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mr Goodwill [35]
3 years ago
9

Help ASAP! Giving brainliest!!!

Physics
2 answers:
PilotLPTM [1.2K]3 years ago
8 0
<h3><u>Answer and explanation;</u></h3>

Reflection;

  • Bounces back from an opaque material
  • Bounces back from the boundary of two mediums
  • Seen in mirrors

Refraction;

  • Passes through a prism  
  • Moves from one medium to another  
  • Seen in lenses

Reflection refers to the bouncing of waves such as light waves. It involves a change in direction of waves when they bounce off a barrier.

Refraction is the bending of waves when they move from one medium to another. It involves a change in the direction of waves as they pass from one medium to another.

amid [387]3 years ago
3 0

Answer:

Reflection

- Seen in mirrors

- Passes through a prism

- Bounces back from the boundary of two mediums

Refraction

- Bounces back from a opaque material

- Moves from one medium to another

- Seen in lenses  

Explanation:

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When enough ____ is added to the substance, the solid reaches its ____ point and becomes a liquid
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Answer:  When enough __energy__ is added to the substance, the solid reaches its _melting_ point and becomes a liquid

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Amy is standing still on the ground; Bill is riding his bicycle at 5 m/s eastward; and Carlos is driving his car at 15 m/s westw
Solnce55 [7]

Answer:

20 m/s westward

Explanation:

Taking eastward as positive direction, we have:

v_B = +5 m/s is the velocity of Bill with respect to Amy (which is stationary)

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Bill is moving 5 m/s eastward compared to Amy at rest, so the velocity of Bill's reference frame is

v_B = +5 m/s

Therefore, Carlos velocity in Bill's reference frame will be

v_C' = v_C - v_B = -15 m/s - (+5 m/s) = -20 m/s

and the direction will be westward (negative sign).

3 0
3 years ago
Which of the following is NOT an indicator of a physical change?
S_A_V [24]

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A distant large asteroid is detected that might pose a threat to Earth. If it were to continue moving in a straight line at cons
Vlada [557]

Answer:

The minimum speed required is 5.7395km/s.

Explanation:

To escape earth, the kinetic energy of the asteroid must be greater or equal to its gravitational potential energy:

K.E\geq P.E

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\dfrac{1}{2}mv^2 \geq  G\dfrac{Mm}{R}

where m is the mass of the asteroid, R= 24,000,000\:m is its distance form earth's center, M = 5.9*10^{24}kg is the mass of the earth, and G = 6.7*10^{-11}m^3/kg\: s^2 is the gravitational constant.

Solving for v we get:

v \geq \sqrt{\dfrac{2GM}{R} }

putting in numerical values gives

v \geq \sqrt{\dfrac{2(6.7*10^{-11})(5.9*10^{24})}{(24,000,000)} }

\boxed{v\geq 5739.5m/s}

in kilometers this is

v\geq5.7395m/s.

Hence, the minimum speed required is 5.7395km/s.

5 0
3 years ago
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