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AlladinOne [14]
3 years ago
5

PLZ HELP 20 pt

Physics
1 answer:
forsale [732]3 years ago
8 0

Question 1:  The block in the illustration is floating in water, which has a density of 1.0 g/cm^3. About 40% of the block is below water. Even though we can't see the illustration, we estimate the density of the block to be about  0.40 g/cm ³ .

Question 2: The upward force that makes things float is called buoyancy.

Question 3: According to Pascal's principle, pressure through a fluid is  uniform.

Question 4: A wing achieves lift by forcing air to move faster over the top of the wing.

Question 5: Pressure is measured as  force per unit area.

Question 6: If the amount of a gas in a sealed container increases, the pressure in the container also increases.

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During the Patient Care Era, a more demanding and educated public now expected the pharmacist to be a therapeutic advisor and __
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Make a lot of money for what they do
3 0
4 years ago
Ch 31 HW Exercise 31.10 7 of 15 Constants You want the current amplitude through a inductor with an inductance of 4.90 mH (part
sergey [27]

Answer:

f = 130 Khz

Explanation:

In a circuit driven by a sinusoidal voltage source, there exists a fixed relationship between the amplitudes of the current and the voltage through any circuit element, at any time.

For an inductor, this relationship can be expressed as follows:

VL = IL * XL (1) , which is a generalized form of Ohm's Law.

XL is called the inductive reactance, and is defined as follows:

XL = ω*L = 2*π*f*L, where f is the frequency of the sinusoidal source (in Hz) and  L is the value of the inductance, in H.

Replacing in (1), by the values given of VL, IL, and L, we can solve for f, as follows:

f = VL / 2*π*IL*L = 12 V / 2*π*(3.00*10⁻³) A* (4.9*10⁻³) H = 130 Khz

5 0
3 years ago
The vacuum tube was replaced with what electrical component?
Rufina [12.5K]

Answer:

The vacuum tube was replaced with transistor.

Explanation:

  • The invention of semiconductor was very useful in making solid state transistor that allowed the production of small yet faster, cheaper, and more trusted and reliable computers.
  • These solid state transistor is so often used that, it nearly replaced all the use of transistor.
  • This replacement took place after the invention of semiconductor in the year around 1940.
  • Vacuum tubes also known as thermionic tubes are not used anymore in computers and electronics.  
7 0
4 years ago
How is the wavelength of a longitudinal wave determined?
Tju [1.3M]

Before answering the question, first we have to understand a longitudinal wave.

A longitudinal wave is a type of mechanical wave in which the direction of wave propagation is parallel to the particle vibration of the medium.

In this type of wave, there will be compressions and rarefactions. Compressions are the high pressure regions where the particles of the medium are very close to each other. The rarefactions are the low pressure regions of a longitudinal wave where the particles are not so close to each other.

Hence, a longitudinal wave is a series of compressions and rarefactions.

The wavelength of a longitudinal wave is defined as the distance between two successive compressions or rarefactions.

Hence, the correct answer to the question is C) by measuring the distance between adjacent rarefactions.

8 0
3 years ago
The distance between the lenses in a compound microscope is 18 cm. The focal length of the objective is 1.5 cm. If the microscop
Blababa [14]

Answer:

The focal length of eye piece is 6.52 cm.

Explanation:

Given that,

Angular Magnification of the microscope M = -46

the distance between the lens in microscope L= 16 cm

The focal length of objective f₀ = 1.5 cm

Normal near point N = 25 cm

Have to find focal length of eye piece f ₙ =?

The angular magnification is given by

M ≈ - (L-fₙ)N/f₀fₙ

Rearranging for fₙ

fₙ =L(1 - Mf₀/N)⁺¹

   =18/2.76

fₙ =  6.52 cm

The focal length of eye piece is 6.52 cm.

6 0
3 years ago
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