Answer:
The correct option is D
Junction diodes are preferred over point-contact diodes for most purposes.
Explanation:
Point contact diode:
This type of diode is constructed by touching a metallic wire with an N-type semiconductor to form a small area of contact, hence the name point contact diode. The switching speed of these diodes is better than a conventional diodes.
These diodes are not usually preferred due to their low current ratings and poor reliability.
P-N junction diode:
This type of diode is constructed by joining two regions of opposite conductivity N-type and P-type material, a PN-junction is formed which allows the current to flow in one direction only. The conversion of AC current to DC is done by this process called rectification.
Answer:
The answer is: measuring instrument
Explanation:
The researcher develops test to measure the variables she is interested in. So, they are her measuring instrument.
The force of friction is 399.7 N
Explanation:
The force of friction acting on the bear is given by
(1)
where
is the coefficient of friction
N is the normal reaction exerted by the plane on the bear
The normal reaction can be found by analyzing the forces acting in the direction perpendicular to the plane: in fact, the bear is in equilibrium along this direction, so the normal reaction must balance the component of the weight perpendicular to the plane:
![N=mg cos \theta](https://tex.z-dn.net/?f=N%3Dmg%20cos%20%5Ctheta)
where:
m = 900 kg is the mass of the bear
is the acceleration of gravity
is the angle of the incline
Substituting everything into (1), we find the force of friction:
![F=(0.05)(900)(9.8)(cos 25)=399.7 N](https://tex.z-dn.net/?f=F%3D%280.05%29%28900%29%289.8%29%28cos%2025%29%3D399.7%20N)
Learn more about inclined plane and frictional force here:
brainly.com/question/5884009
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