Table of Contents

## How do you find the speed of a boat in still water?

In water, the direction along the stream is called downstream. And, the direction against the stream is called upstream. If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Speed downstream = (u + v) km/hr.

**How do you calculate the speed of light in water?**

Refractive index = Speed of light in vaccum / Speed of light in water. It is denotes as n = c / v, v = c / n= 3 × 10^8 m/s / (1.33) = 2.25 × 10^8 m/s. Therefore, refractive index of the water can be measure by the Speed of light in water is 2.25 × 10^8 m/s.

**Is the speed of light the same in water?**

Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index of 1.3; see Figure 2) and 200,000 kilometers per second in glass (refractive index of 1.5).

### What is speed and how is speed calculated?

How To Calculate Speed? A: For a body moving at a uniform velocity you can calculate the speed by dividing the distance traveled by the amount of time it took, for example one mile in 1/2 hour would give you 2 miles per hour. If the velocity is non-uniform all you can say is what the average speed is.

**Does light actually slow down in water?**

Yes. Light is slowed down in transparent media such as air, water and glass. The ratio by which it is slowed is called the refractive index of the medium and is always greater than one. This was discovered by Jean Foucault in 1850.

**How is the speed calculated?**

The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time. In this example, distance is in metres (m) and time is in seconds (s), so the units will be in metres per second (m/s).

#### How to calculate the speed of a boat?

On flat, un-moving water, count the number of seconds it takes you to move your boat past a fixed object from bow to stern. Do the math. Or, you can just jump directly to calculating your total speed the same way. While paddling, on the moving water, count the seconds it takes to move past a fixed object.

**How to calculate the velocity of water in a pipe?**

Consider the flow rate as 20 gpm and diameter of the pipe as 30 inches, then the. Water Velocity = ( 0.4085 * 20 ) / ( 30 2 ) = ( 8.17 ) / 900. = 0.009077.

**How is the speed of a wave calculated?**

So the wave speed is approximately 1.249 times the square root of the wavelength. Reversing it, you can say that the wavelength is approximately the square of the wave speed divided by 1.249.

## What is the average speed of a river?

The river speed is 4 mph. How about a little more complicated example where the numbers don’t divide nice and evenly. Let’s say the leaf floats past your 15-foot boat in 3 seconds. That’s 5 feet per second.