Answer:
r₁ = 20.5 cm
Explanation:
In this exercise we can use the conservation of energy
the gravitational power energy is always attractive, the electrical power energy is repulsive if the charges are of the same sign
starting point.
Em₀ = U_g + U_e + K = 
the two in the kinetic energy is because they are two particles
final point. When it is detained
Em_f = U_g + U_e = 
the energy is conserved
Em₀ = em_f
the charges and masses of the two particles are equal
sustitute the values
-6.67-11 (4.5 10-3) ² / 0.25 - 9, 109 (30 10-9) ² / 0.25 + 4.5 10-3 4² = - 6.67 10- 11 (4.5 10-3) ² / r1 -9 109 (30 10-9) ² / r1
-5.4 10⁻¹⁵ + 3.24 10⁻⁵ - 7.2 10⁻⁵ = -1.35 10⁻¹⁵ / r₁ + 8.1 10⁻⁶ / r₁
We can see that the terms that correspond to the gravitational potential energy are much smaller than the terms of the electric power, which is why we depress them.
3.24 10⁻⁵ - 7.2 10⁻⁵ = 8.1 10⁻⁶ / r₁
-3.96 10⁻⁵ = 8.1 10⁻⁶ / r₁
r₁ = 8.1 10⁻⁶ /3.96 10⁻⁵
r₁ = 2.045 10⁻¹ m
r₁ = 20.5 cm
Answer
I think most see black and white.
The answer is D) second/meter
Answer:
the answer es c, the doppler Shift of spectral lines within the galaxy's spectrum
Explanation:
This is due to redshift, red approach or redshift, occurs when electromagnetic radiation, usually visible light, which is emitted or reflected from an object, is shifted to red at the end of the electromagnetic spectrum. More generally, redshift is defined as an increase in the wavelength of electromagnetic radiation received by a detector compared to the wavelength emitted by the source. This increase in wavelength corresponds to a decrease in the frequency of electromagnetic radiation. Instead, the decrease in wavelength is called blue shift. Any increase in wavelength is called "redshift", even if it occurs in electromagnetic radiation of non-visible wavelengths, such as gamma rays, X-rays and ultraviolet radiation. This designation can be confusing since at longer wavelengths than red (eg infrared, microwave and radio waves), "redshifts" move away from the red wavelength. So when talking about frequencies of waves smaller than red continues to mean that the wavelength tends to lengthen and not resemble red.
A redshift can occur when a light source moves away from an observer, corresponding to a Doppler shift that changes the perceived frequency of the sound waves. Although the observation of such redshifts, or their counterpart, towards blue, has numerous terrestrial applications (eg Doppler radar and radar gun), astronomical spectroscopy uses Doppler redshifts to determine the movement of distant astronomical objects. This phenomenon was first predicted and observed in the 19th century when scientists began to consider the dynamic implications of the wave nature of light.
