1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sever21 [200]
3 years ago
6

A fisherman in a stream 39 cm deep looks downward into the water and sees a rock on the stream bed. How deep does the stream app

ear to the fisherman
Physics
1 answer:
Diano4ka-milaya [45]3 years ago
6 0

Answer:

30cm

Explanation:

assume that the eyes are substantially above the water so that sin(theta) is approximately theta.

( small angle approximation).

The point at which a ray leaving the fish hits the surface of the water is x to the side of the centreline and the depth of the water is d

x/d = sin( angle of incidence)

if the apparent depth of the water is h then

x/h = sin( angle of refraction)

and applying snells law

1 sin ( theta air) = 1.33 sin( theta water)

1 * x/h = 1.33 * x/d

d/h = 1.33

or h/d = 1/1.33

h/39 = 1.33

h = 39 /1.33 so that is the apparent depth of the stream assuming:-

1. Your eyes are almost directly overhead

and

2. your eyes are a significant distance above the surface of the water.

x/d = 1.33 x/h

h/d =39/1.3

= 30cm

You might be interested in
Which of the following has the fewest calence electrons?
dlinn [17]

Answer:

both magnesium and strontium have 2 valence electrons

Explanation:

potassium has 8 valence electrons, and nitrogen has 5.

8 0
2 years ago
17.a car is traveling at a constant velocity of 60 km/h for 4 hours means
Setler [38]
<span>Assuming the car is travelling in the same direction for the entire hour, the acceleration is zero.</span>
7 0
3 years ago
An object has a mass of 2,000kg. what is its weight on earth? show your work​
Rudiy27

Answer:

Answer: 19,600 N

Explanation:

Weight is a force, and force equals mass times acceleration. So the formula for weight is w = m • g

8 0
3 years ago
A pelican flying drops a fish from a height of 8.1 m. The fish travels 9.3 m horizontally before it hits the ground. The pelican
masya89 [10]
Using kinematics: 8.1 = 1/2(9.8)(t^2),
t = 1.2857 s.
Horizontal distance x travelled is x = vhorizontal * t, so 9.3 = v*1.2857, or v= 7.233 m/s horizontally.
7 0
4 years ago
An arbitrarily shaped piece of conductor is given a net negative charge and is alone in space. What can we say about the electri
Marat540 [252]

Answer:

The electrostatic potential within the conductor will be negative and constant throughout the conductor.

Explanation:

Whenever a conductor is charged the total charge is spread throughout the entire surface uniformly. Inside the conductor the net electric field is always zero. Also we know if \overrightarrow{E} e the electric field and V is the potential, then

\overrightarrow{E}= - \overrightarrow{\nabla}V

Now as in this case electric field within the conductor is zero, so potential (V) has to be constant.

8 0
3 years ago
Other questions:
  • State Archimedes' principle.​
    14·2 answers
  • Write the formula for Gay-Lussac's Law and state what parameters must be kept constant.​
    6·1 answer
  • What happens to an isotope that undergoes alpha decay
    15·1 answer
  • In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be n
    15·1 answer
  • Write down the factors on which moment depends upon ?​
    12·1 answer
  • What was your favorite thing to learn in physics
    8·1 answer
  • A particle covers 10m distance in 2sec. if final velocity is 8m/s, find initial velocity​
    10·2 answers
  • The water drops fall at regular intervals from a tap 5 m above the ground. The third drop is leaving the tap at the instant the
    6·1 answer
  • I WILL GIVE BRAINLIEST!!!
    7·1 answer
  • A projectile is launched with initial velocity vo. If a second projectile is launched with half of the initial velocity of the f
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!