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3 years ago

How far does light travel in the time it takes sound to go 1 cm?

1 answer:

6 0

Sound travels at speed v=343 m/s, therefore the time the sound takes to cover a distance of
$S= 1 cm=0.01 m$
is
$t= \frac{S}{v}= \frac{0.01 m}{343 m/s}=2.9 \cdot 10^{-5} s$

Light travels at speed $c=3 \cdot 10^8 m/s$ , therefore the distance it travels during the same time t is
$S=ct=(3 \cdot 10^8 m/s)(2.9 \cdot 10^{-5} s)=8746 m=8.75 km$

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A high fountain of water is located at the center of a circular pool. Not wishing to get his feet wet, a student walks around th

Alisiya [41]

Answer:

The fountain is 3.43 m high.

Explanation:

Circumference of the pool = 15 m.

C = 2 $\pi$ r

where C is the circumference and r its radius.

r = $\frac{C}{2\pi }$

= $\frac{15}{2(\frac{22}{7}) }$

r = 2.3864

radius of the pool = 2.40 m

So that the height of the fountain, h, can be determined by applying trigonometric function.

Tan θ = $\frac{opposite}{adjacent}$

Tan 55 = $\frac{h}{2.4}$

h = Tan 55 x 2.4

= 1.4282 x 2.4

= 3.4277

h = 3.43 m

The height of the fountain is 3.43 m.

8 0

3 years ago

What is the period of a simple pendulum is its frequency is 20 Hz?

JulijaS [17]

Period = (1) / (frequency)

= (1) / (20/sec)

= 1/20 sec

5 0

4 years ago

A radio have a wavelength of 0.3m and travels at a speed of 300,000,000 m/s. What is the frequency of this wave?

Ilya [14]

The frequency of the wave is $1\cdot 10^9 Hz$

Explanation:

The frequency, the wavelength and the speed of a wave are related by the following equation:

$c=f \lambda$

where

c is the speed of the wave

f is the frequency

$\lambda$ is the wavelength

For the radio wave in this problem,

$\lambda = 0.3 m$

$c=300,000,000 m/s = 3\cdot 10^8 m/s$

Therefore, the frequency is:

$f=\frac{c}{\lambda}=\frac{3\cdot 10^8}{0.3}=1\cdot 10^9 Hz$

Learn more about waves here:

brainly.com/question/5354733

brainly.com/question/9077368

#LearnwithBrainly

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3 years ago

True or False Vectors

Llana [10]

Answer:

false

Explanation:

Resultant is a force with the combined effect of two or more forces. Even though a force is a vector, it is not part of the definition of a vector. Vectors a made of 2 or more components, depending on the dimension of the vector. A 2-D vector has two components, 3-D has three, and so on. In your case, you are probably generally working on 2-D vectors, so simply two components would be correct.

Read more on Brainly.com - brainly.com/question/17037287#readmore (check my answer in the comments)

6 0

3 years ago

A projectile, fired with unknown initial velocity, lands 20sec later on side of hill, 3000m away horizontally and 450m verticall

lorasvet [3.4K]

Explanation:

Given:

t = 20 seconds

x = 3000 m

y = 450 m

a) To find the vertical component of the initial velocity $v_{0y}$ , we can use the equation