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sergeinik [125]
3 years ago
7

Calculate the angle of incidence of light ray incident on surface

Physics
1 answer:
Katena32 [7]3 years ago
3 0

Answer:

from \: snell {}^{.} s \: law : \\  n =  \frac{ \sin(i) }{ \sin(r) }  \\  \sqrt{3}  =  \frac{ \sin(i) }{ \sin(30 \degree) }  \\  \sin(i)  =  \sqrt{3}  \times  \sin(30 \degree)  \\  \sin(i)  = 0.866 \\ i =  { \sin}^{ -1 } (0.866) \\ i = 60 \degree

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The efficiency of a screw is low because of _____.
AfilCa [17]
The correct answer that would best complete the given statement above would be the second option. A screw is an inclined plane wrapped around a cylinder. <span>The efficiency of a screw is low because there is more input than output. In other words, it is because of friction. Hope this answer helps.</span>
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3 years ago
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Dalton’s completing an investigation in the science lab. He observes that a sample of liquid turns to gas at 135°C. What’s this
artcher [175]

The temperature at which the sample of liquid turns to gas at 135 °C is termed as boiling point.

Answer: Option A

<u>Explanation: </u>

The observation of conversion of liquid to gas indicates that there is occurrence of change in the state of matter. The inter-conversion from one state to another can be done by either varying the temperature or by varying the pressure.

In this case, the liquid on heating gets converted to gaseous state after attaining a particular temperature say 135 °C. So, this process of conversion from liquid to gaseous state on heating is termed as boiling.

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3 years ago
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What is the magnitude of the angular momentum (in kgm2/s) of a 40 g golf ball flying through the air and spinning at 4300 rpm af
sladkih [1.3K]

Answer:

L=0.0045\ kg-m^2/s

Explanation:

Given that,

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Its angular velocity, \omega=4300\ rpm=450.29\ rad/s

The radius of the sphere is 2.5 cm or 0.025 m

We need to find the magnitude of the angular momentum of the ball. It is given by the formula as follows:

L=I\omega

Where I is moment of inertia

For sphere, I=\dfrac{2}{5}mr^2

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4 0
2 years ago
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sammy [17]

Answer:

15.7 m

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v = final speed of sled = 0 m/s

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d = stopping distance for the sled

Using work-change in kinetic energy theorem

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d = 15.7 m

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3 years ago
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