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ladessa [460]
3 years ago
5

The invention and use of the microscope showed scientists that germs could cause illness. Although there had been various unders

tandings before for why people become ill, the discovery that microscopic germs can make people sick completely changed scientific understanding of why diseases exist and spread. This change is an example of what?
Physics
1 answer:
Nastasia [14]3 years ago
5 0

Answer:

Explanation:

The invention of microscope is a huge step towards the scientific research at that time.

It tries to explain the characteristic and nature of the microscopic bodies and even help to understand its cycle.

It even explains why germs causes us to sick and the small details present in any of the substance around. It helps to identified the microscopic structure of the substance and is a very important research in field of science and technology.

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Which device uses a rotating magnetic field to produce an electric current?
Kay [80]
<span>The correct answer is C) a motor.
In particular, we are talking about an AC motor, which produces an alternating current. In an AC motor, a coil is immersed in a rotating magnetic field. Due to the motion of the magnetic field,the angle between the direction of the field and the surface enclosed by the coil changes. As a result, the magnetic flux through the coil changes over time (the magnetic flux is given by:
</span>\phi=BAcos\theta<span>
where B is the intensity of the magnetic field, A is the area enclosed by the coil and </span>\theta<span> is the angle between the direction of B and the perpendicular to the plane of the coil). For Faraday-Newmann-Lenz law, this change in flux induces an electromotive force (emf) into the coil, according to:
</span>emf=- \frac{d \Phi}{dt}<span>
 where the numerator is the variation of magnetic flux and dt is the time interval. This emf in the coil produced an electrical current in the circuit.</span>
7 0
3 years ago
Read 2 more answers
A woman wearing athletic clothing outside. The woman is stretching her legs in a lunge position. Based on the nonverbal messages
Inessa05 [86]

Answer:

D

Explanation:

4 0
3 years ago
A truck is traveling 70.0 kph away from you. The driver is blowing the horn, which has a frequency of 400 Hz. The air temperatur
Helga [31]
Use this site is better https://www.cymath.com/
4 0
3 years ago
The membrane that surrounds a certain type of living cell has a surface area of 7.1 x 10-9 m2 and a thickness of 1.5 x 10-8 m. A
hoa [83]

Answer:

Q = +1.4 pC

Explanation:

  • The capacitance of any capacitor, by definition, is as follows:
  •  C = \frac{Q}{V} (1)
  • Applying Gauss'Law and the definition of electric potential, it can be showed that the capacitance of a parallel-plate capacitor can be expressed as follows:
  •  C = \frac{\epsilon_{r}*\epsilon_{0} * A}{d} (2)
  • Where εr is the dielectric constant of the material that fills the space between the plates, A is the area of one of the plates, and d, is the separation between them.
  • Replacing by the givens in (2) we can find the value of the capacitance C, as follows:

       C = \frac{\ 4.4*8.85e-12C2/N*m2*7.1e-9m2}{1.5e-8m} = 18.4e-12 F = 18.4 pF

  • Replacing the values of C and V in (1), we can solve for Q, as follows:

       Q = C*V = 18.4e-12 F* 75.9e-3 V = 1.4e-12 C = +1.4 pC

  • As the outer surface is at a higher potential that the inside surface, the charge on it must be positive, and is equal to +1.4 pC.
7 0
3 years ago
A pipe with cross-sectional area 2.0 m^2 is joined to a second pipe with cross-sectional area 0.5 m^2. The pipes are both comple
IRISSAK [1]

Answer:

v_2=8\ m/s

Explanation:

It is given that,

Area of cross section of the pipe, A_1=2\ m^2

Area of cross section of the another pipe, A_2=0.5\ m^2

Speed of water in first pipe, v_1=2\ m/s

To find,

Speed of the water flowing in the second pipe.

Solve,

Let v_2 is the speed of water flowing in the second pipe. The relation between the area of cross section and the velocity is given by the continuity equation. It is given by :

A_1v_1=A_2v_2

v_2=\dfrac{A_1v_1}{A_2}

v_2=\dfrac{2\times 2}{0.5}

v_2=8\ m/s

Therefore, the water is flowing in the second pipe at the rate of 8 m/s.

3 0
3 years ago
Read 2 more answers
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