answer for number nine is C
Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust.
Divergent boundaries – where two plates are moving apart. ...
Transform boundaries – where plates slide passed each other.
answer for number eight is d.
hope this help you
Answer:
Explanation:
Given
Velocity of bat
Frequency of sound
velocity of sound
using Doppler Effect apparent frequency is given by
where
apparent frequency
v=velocity of sound in the given media
velocity of source
velocity of observer
here velocity of source is zero
as source is travelling towards source thus
Answer:
The frequency of the second wave is half of the frequency of first one.
Explanation:
The wavelength of the second wave is double is the first wave.
As we know that the frequency is inversely proportional to the wavelength of the velocity is same.
velocity = frequency x wavelength
So, the ratio of frequency of second wave to the first wave is
The frequency of the second wave is half of the frequency of first one.
This an example of the law of Conservation of Energy.
The car has quite a bit of kinetic energy while it's rolling. If you want to stop it, you have to take that kinetic energy away from the car, AND you have to do something with that energy.
If it's an electric car or hybrid, you can turn the kinetic energy into electrical energy, put it back into the batteries, and use it again later.
If it's just an ordinary gas guzzler, there's no way to save the kinetic energy. You use the car's kinetic energy to scrape two rough surfaces together, that turns it into heat, and the air blows the heat away.
Next time you want the car to roll again, you have to make more, new, kinetic energy. So you take chemical energy out of more gas, and you use the motor to turn the chemical energy into kinetic energy.
It's all the law of Conservation of Energy ... in action.