Answer:
a. It creates a pattern of alternating rock stripes on both sides of a mid-ocean ridge.
Explanation:
Seafloor spreading is the theory that the oceanic lithospheric plates are in constant motion just as continental drift occurs.
When oceanic plates collide, the denser subducts under the less dense one, causing a destruction of oceanic lithosphere.
However, during seafloor spreading, a rift in the ocean can spill out some of the partially melted subducted rock. When the magma cools, there is an alternation in the magnetic variation of rocks formed by the series of volcanic action that has occurred underwater.
The variation shows younger rocks closer to the mid-oceanic ridge formed in the process. This variation is measured and compared to confirm that sea floor spreading has actually occurred.
Technically, both B and D are correct when transmitted through solids, but your answer (and the answer I got from taking the test) will be
D) Longitudinal
Hope this helps!
Answer:
the properties they have
Explanation:
I do not think protons have different charges, electrons weigh different, or there are multiple types of neutrons.
<span>Coefficient of static friction needs to be 1.1 or larger.
For this problem, we need to static friction to be at least as large as the centripetal acceleration that the car will experience. So let's get our formulas.
Centripetal acceleration:
F = mv^2/r
where
F = force
m = mass
v = velocity
r = radius of curve
Friction
F = mac
where
F = force
m = mass
a = gravitational acceleration
c = coefficient of friction
Since the frictional force has to be at least as large as the Centripetal force, let's set an inequality between them.
mv^2/r ≤ mac
v^2/r ≤ ac
v^2/(ar) ≤ c
Now let's convert km/h to a more convenient m/s.
104 km/h / 3600 s/h * 1000 m/km = 28.88888889 m/s
Let's substitute the known values into the inequality and calculate.
v^2/(ar) ≤ c
(28.88888889 m/s)^2/(9.8 m/s^2 * 78 m) ≤ c
834.5679012 m^2/s^2 / 764.4 m^2/s^2 ≤ c
1.091794743 ≤ c
Rounded to 2 significant figures gives a required coefficient of static friction of 1.1 or greater. This is a rather large value and indicates that the car is not at all likely to be capable of taking that curve at that speed. There are some things that can be done to mitigate the issue. Those being
1. Reduce the velocity.
2. Increase the normal force. Perhaps by aerodynamic means
3. Bank the curve.</span>