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3 years ago

If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is

2 answers:

3 0

<span>D. 80 degrees.
</span>

The part of the ear where sound wave compressions and rarefactions cause the eardrum to vibrate is the middle ear. The 8th nerve in the inner ear actually converts the mechanical energy to electrical energy for transmitting to the brain. A membrane called the tympanic membrane separates the middle ear from the outer ear. Whenever a sound reaches the ear, it creates a sound wave that creates vibration in the eardrum. The pressure when high pushes the membrane inwards while low pressure sound waves helps the eardrum to come outwards.

icang [17]3 years ago

3 0

The angle of incidence is equal to the angle of reflection. If a wave hits a smooth surface at an angle of incidence of 40 degrees then the angle of reflection is 40 degrees.

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Which force is always directed toward the center of a circle?

vova2212 [387]

The answer is D. centripetal force
This definition of centripetal force is a force acting towards the center of an object moving in a circular motion. Acceleration is the rate of which velocity changes over a period of time. If you pick a point on say a rotating circle and find the tangential velocity at each point it goes through, the acceleration would be towards the middle.

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3 years ago

A textbook of mass 2.10 kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose d

Lilit [14]

Answer:

the tension in the part of the cord attached to the textbook is 7.4989 N

Explanation:

Given the data in the question;

As illustrated in the image below;

first we determine the value of the acceleration,

along vertical direction; we use the second equation of motion;

y = ut + $\frac{1}{2}$ a $_y$ t²

we substitute;

0 m/s for u, 1.29 m for y, 0.850 s for t,

1.29 = 0×0.850 + $\frac{1}{2}$ ×a $_y$ ×(0.850)²

1.29 = 0.36125a $_y$

a $_y$ = 1.29 / 0.36125

a $_y$ = 3.5709 m/s²

Now when the text book is moving with acceleration , the dynamic equation will be;

T₁ = m₁a $_y$

where m₁ is the mass of the text book ( 2.10 kg )

a $_y$ is the vertical acceleration ( 3.5709 m/s² )

so we substitute

T₁ = 2.10 × 3.5709

T₁ = 7.4989 N

Therefore, the tension in the part of the cord attached to the textbook is 7.4989 N

3 0

2 years ago

If a man is standing more than one focal length away from the focal point of a concave mirror, how will his image form in the mi

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If a man is standing more than one focal length away from the focal point of a concave mirror, the image form in the mirror will be "Upside Down." Since the the distance of the man standing is more than one focal length away from the focal point, given that it is a concave mirror, then for sure, the image will be upside down.

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3 years ago

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2 years ago

If He gas has an average kinetic energy of 5930 J/mol under certain conditions, what is the root mean square speed of F2 gas mol

expeople1 [14]

To solve this problem we will apply the concept related to kinetic energy based on the ideal gas constant and temperature. From there and with the given values we will find the temperature of the system. As the temperature is the same it will be possible to apply the root mean square speed formula that is dependent on the element's molar mass, the ideal gas constant and the temperature, this would be:

$KE = \frac{3}{2} RT$