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Rudik [331]
3 years ago
11

One astronomer believes that the density of the universe remains constant. One physicist believes that the density of the univer

se changes over a period of time. Which of these statements best explains why the astronomer and physicist have different views on the density of the universe? Most data on density of the universe are inaccurate. Scientists provide different theories to strengthen science. Scientists having different interests arrive at different conclusions. Most experiments on density of the universe cannot be repeated.
Physics
1 answer:
Alja [10]3 years ago
4 0
The correct option is this: SCIENTISTS HAVING DIFFERENT INTERESTS ARRIVE AT DIFFERENT CONCLUSIONS.
There are many fields in science and the scientists working in these fields have varying interests. The interests that a scientist has in a certain research will determines his views and conclusions about such a research.<span />
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A person hears sound wave beast at 3000Hz at the temperature of 30 °C. What is the person's ear canal length? Please explain
Evgen [1.6K]

Answer:

The person's ear canal length is 2.91 cm.

Explanation:

Given that,

Frequency = 3000 Hz

Temperature = 30°C

We need to calculate the speed

Using equation of sound wave with temperature

[texs]v(t)=331+0.6\times T[/tex]

Put the value of T

v(t)=331+0.6\times30^{\circ}\ C

v(t)=349\ m/s

We need to calculate the length

Using formula of closed organ pipe

f=\dfrac{v}{4L}

L=\dfrac{v}{4f}

Where, L = length

v = velocity

f = frequency

Put the value into the formula

L=\dfrac{349}{4\times3000}

L=0.0291\ m

L=2.91\times10^{-2}\ m

L=2.91\ cm

Hence, The person's ear canal length is 2.91 cm.

4 0
4 years ago
Which statement is
ELEN [110]

Answer:

A

Explanation: This is the correct answer

8 0
3 years ago
Read 2 more answers
The long-term effects of cocaine are _______ the short-term effects.
mestny [16]
Arguably, far more dangerous. Whilst the initial stimulating effects of cocaine (it does this by blocking the reuptake of dopamine by the transporter proteins) giving the user a sense of self confidence and euphoria can result in rash and impulsive decisions leading to problems - the real issues with it lie in the tolerance that results.
your brain always wants to keep neurotransmitter levels stable, so when the dopamine levels skyrocket because their reuptake is blocked, the brain responds by reducing dopamine synthesis and the number of receptors, meaning without cocaine, your dopamine levels drop to below the norm.
Withdrawal symptoms are the complete opposite, leading to a dependency on the drug which causes far more damage than the effects of the drug itself.
5 0
3 years ago
According to Bernoulli's equation, the pressure in a fluid will tend to decrease if its velocity increases. Assuming that a wind
Greeley [361]

Answer:

16.125 Pa

Explanation:

The Bernoulli equation despising the height changes is:

\frac{P_{2}-P_{1}}{pg}+(\frac{v_{2}^{2}-v_{1}^{2}}{2g})=0

The gravity constant can be cancelled.

Applying the equation to the first situation, v_{1}=0 , v_{2}=1, P_{2}-P_{1}=-0.645

The density 'p' may be calculated because it is the only unknown.

p=\frac{-2(P_{2}-P_{1})}{v_{2}^{2}}=\frac{-2*-0.645}{1^{2}}=1.29\frac{kg}{m^{3} }

Applying the equation to the second situation, where the only unknown is the pressure drop (P_{2}-P_{1}):

P_{2}-P_{1}=-p*(\frac{v_{2}^{2}-v_{1}^{2}}{2})

P_{2}-P_{1}=-1.29*(\frac{5_{2}^{2}}{2})=-16.125

In both cases the assumption is  v_{1}=0 because its supposed that the air is stored.

5 0
4 years ago
A rocket is fired vertically upward. At the instant it reaches an altitude of 2700 m and a speed of 274 m/s, it explodes into th
atroni [7]

Answer:

Explanation:

Given

initial velocity of particle u=274 m/s

one Particle moves up with velocity of v=235 m/s

and other moves u=484 m/s towards east

let v_y and v_x be the velocity of third Particle is Y and x direction

conserving momentum in y direction  

m(274)=\frac{m}{3}\times v_y+\frac{m}{3}\times 0+\frac{m}{3}\times 235

v=587 m/s

Now conserving momentum in  x direction

m\times 0=\frac{m}{3}\times v_x+\frac{m}{3}\times 0+\frac{m}{3}\times 484

v_x=-484 m/s

Net Velocity of third Particle

v^2=v_x^2+v_y^2

v=\sqrt{v_x^2+v_y^2}

v=\sqrt{484^2+587^2}

v=760.80 m/s  

7 0
3 years ago
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