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2 years ago

When does total internal reflection occur?

Physics

1 answer:

gogolik [260]2 years ago

3 0

Answer:

Explanation:

I believe it is A because reflection is usually like a mirror or in water the other ones described are refraction or conversion. Hope this helps! :)

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The angular velocity of the disk is defined by ω = ( 5 t 2 + 2 ) r a d / s , where t is in seconds. Determine the magnitudes of

ohaa [14]

Answer

given,

Assume radius of the disk be = 0.8 m

angular velocity of disk

ω = ( 5 t² + 2 ) r a d / s

magnitude of velocity and acceleration = ?

At the instant of time, t = 0.5 s

ω = ( 5 x (0.5)² + 2 ) r a d / s

ω = 3.25 r a d / s

$\alpha = \dfrac{d\omega}{dt}$

$\alpha = \dfrac{d}{dt}( 5 t² + 2)$

$\alpha =10 t$

$\alpha =10\times 0.5$

α = 5 rad/s²

velocity

v = ω r

v = 3.25 x 0.8

v = 2.6 m/s

tangential acceleration

$a_t = \alpha r$

$a_t =5 \times 0.8$

$a_t =4\ m/s^2$

normal acceleration

$a_n = \omega^2\ r$

$a_n = 3.25^2\times 0.8$

$a_n =8.45 \m/s^2$

$a = \sqrt{a_n^2 + a_t^2}$

magnitude of the acceleration

$a = \sqrt{8.45^2 + 4^2}$

a = 9.35 m/s²

6 0

3 years ago

The air pressure inside the tube of a car tire is 430 kPa at a temperature of 13.0 °C. What is the pressure of the air, if the t

KengaRu [80]

Answer:

The pressure of the air is 499.91 kPa.

Explanation:

Given that,

Initial pressure = 430 kPa

Temperature = 13.0+273=286 K

Final temperature = 59.5+273=332.5 K

We need to calculate the final pressure

Using relation of pressure and temperature

At constant volume,

$\dfrac{P'}{P}=\dfrac{T'}{T}$

$\dfrac{P'}{430}=\dfrac{332.5}{286}$

$P'=\dfrac{332.5}{286}\times430$

$P'=499.91\ kPa$

Hence,The pressure of the air is 499.91 kPa.

7 0

2 years ago

Explain how a thumbtack is designed so that you do not have to use a lot of force to push it through paper or the surface of a b

Brums [2.3K]

Thumbtacks have a flat top which gives you a bigger area to push on, and the end is tapered and sharp to make it easier to push it into a wall, etc.

8 0

2 years ago

Deer ticks can carry both Lyme disease and human granulocytic ehrlichiosis (HGE). In a study of ticks in the Midwest, it was fou

tiny-mole [99]

Answer:

a)0.024

b)0.148

Explanation:

Let 's represent the set of deer ticks Carrying Lyme disease with L and the set of deer ticks carrying Human Granulocytic Ehrlichiosis with H

Given:

P(L) = 0.16

P(H) = 0.10

P(L n H) = 0.1 ·P( L u H )

Hence, P( L u H) = 10 ·P( L nH)

(a)

Hence. using the equation. P(L U H) = P(L) + P(H) - P(L n H)

Hence, 10 · P(L n H ) = 0.16 + 0.1 - P(L n H )

Hence, 11 · P(L n H) = 0.16 + 0.1 = 0.26

Hence, P(L n H) = 0.26/11=0.024

(b)

We know that condition probability P(H ║ L) = p(L n H)/P(L)

hence, P(H ║ L) =(0.26/11)/0.16 =0.148

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2 years ago

5. On the periodic table, which families are in the first period?<br> a

kkurt [141]

Answer:

The family in the first period is the alkali metal family.

5 0

2 years ago

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