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Liono4ka [1.6K]
3 years ago
7

What happens to a wave when reflected off a node

Physics
1 answer:
Bezzdna [24]3 years ago
7 0

A light wave travelling in air that is reflected by a glass barrier will undergo a 180° phase change, while light travelling in glass will not undergo a phase change if it is reflected by a boundary with air. ... The phase changes that take place upon reflection play an important part in thin film interference.
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That's an example of heat transfer by radiation.
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3 years ago
Which characteristics belong to Whittaker’s classification system? Select two options.
Lana71 [14]

Answer:

Five kingdoms & Seven levels

Explanation:

Robert H. Whittaker proposed five kingdom classical system for living organisms in 1969. These were: Kingdom Monera, Kingdom Protista, Kingdom Fungi, Kingdom Animalia, and Kingdom Plantae. His work was the improvement of earlier work conducted by Carl Linnaeus who proposed three kingdom classification system (Animalia, Plantae, and Protista).

Whittaker's system further categorized each kingdom to seven levels. These were: Kingdom → Phylum  →  Class  →   Order  →   Family →   Genus  →   Species. This categorization was based on similarities in organisms at different levels.

PS: The scientific name of each organism is the combination of genus and family name.

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3 years ago
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Voltage sources are used to sustain
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The movement of electric charge
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3 years ago
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You are riding on a roller coaster that starts from rest at a height of 25.0 m and moves down a frictionless track to a height o
irina [24]

Answer: 20.765 m/s

Explanation:

This problem can be solved by the conservation of energy principle, this means the initial energy E_{o} must be equal to the final energy  E_{f}:

E_{o}=E_{f} (1)

Where each energy is the sum of kinetic energy K and potential energy U:

K_{o}+U_{o}=K_{f}+U_{f} (2)

Where:

K_{o}=\frac{1}{2}mV_{o}^{2}

Being m your mass and V_{o}=0 m/s your initial velocity, since the roller coaster sterted from rest.

U_{o}=mgh_{o}

Being  g=9.8 m/s^{2} the acceleration due gravity and  h_{o}=25 m your initial height

K_{f}=\frac{1}{2}mV_{f}^{2}

Being V_{f} your final velocity

U_{f}=mgh_{f}

Being h_{f}=3 m your final height

Rewritting (2):

\frac{1}{2}mV_{o}^{2}+mgh_{o}=\frac{1}{2}mV_{f}^{2}+mgh_{f} (3)

mgh_{o}=m(\frac{1}{2}V_{f}^{2}+gh_{f}) (4)

Isolating V_{f}:

V_{f}=\sqrt{2g(h_{o}-h_{f})} (5)

V_{f}=\sqrt{2(9.8 m/s^{2})(25 m-3 m)} (6)

Finally:

V_{f}=20.765 m/s This is your spedd when you arrive at 3 m height

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4 years ago
Plate tectonics may affect organic evolution because movement of plates may cause a change in ____.
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Plate tectonics may affect organic evolution because movement of plates may cause a change in the environment


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