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2 years ago

For each pair of terms below, write a sentence that summarizes how they are different.

Physics

1 answer:

Maksim231197 [3]2 years ago

5 0

Answer:

Thermal expansion ,thermal contraction

Explanation:

They are different because it has different cause and chemical reactions

thermal contraction is a chemical reaction

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Scientific work is currently underway to determine whether weak oscillating magnetic fields can affect human health. For example

nlexa [21]

Answer:

The maximum emf that can be generated around the perimeter of a cell in this field is $1.5732*10^{-11}V$

Explanation:

To solve this problem it is necessary to apply the concepts on maximum electromotive force.

For definition we know that

$\epsilon_{max} = NBA\omega$

Where,

N= Number of turns of the coil

B = Magnetic field

$\omega =$ Angular velocity

A = Cross-sectional Area

Angular velocity according kinematics equations is:

$\omega = 2\pi f$

$\omega = 2\pi*61.5$

$\omega =123\pi rad/s$

Replacing at the equation our values given we have that

$\epsilon_{max} = NBA\omega$

$\epsilon_{max} = NB(\pi (\frac{d}{2})^2)\omega$

$\epsilon_{max} = (1)(1*10^{-3})(\pi (\frac{7.2*10^{-6}}{2})^2)(123\pi)$

$\epsilon_{max} = 1.5732*10^{-11}V$

Therefore the maximum emf that can be generated around the perimeter of a cell in this field is $1.5732*10^{-11}V$

6 0

3 years ago

If the diameter of the space station is 730 m , how many revolutions per minute are needed for the "artificial gravity" accelera

nignag [31]

For circular motion we know that

F=ma=v^2/r 

Therefore: 

v = sqrt (rma) 

Also, for cicular motion: 

rev/min. = 60v/(2r*pi) 

So your equation is: 

rev./min = 60sqrt(rma)/(2pi*r) 

For the mass (m) we can just use 1 kg.

rev./min = 60sqrt(730*1*9.8)/(2pi*730) =60sqrt(7154)/(4584.4)
rev./min = 60sqrt(7154)/(4584.4) =1.11 rev/min

the answer is 1.11 rev/min

4 0

3 years ago

Which model could represent a neutral atom of boron?

UNO [17]

Answer:

model 3

Explanation:

Boron with atomic number 5 will have 3 valence electrons

5 0

3 years ago

Read 2 more answers

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