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
djverab [1.8K]
3 years ago
6

A flat sheet of ice has a thickness of 1.4 cm. It is on top of a flat sheet of crown glass that has a thickness of 3.0 cm. Light

strikes the ice perpendicularly and travels through it and then through the crown glass. In the time it takes the light to travel through the two sheets, how far would it have traveled in a vacuum?
Physics
1 answer:
MAXImum [283]3 years ago
3 0

Answer:

t = 2.13 10-10 s , d = 6.39 cm

Explanation:

For this exercise we use the definition of refractive index

        n = c / v

Where n is the refraction index, c the speed of light and v the speed in the material medium.

The refractive indices of ice and crown glass are 1.13 and 1.52, respectively, therefore the speed of the beam in the material medium is

        v = c / n

As the beam strikes perpendicularly, the beam path is equal to the distance of the leaves, there is no refraction, so we can use the uniform motion relationships

        v = d / t

        t = d / v

        t = d n / c

Let's look for the times on each sheet

Ice

        t₁ = 1.4 10⁻² 1.31 / 3 10⁸

        t₁ = 0.6113 10⁻¹⁰ s

Crown glass (BK7)

        t₂ = 3.0 10⁻² 1.52 / 3.0 10⁸

        t₂ = 1.52 10⁻¹⁰ s

Time is a scalar therefore it is additive

         t = t₁ + t₂

         t = (0.6113 + 1.52) 10⁻¹⁰

         t = 2.13 10-10 s

The distance traveled by this time in a vacuum would be

        d = c t

       d = 3 10⁸ 2.13 10⁻¹⁰

       d = 6.39 10⁻² m

       d = 6.39 cm

You might be interested in
One major difference between plant and animal cells is that plant cells are the only ones with A) cellulose. B) lysosomes. C) nu
stira [4]
The correct answer is A .
5 0
4 years ago
Read 2 more answers
A capacitor consists of two metal surfaces separated by an insulating layer. A new capacitor has no charge on either of its surf
mihalych1998 [28]
<h2>Answer:</h2><h3>(A) the positively charged surface increases and the energy stored in the capacitor increases.</h3>

When charging a capacitor transferring charge from one surface to the other, the first surface becomes negatively charged while the second surface becomes positively charged. As you transfer the charge, the voltage of the positively charged surface increases and the energy stored in the capacitor also increases. We can solve this by the definition of <em>capacitance</em><em> </em>that is <em>a  measure of the ability of a capacitor  to store energy. </em>For any capacitor, the capacitance is  a constant defined as:

C=\frac{Q}{V_{ab}}

To maintain C constant, if Q increases V also increases.

On the other hand, the potential energy U can be expressed as:

U=\frac{Q^{2}}{2C}

In conclusion, as Q increases the potential energy also increases.

5 0
3 years ago
The magnetic field strength at the north pole of a 2.0-cmcm-diameter, 8-cmcm-long Alnico magnet is 0.10 TT. To produce the same
hoa [83]

Given Information:  

Current = I = 2.5 A  

Magnetic field = B = 0.10 T  

Radius = r = d/2 = 0.02/2 = 0.01 m

Length = L = 8 cm = 0.08 m

Required Information:  

Number of turns = N = ?  

Answer:  

Number of turns = N ≈ 2547 turns

Step-by-step explanation:  

The approximate model to find the number of turns is given by

B = μ₀nI

Where n = N/L

so

B = μ₀NI/L

N = BL/μ₀I  

Where B is the magnetic field, L is the length of the solenoid, I is the current and μ₀ is the permeability of free space

N = (0.10*0.08)/(4πx10⁻⁷*2.5)

N ≈ 2547 Turns

6 0
3 years ago
Read 2 more answers
What velocity must a 1240 kg car have in order to have the same
Bond [772]

Answer:

90

Explanation:

cause

6 0
3 years ago
can y'all please help me I really need you guys or just give me an idea or wrote the first paragraph please​
elixir [45]
Write about some struggles you’ve faced and what they can do to avoid those struggles. Maybe also what you personally learned from the struggle too.
7 0
3 years ago
Other questions:
  • A brick is dropped from 100m up. Find it's impact velocity and air time.
    11·1 answer
  • The continental crust has the average composition of _____.
    9·2 answers
  • When the activation energy of an exothermic reaction decreases at a given temperature, the reaction rate increases because the _
    10·1 answer
  • Which of these events is an example of resonance?
    10·2 answers
  • PLZ HELP DUE TONIGHT
    11·1 answer
  • 3. What is the mass of a paratrooper who experiences an air resistance of 400 N and an acceleration of 4.5 m/s2
    10·1 answer
  • A series circuit contains a 9-volt battery, a 3-ohm resistor and a 2-ohm resistor. What is the voltage drop across the 2-ohm res
    10·2 answers
  • Question 9
    15·1 answer
  • How much power is required to lift a 2.00-kg object 5.00 meters in 4.50 seconds? (If there is a formula for this please, tell me
    8·1 answer
  • A moving car has 2000 J of kinetic energy. If the speed doubles, how much kinetic energy would it have?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!