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sesenic
2 days ago
6

Match the process with the fundamental interaction responsible for this process. - Protons in a nucleus repel each other. -The E

arth pulls on the Moon. -Protons and neutrons attract each other in a nucleus. -A neutron outside a nucleus decays into a proton, electron, and antineutrino. with these : 1- The electromagnetic interaction 2- the gravitational interaction 3- The weak interaction 4- The strong interaction
Physics
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When you urinate, you increase pressure in your bladder to produce the flow. For an elephant, gravity does the work. An elephant
ValentinkaMS [3465]

Answer:

a) v = 1.19 m/s, b) P₁ = 0.922 x 10⁵ Pa

Explanation:

1) We will apply the fluid continuity equation

       Q = A v

The area of a circle is

      A = π r² = π d²/4

     

     v = Q / A = Q 4 / π d²

     v = 0.006 4/π 0.08²

     v =  1.19 m/s

2) Apply Bernoulli's equation, considering point 1 as the bladder and point 2 as where the urine exits

     P₁ + ½ ρ v₁² + ρ g y₁ = P₂ + ½ ρ v₂² + ρ g y₂

The problem states that

P₂ = 1.0013 x 10⁵ Pa

v₁ = 0

y₁ = 1 m

y₂ = 0

Density of water (ρ) = 1000 kg/m³

      P₁ + ρ y₁ = P₂ + ½ ρ v₂²

      P₁ = P₂ + ½ ρ v₂² - ρ g y₁

      P₁ = 1.013 x 10⁵ + ½ 1000 (1.19)² - 1000 9.8 1

      P₁ = 1.013 x 10⁵ + 708.5  - 9800

      P₁ =  92208.5 Pa

      P₁ = 0.922 x 10⁵ Pa

8 0
3 months ago
The model of the atom has changed as scientists have gathered new evidence. Four models of the atom are shown below, but one imp
Maru [3345]

Answer: Dalton’s model

Explanation:

The image provided depicts four atomic models, each marked with a letter:

W corresponds to the current widely accepted atomic model: a nucleus surrounded by an electron cloud, where the positions and orbits of electrons around the nucleus are defined by regions (linked to specific energy levels) where the probability of finding an electron is highest. It's key to note that this model was refined through the contributions of quantum physics by Louis de Broglie and Erwin Schrodinger.

X refers to Rutherford's model (developed after Thomson's model). Ernest Rutherford conducted experiments that confirmed Thomas's atomic theory. Yet, the results led him to discover that there was a core of charge in the atom (later termed the nucleus) surrounded by electrons. Thus, a new atomic model was introduced, showcasing a positively charged nucleus enveloped by negatively charged electrons, resembling the solar system.

Y denotes Thomson's model, often called the plum pudding model. This scientist identified that atoms include smaller charged particles, defined as electrons. At that point, without knowledge of the atomic nucleus, Thomson theorized that electrons floated in a positively charged substance that balanced the negative charge of the electrons, similar to raisins in pudding or bread.

Z symbolizes Bohr's model. Proposed by Danish physicist Niels Bohr after Rutherford's findings, this model incorporates Rutherford’s concept but adds that electrons travel in specific orbits around the nucleus at varying energy levels.

Hence, the absent model is Dalton's model, recognized as the first atomic model: the atom visualized as an indivisible, solid sphere. This was a generally accepted notion at the time, dating back to ancient Greek philosophy.

4 0
3 months ago
Read 2 more answers
A uniform beam resting on two pivots has a length L = 6.00 m and weight M = 220 lbs. The pivot under the left end exerts a norma
Keith_Richards [3271]
x = 4,138 m. In this problem, we invoke the rotational equilibrium equation. Fixing our reference on the left-side pivot establishes the positive direction for counterclockwise rotation: ∑ τ = 0, leading to formulas where x = (-WL/2 + 4n₂) / W_woman. Converting to SI units where M = 2.72 kg and M_woman = 59.09 kg, and establishing equilibrium equations yields n₁ + n₂ = (2.72 + 59.09) 9.8. In cases where the system initiates rotation, n₁ equals 0, thus finding n₂ = 605,738 N. Calculation for x gives 4,138 m.
4 0
2 months ago
The amount of energy necessary to remove an electron from an atom is a quantity called the ionization energy, Ei. This energy ca
Keith_Richards [3271]

Answer:

The resulting value is E_i = 1.5596 *10^{-18} \ J.

Explanation:

The question specifies that

The wavelength is \lambda = 48.2 nm = 48.2 *10^{- 9 }\ m.

The velocity is v = 2.371*10^6 \ m/s.

The mass of the electron is m_e = 9.109*10^{-31} \ kg.

The energy of the incoming light is typically depicted mathematically as

E = \frac{h * c}{\lambda}.

Here, c represents the speed of light with the value c = 3.0 *10^{8} \ m/s.

h stands for Planck's constant with a value of h = 6.62607015 * 10^{-34 } J\cdot s.

Thus,

E = \frac{6.62607015 * 10^{-34 }* 3.0 *10^{8}}{48.2 *10^{- 9 }}

=> E = 4.12 *10^{-18} \ J.

Typically, kinetic energy is represented as

E_k = \frac{1}{2} * m_e * v^2

=> E_k = \frac{1}{2} * 9.109*10^{-31} * (2.371*10^6 )^2.

=> E_k = 2.56 *0^{-18} \ J.

The ionization energy is generally expressed mathematically as

E_i = 4.12 *10^{-18} - 2.56 *0^{-18}

=> E_i = 1.5596 *10^{-18} \ J.

8 0
3 months ago
A book that weighs 0.35 kilograms is kept on a shelf that’s 2.0 meters above the ground. A picture frame that weighs 0.5 kilogra
Softa [3030]
Upon calculating, I'm nearly certain that the answer is "...to a height of 1.4 meters." Happy to assist!:)
4 0
2 months ago
Read 2 more answers
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