is unnecessary for the Earth
Answer:
nuclear fusion plants are fossil fuels, if you are asking which of the following is a fossil fuel
Explanation:
Answer:
At the top of the hill.
Explanation:
As the roller coaster goes up the hill, kinetic energy (K.E) decreases, gravitational potential energy (G.P.E) increases .
As it reach the top of the hill, K.E becomes zero and G.P.E reaches <em>m</em><em>a</em><em>x</em><em>i</em><em>m</em><em>u</em><em>m</em> .
As it goes down the hill, K.E starts to increase and G.P.E decrease .
At the bottom of the hill, K.E reaches <em>maximum</em> and G.P.E becomes zero .
(Correct me it I am wrong)
A) 17.9 cm
We have:
is the focal length of the mirror (for concave mirror, the focal length is positive)
is the distance between the object and the mirror
is the distance between the image and the mirror
We can then use the mirror equation to find q:
B) -5.0 cm
The height of the image can be determined by using the magnification equation:
where
is the heigth of the image
is the height of the object
Substituting and re-arranging the formula, we find
And the negative sign means the image is inverted.
Answer:
a. ≈ 1.22449s
b. ≈ 14.69387m
c. ≈ 0.532415s
Explanation:
Because we are trying to find when it is at it's highest point we can safely say that it's velocity at that point is 0m/s,
therefore we can use the equation:
and do some algebra to get:
Now we plug in our values (note that this is assumed to be on Earth and that because it says that upwards is positive, we set g to be negative to say that it is pointing down):
To find the final height we can use:
and plug in our values to get:
To find the time we can use the time dependent position equation:
This here can be made into a quadratic equation like so (xi is set up to be 0m, so the equation wont have it):
Here we can use the quadratic formula:
And now it would be best if we put in our values (xf = 5m because that is our question):
Finally we have simplified enough to be worth solving for:
We get:
and
Because time is always positive we want to choose the plus answer.