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3 years ago

Most scientists believe the Big Bang Theory explains which of the following questions?

Physics

2 answers:

Anuta_ua [19.1K]3 years ago

8 0

Answer:

The Big Bang Theory is: How are Universe began.

kari74 [83]3 years ago

5 0

A how our planets and moons formed

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Guiana dolphins are one of the few mammals able to detect electric fields. In a test of sensitivity, a dolphin was exposed to th

iren [92.7K]

Answer:

0.05 V/m

Explanation:

V = Potential difference that is possible for the dolphin to detect = 0.5 mV

d = Distance between electrodes = 1 cm

Electric field strength is given by

$E=\dfrac{V}{d}$

$\Rightarrow E=\dfrac{0.5\times 10^{-3}}{1\times 10^{-2}}$

$\Rightarrow E=0.05\ V/m$

The corresponding electric field strength is 0.05 V/m

8 0

3 years ago

If the magnitude of the initial velocity of the ball v0 = 7.94 ± 0.03, and the "gun" is tilted 31 ± 0.4º upwards, what is the un

ycow [4]

Answer:

0.05

Explanation:

Given a variable C which is the product of two variables A, B:

$C=A\cdot B$

Then the absolute error on C is given by:

$\frac{\sigma_C}{C}=\frac{\sigma_A}{A}+\frac{\sigma_B}{B}$

where $\sigma_A, \sigma_B, \sigma_C$ are the uncertanties on the measure of A, B and C, respectively.

In this problem, the horizontal component of the velocity $v_x$ is given by

$v_x = v_0 cos \theta$

Therefore, the uncertainty on vx is given by:

$\frac{\sigma_{v_x}}{v_x}=\frac{\sigma_{v_0}}{v_0}+\frac{\sigma_{cos \theta}}{cos \theta}$ (1)

where we have:

$v_0 = 7.94$

$\sigma_{v_0}=0.03$

$\theta=31^{\circ}$ , so

$cos \theta=cos 31^{\circ}=0.857$

The uncertainty on $cos \theta$ is given by:

$\sigma_{cos \theta}=|sin \theta|\sigma_\theta$

where:

$|sin \theta| = |sin 31^{\circ}|=0.515$

and

$\sigma_\theta=0.4^{\circ}=0.007 rad$

$\sigma_{cos \theta}=|0.515|\cdot 0.007 = 0.0036$

Also,

$v_x = v_0 cos \theta = (7.94)(cos 31^{\circ})=6.81 m/s$

So, combininb everything into (1), we find:

$\sigma_{v_x}=(\frac{\sigma_{v_0}}{v_0}+\frac{\sigma_{cos \theta}}{cos \theta})v_x=(\frac{0.03}{7.94}+\frac{0.0036}{0.857})(6.80)=0.05$

4 0

3 years ago

a piece of space junk of mass 24kg is at a distance of 7.00 x 10(power 6)m from the centre of the Earth. What is the gravitation

My name is Ann [436]

Answer:

F = 195 N

Explanation:

F = GMm/d²

F = 6.67e-11(5.97e24)(24) / (7.00e6)²

F = 195 N

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3 years ago

which of the following ideas provided an important step toward a more complete understanding of blackbody radiation?

Alekssandra [29.7K]

The theory of blackbody radiation is shown by the equation. E= h×f
Where E = energy of the photon, f is the frequency of photon and h is equal to 6.63 ×10⁻³⁴ J.s in the plank constant. Light exists in form of a bundle of energy which is called photon and its energy is determined by frequency.
Therefore, any emission or absorption of light must involve discrete changes in energy of the system. Light is composed of discrete chunks that must be absorbed as a unit.

7 0

3 years ago

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A wave travels at a constant speed. How does the frequency change if the wavelength is reduced by a factor of 4

sweet-ann [11.9K]

The product of (wavelength) x (frequency) is always the same number ... the wave's speed.

So if the wavelength is somehow reduced to 1/4 its original length, the <em>frequency is immediately multiplied by 4</em> . That's the only way their product can remain the same.

4 0

3 years ago

Read 2 more answers