Help me please I only have a few minutes to get this doneplease and thank q

I'm stuck on question 3. Could anyone please explain it?

sergiy2304 [10]

Peak voltage is 2
period is 40ms
frequency = 1/period = 25Hz

5 0

3 years ago

"The drawing shows three layers of different materials, with air above and below the layers. The interfaces between the layers a

My name is Ann [436]

Answer:

Angle of incidence that entered material b= 63.1°

Angle of incidence between a and b = 55.9°

Explanation: Using the formular:

n1sintheta1= n2sintheta2

The light ray which enters material B will be

1.4Sin72.8° = 1.5Sin theta

1.3373= 1.5Sintheta

sintheta = 1.3373/1.5

Sin^-1 0.8916 = Theta

63.1 = theta

When the ray hits interface with material a

1.5Sin63.1 = 1.3 Sin theta

1.3374 = 1.3Sin theta

Sintheta= 1.3374/1.3

Sin theta = 1.0877

There will be total reflection off the boundary b c because sin theta exceeded 1 in value.

The equation should be

1.4sin63.1 = 1.4 sin theta

Sin theta=72.8°

When the ray hits air-c boundary:

1.4sin72.8=1.00sin theta

Sin theta=1.3374/1 =1.3374

There is total reflection.

In material a,the ray will:

1.3sin72.8° = 1.00sin theta

There will be total reflection when the ray hits a-b boundary.

1.3sin72.8= 1.5sintheta

Sin theta= 1.2419/ 1.5

Sin theta =0.8279

Theta= Sin^-10.8279= 55.88°

When ray hits c-air boundary

1.4sin63.1= 1.00sintheta

1.2485= sin theta = Toal reflection.

Therefore when the ray of light pass through the layers of material a, b and c the boundary with air on top and bottom will be total reflection.

7 0

4 years ago

When in orbit, a satellite such as the space shuttle is

My name is Ann [436]

When in orbit, a satellite such as the space shuttle s in non-accelerated motion.

8 0

3 years ago

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A golfer hits a ball at an angle of 12 degrees above horizontal. The velocity of the ball is 37 m/s. What is the horizontal dist

ruslelena [56]

72 m is the horizontal distance the travels.

Option: C

Explanation:

The units to express the horizontal and vertical distances are meters (m). The "horizontal" and "vertical" velocities are expressed in "meters per second" (m/s).

Horizontal distance = (initial horizontal velocity)(time)

We can now get the range x from the horizontal component of velocity

$x=v_{x o} \times t$ equation (1)

$\mathrm{v}_{\mathrm{xo}}=\text { initial horizontal velocity }(\mathrm{m} / \mathrm{s})$

x = horizontal distance (m)

t = time (s)

$\mathrm{v}_{\mathrm{x} \mathrm{o}}=\mathrm{v} \cos \theta$

We know that, V = 37 m/s, θ = 12 degree and t = 2 seconds.

To find, $\mathrm{v}_{\mathrm{x} \mathrm{o}}=\mathrm{v} \cos \theta$

$\mathrm{V}_{\mathrm{x} \mathrm{o}}=37 \times \cos 12$

$\mathrm{V}_{\mathrm{x} \mathrm{o}}=37 \times 0.974$

$\mathrm{V}_{\mathrm{x} \mathrm{o}}=36.038$

$\mathrm{Now}, \mathrm{x}=\mathrm{v}_{\mathrm{xot}}$

$x=36.038 \times 2$

x = 72.076 m ~ 72 m

x = 72 m

The horizontal distance is 72 m.

5 0

3 years ago

What are the two forces that keep a pendulum swinging?

Nezavi [6.7K]

The force of gravity is the only force that keeps a pendulum in motion. both the force increases the speed of the pendulum on the downswing and decreases it's speed on its upswing.

3 0

3 years ago

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