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3 years ago

Which hygiene step would best help prevent the flu

Physics

2 answers:

beks73 [17]3 years ago

5 0

Answer:

taking a shower brushing your teeth and washing your hands

Explanation:

bixtya [17]3 years ago

3 0

Answer:

D. Washing your hands regularly

Explanation:

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4. Explain the doppler effect. Be sure to talk about how the wave changes, the perceived change hear by a person that an emitted

Lemur [1.5K]

Answer:

4) The Doppler effect is the frequency change that occurs in a wave by the relative movement of the emitter and the observer

5) Sound originates from a repetitive movement of air molecules

6) The principle of stable superposition that if the medium complies with the elastic regime, the waves traveling in it can be added

Explanation:

4) The Doppler effect is the frequency change that occurs in a wave by the relative movement of the emitter and the observer. In the specific case of the fixed observer, each wave that is emitted travels at a constant speed, but as the emitter approaches the next wave lLa in less time, so the wave maxima are closer to each other

v = λ’ f’

λ‘=λ -Δλ = λ - vs / f

f’= v / λ’ = v / (λ - vs / f) = v / (v / f - vs / f)

f ‘= f v / (v-vs)

5) Sound originates from a repetitive movement of air molecules, this movement creates a longitudinal wave, which we call sound. It is characterized by the air volume module and its density

6) The principle of stable superposition that if the medium complies with the elastic regime, the waves traveling in it can be added

y total = y₁ + y₂

Let's see as an example two waves of the same amplitude that travel in the same direction, if this wave the maximums coincide they add up obtaining that the maximums are twice the amplitude

If the wave goes in the most directive but the maximum of one coincides with the minimum in the other, the sum gives zero,

The wave travels in the opposite direction, in this case the resulting wave in constant in time and we call it resonance

7 0

3 years ago

Which of the following displays has the highest hz frequency

Ganezh [65]

Answer:

Plasma

Explanation:

3 0

3 years ago

Which law states that that the direction of the induced current is such that the magnetic field resulting from the induced curre

Vikentia [17]

Lenz's law or option B for plato users

6 0

3 years ago

Read 2 more answers

In an attempt to reduce the extraordinarily long travel times for voyaging to distant stars, some people have suggested travelin

alexandr402 [8]

Answer:

a) $v=0.999124c$

b) $E=7.566*10^{22}$

c) $E_a=760 times\ larger$

Explanation:

From the question we are told that

Distance to Betelgeuse $d_b=430ly$

Mass of Rocket $M_r=20000$

Total Time in years traveled $T_d=36years$

Total energy used by the United States in the year 2000 $E_{2000}=1.0*10^20$

Generally the equation of speed of rocket v mathematically given by

$v=\frac{2d}{\triangle t}$

$v=860ly/ \triangle t$

where

$\triangle t=\frac{\triangle t'}{(\sqrt{1-860/ \triangle t)^2}}$

$\triangle t=\frac{36}{(\sqrt{1-860/ \triangle t)^2}}$

$\triangle t=\sqrt{(860)^2+(36)^2}$

$\triangle t=860.7532$

Therefore

$v=\frac{860ly}{ 860.7532}$

$v=0.999124c$

Generally the equation of the energy E required to attain prior speed mathematically given by

$E=\frac{1}{\sqrt{1-(v/c)^2} }-1(20000kg)(3*10^8m/s)^2$

$E=7.566*10^{22}$

c)Generally the equation of the energy $E_a$ required to accelerate the rocket mathematically given by

$E_a=\frac{E}{E_{2000}}$

$E_a=\frac{7.566*10^{22}}{1.0*10^{20}}$

$E_a=760 times\ larger$

8 0

4 years ago

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.2 m/s. The car is a distanc

dem82 [27]

Explanation:

It is known that the relation between speed and distance is as follows.

velocity = $\frac{distance}{time}$

As it is given that velocity is 6 m/s and distance traveled by the bear is (d + 29). Therefore, time taken by the bear is calculated as follows.

$t_{bear} = \frac{(d + 29)}{6 m/s}$ ............. (1)

As the tourist is running in a car at a velocity of 4.2 m/s. Hence, time taken by the tourist is as follows.

$t_{tourist} = \frac{d}{4.2}$ ............. (2)

Now, equation both equations (1) and (2) equal to each other we will calculate the value of d as follows.

$t_{bear} = t_{tourist}$

$\frac{(d + 29)}{6 m/s}$ = $\frac{d}{4.2}$

4.2d + 121.8 = 6d

d = $\frac{121.8}{1.8}$

= 67.66

Thus, we can conclude that the maximum possible value for d is 67.66.

5 0

3 years ago