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3 years ago

What types of natural disasters are most common in our areas?

2 answers:

8 0

You didn’t specify where. But the most common natural disaster is flood. Most common in the east coast is hurricanes. Most common in the west coast is earthquake.

qwelly [4]3 years ago

5 0

Floods are most likely where I like but it all depends where u like

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Can someone answer these/

dezoksy [38]

Problem 9

Formula and Givens

f' = observed frequency ?
f = actual frequency 300 Hz
v = velocity of sound or light waves. 343 m/s
vo = velocity of observer 25 m/s
vs = velocity of source. 50 m/s

f' = (v - vo) * f / (v + vs)

This time it really matters how the equations is set up. In point of fact the trains are moving away from each other and the observer and source are going in opposite directions. That will lower the frequency.

So you want the numerator to decrease and the denominator to increase. This will give you a minimum reading.

f' = (343 - 25) * f / (343 + 50)

f' = 318 * 300 / 393

f' = 242

Answer C

Problem 10

This problem is both instructive and very subtle. There are two shifts that take place. The first is the stationary car (vs = 0) to the moving car (vo ≠ 0) and the second is when the moving car reflects(vs ≠0) the signal back to the observer (who is not moving vo = 0)

First shift.

(v + vo)/(v + vs) = (v + s)/v You have to add the speed of the moving car to the speed of sound to get the maximum in the numerator.

Second shift

(v + vo) / (v + vs) = v/(v - s) You need to subtract the speed of the car from the speed of sound to get the maximum. The over all maximum effect happens when the two shifts are multiplied together. When that happens the single "v"s are cancelled and you are left with

(v+s)/(v - s) Don't forget that s is the moving speed of the car. The rest of it is straight forward. You are solving for s

f' = f * (v + s)/(v - s) Substitute known values

1250 = 1200 (343 + s)/(343 - s) Divide both sides by 1200

1.04167 = (343 + s) / (343 - s) Multiply both sides by 343 - s

1.04167 * (343 - s) = 343 + s Remove the brackets.

357.29 - 1.04167*s = 343 + s Subtract 343 from both sides.

14.292 - 1.04167*s = s Add 1.04s to both sides.

14.292 = 2.04167s Divide by 2.04167

14.292/2.04167 = s

s = 6.999988

which the question rounds to 6.9. The difference in answers comes from what to use for v. SQDF thinks the V was 340 which is an acceptable approximation.

Full credit goes to him for figuring out the double shift. This is a remarkable piece of physics. Study to realize how radar works.

6 0

4 years ago

What do we call factors that control traits

True [87]

The factors that control traits are the alleles. They are determined by two chromosomes which is obtained from the parents. For instance, you are able to roll your tongue, you have two chromosomes one for being able to roll and the other for not being able but since you have that ability you get the allele of being able to roll out your tongue.

8 0

3 years ago

. The total energy when a body falls freely towards earth remains constant. True or false?

Colt1911 [192]

This is true, The total energy when a body falls freely towards earth remains constant.

7 0

3 years ago

Red light of wavelength 630 nm passes through two slits and then onto a screen that is 1.4 m from the slits. The center of the 3

VARVARA [1.3K]

Answer:

Part a)

$f = 4.76 \times 10^{14} Hz$

Part b)

$d = 3.48 \times 10^{-4} m$

Part c)

$\theta = 0.311 degree$

Explanation:

Part a)

As we know that the speed of light is given as

$c = 3 \times 10^8 m/s$

$\lambda = 630 nm$

now the frequency of the light is given as

$f = \frac{c}{\lambda}$

so we have

$f = \frac{3 \times 10^8}{630 \times 10^{-9}}$

$f = 4.76 \times 10^{14} Hz$

Part b)

Position of Nth maximum intensity on the screen is given as

$y_n = \frac{n\lambda L}{d}$

so here we know for 3rd order maximum intensity

$y_3 = 0.76 cm$

n = 3

L = 1.4 m

$0.76 \times 10^{-2} = \frac{3(630 \times 10^{-9})(1.4)}{d}$

$d = 3.48 \times 10^{-4} m$

Part c)

angle of third order maximum is given as

$d sin\theta = 3 \lambda$

$3.48 \times 10^{-4} sin\theta = 3(630 \times 10^{-9})$

$\theta = 0.311 degree$

8 0

3 years ago

A bicycle and rider travel along a road. Which of the following statements is true?

Ugo [173]

<em>A bicycle and rideer travel along a road. the true about the sentence is: a. the bicycle and the rider undergo translation. The rider moving because you have to push the pedals and make the bike moves too.</em>

3 0

3 years ago