Answer:
Semiconductors.
Explanation:
Semiconductors are materials whose electrical conductivities range between that of an insulator and that of a conductor.
Most pure semi-conductors have 4 valence electrons that are usually not available for conduction of electricity (as movement of electrons is what causes the conduction of electricity). In pure semi conductors, it is the holes (spaces supposed to be occupied by electrons) that are usually responsible for the conduction of electricity.
Semi Conductors can undergo a phenomenon called doping and semi conductors' electrical conductivities can be tweaked to go to very extreme highs after doping. Doping is done in two ways, it could entail the addition of impurities that add electrons to the semi conductors (leading to n-type of semi conductors; impurities that lead to this type of semi conductors, include Phosphorus, Arsenic, etc.) or impurities that help remove electrons and increase the number of holes (p-type semi conductor; the impurities that lead to this type of semi conductors, include Boron, Galium etc.). Conductivity can be increased either ways though.
So, conductors can enable and inhibit the flow of electricity.
Answer:
7.5 seconds
Explanation:
because wattsXtime=Joules so 120X__=900. 900 divided by 120= 7.5
You bail out of a helicopter and immediately open your parachute, so your downward velocity satisfies the initial value problem.
<h3>What is
velocity ?</h3>
Velocity is the rate of change in direction of an item in motion as seen from a specific point of view and as measured by a specific unit of time. In kinematics, the area of classical mechanics that studies how bodies move, velocity is a fundamental idea.
A physical vector quantity called velocity requires both magnitude and direction to be defined. Speed, a coherently derived unit whose quantity is measured in the SI (metric system) as metres per second, is the scalar absolute value (magnitude) of velocity. For instance, "5 meters per second" is a scalar while "5 meters per second east" is a vector.
To learn more about velocity from the given link:
brainly.com/question/80295?source=archive
#SPJ4
Plants provide food and Carbon dioxide
Answer:
Explanation:
Look at the equation for Potential Energy. PE = mass times gravity times the height. Filling in and solving for h:
34.3 = .5(9.8)h so
34.3 = 4.9h so
h = 7 meters
