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bogdanovich [222]
2 years ago
14

Why is it important to use placebos and a double-blind approach in some studies

Physics
1 answer:
viktelen [127]2 years ago
6 0
Another name for these two words is "constant" and you want to have a "constant", because you want something to compare your experimental group to, to see whether data had changed or not. So you have placebos or a double- blind to compare your experimental group to it and also so you know you don't have a bias or anything in the study.
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What is the requirement for a core to be used in an electromagnet?
xxMikexx [17]

D. It must be able to be magnetized

Explanation:

The requirement for a core to be used in an electromagnet is that it must be able to be magnetized.

An electromagnet is a type of magnet produced by electricity.

  • They typically run and produce magnetic fields in the vicinity of electrical currents.
  • These magnets are not permanent magnets.
  • When the electrical current is removed, the magnetic property of the substance is lost.
  • The core of an electromagnet is usually made up of a material that can easily be magnetized in the presence of magnetic fields.
  • Some of the materials used are cobalt, iron, nickel.

learn more:

Electromagnet brainly.com/question/2191993

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8 0
3 years ago
A proton and an electron are released from rest in the center of a capacitor.
Sunny_sXe [5.5K]

Answer:

a)  equal 1, b) less than 1

Explanation:

a) the electric force is given by

         Fe = q E

The charge of the electron and proton has the same value, that of the proton is positive and that of the electron is negative

Proton

        Fp = qE

Electron

         Fe = - q E

         Fp / Fe = -1

If we do not take into account the sign the relationship is equal to one (1)

b) to calculate the force we use Newton's second law

           F = ma

           qE = m a

           a = q E / m

The mass of the proton much greater than the mass of the electron

          ap = q E / m_{p}

          ae = - q E /  m_{e}

          ap / ae =  m_{e} /  m_{p} =  m_{e}/1600  m_{e} =1/1600

 It is much smaller than 1

7 0
3 years ago
The index of refraction of the first medium must be greater than the index of refraction of the second medium for total internal
laiz [17]
I think it’s true but I’m not really sure
4 0
3 years ago
Science please help !!
Andreyy89
4 earth years is the answer
8 0
2 years ago
When sugar is poured from the box into the sugar bowl, the rubbing of sugar grains creates a static electric charge that repels
WARRIOR [948]

Explanation:

In order to calculate the force, we will use the following formula.

                    F = k \frac{q_{1}q_{2}}{r^{2}}

where,    q_{1} = q_{2} = 3.0 \times 10^{-11} C

                r = 8.0 \times 10^{-5} m

Therefore, we will put the given values into the above formula as follows.

                 F = k \frac{q_{1}q_{2}}{r^{2}}

                    = 9 \times 10^{9} \frac{3 \times 10^{-11} \times 3 \times 10^{-11}}{(8.0 \times 10^{-5})^{2}}

                    = 1.265 \times 10^{-3} N

Thus, we can conclude that the given two grains will repel each other by a force of 1.265 \times 10^{-3} N.

6 0
3 years ago
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