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Mnenie [13.5K]
3 years ago
5

A diver shines a flashlight upward from beneath the water (n=1.33) at a 36.2° angle to the vertical. At what angle does the ligh

t leave the water? Express your answer using three significant figures?
Physics
1 answer:
horrorfan [7]3 years ago
7 0

Answer:

The flashlight leaves the water at an angle of 51.77°.

Explanation:

if n1 = 1.33 is the refractive index of water and ∅1 is the angle at which the flashlight shine beneath the water, and n2 = 1.0 is the refractive index of air and ∅2 is the angle the flashlight leaves the water.

Then, according to Snell's law :

n1×sin(∅1) = n2×sin(∅2)

sin(∅2) = n1×sin(∅1)/n2

           = (1.33)×sin(36.2)/(1.0)

           = 0.7855055×379

     ∅2 = 51.77°

Therefore, the flashlight leaves the water at an angle of 51.77°.

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An MRI technician moves his hand from a region of very low magnetic field strength into an MRI scanner's 2.00 T field with his f
makkiz [27]

Answer:

2.62 A

Explanation:

B = 2 T, Diameter = 2.5 cm , radius, r = 0.0125 m, t = 0.45 s, r = 0.01 ohm

Induced emf, e = rate of change of magnetic flux

e = A x dB / dt = 3.14 x (0.0125)^2 x 2 / 0.45

e = 0.026 V

induced current, i = e / R = 0.026 / 0.01 = 2.62 A

7 0
3 years ago
A major league baseball pitcher throws a pitch that follows these parametric equations: x(t) = 142t y(t) = –16t2 + 5t + 5. The t
azamat

Answer:

(a) x'(t)= 142

(b) 142

(c) y'(t)= -32t+5

(d) 96.8 mph

(e) 0.426 s

(f) 0.061 rad

Explanation:

Velocity is a time-derivative of position.

(a) x(t) = 142t

x'(t)= 142

(b) Since x'(t)= 142 is independent of t, it follows it was constant throughout. Hence, at any point or time, the horizontal velocity is 142.

(c) y(t) = - 16t^2+5t+5

y'(t)= -32t+5

(d) When it passes the home plate, the ball has travelled 60.5 ft (from the question). This is horizontal, so it is equivalent to x(t).

x(t)= 142t = 60.5

t=\dfrac{60.5}{142}= 0.426.

In this time, the vertical velocity, y'(t) is

y(t)= -32\times0.426+5 = -8.632

The speed of the ball at thus point is s=\sqrt{142^2+(-8.632)^2}=142 ft/s

To convert this to mph, we multiply the factor 3600/5280

s=142\times\dfrac{3600}{5280}=96.8 \text{ mph}

(e) The time has been determined from (d) above.

t= 0.426

(f) This angle is given by

\theta=\tan^{-1}\dfrac{y'(t)}{x'(t)}

\theta=\tan^{-1}\dfrac{-8.632}{142}=\tan^{-1}-0.0607=3.47 (Note here we are considering the acute angle so we ignore the negative sign)

In radians, this is

\theta=3.47\times\dfrac{\pi}{180}=0.061 \text{ rad}

6 0
4 years ago
Can someone help me with this really quick please
AlekseyPX

Apple juice is a homogeneous mixture. That means when you look through it, you can't see anything but  a liquid with your naked eye. The color is constant. Then how do you know there is something else in there? The color gives you the hint you need. Pure water is colorless in liquid form.

The salad dressing might be a solution and it can be made to temporarily mix when you shake it, but it will soon separate into oil and a water based acid usually vinegar.

Filtering wouldn't affect the apple juice. Whatever is in there will go through filter paper. It's like using a screen with 1 inch squares: only the largest stones would be filtered out.

Filtering might take out some of the particles in the oil / acid mixture but likely on the herbs put in. I'm not sure you should say no effect on either really.

8 0
4 years ago
A bag of blood with a density of 1050 kg/m3 is raised about 1.00 m higher than the level of a patient's arm. How much greater is
SSSSS [86.1K]

Answer:

A bag of blood with a density of 1050 kg/m4 is raised about 1.00 m higher than the level of a patient's arm. How much greater is the blood pressure at the patient's arm than it would be if the bag were at the same height as the army is the solisan of kind

8 0
3 years ago
Acceleration directed toward the center of a circular path that produces uniform circular motion is
tester [92]
<span>Th answer is Centripetal</span>
4 0
4 years ago
Read 2 more answers
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