Solving for Power & Speed: A Homework Challenge

Click For Summary
The homework challenge involves calculating the power after traveling 8 km, given that power is halved every 2 km from an initial power of 10 watts. After 8 km, the power would be reduced to 0.625 watts. Additionally, the speed of light in optical fiber is questioned, with the refractive index (n) provided as 1.55. The speed of light in a vacuum is approximately 3 x 10^8 m/s, which can be adjusted for the refractive index to find the speed in fiber. The discussion highlights the need for a formula to relate power and distance.
reallydumb
Messages
4
Reaction score
0

Homework Statement


Every 2km power is reduced by half. Initial power = 10watt. What is power after traveled 8km?

C = 3x108. What is speed of light passing through optic fibre? n = 1.55

Homework Equations



P = \frac{w}{T} ?

The Attempt at a Solution


I don't know where to start
 
Last edited:
Physics news on Phys.org
Write a formula relating power and distance.....
P = 10(2-km/2)
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
View full post »

Similar threads

What is the relationship between engine power, force, and speed?
  • · Replies 8 ·
Replies
8
Views
4K
Worksheet Problem about Power (average power of a car accelerating up a hill)
  • · Replies 2 ·
Replies
2
Views
2K
Ratio of Power between Two Cars
  • · Replies 14 ·
Replies
14
Views
2K
Calculating Belt Pull, Drum Torque, Motor Power & Speed
  • · Replies 4 ·
Replies
4
Views
2K
How Do You Calculate Power in These Physics Problems?
  • · Replies 5 ·
Replies
5
Views
2K
Fizeau's Experiment (Speed of light)
  • · Replies 6 ·
Replies
6
Views
4K
Power output of a intercooler and turbocharger
  • · Replies 1 ·
Replies
1
Views
2K
Maximum speed of car on downhill
  • · Replies 1 ·
Replies
1
Views
2K
Power & Velocity Homework Solution | 450 kW
  • · Replies 5 ·
Replies
5
Views
2K
Max speed given power and resistive forces
  • · Replies 2 ·
Replies
2
Views
1K