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3 years ago

Which arrangement in relative size is correct? (< sign means 'smaller than')

Physics

2 answers:

dusya [7]3 years ago

6 0

The right option is D.

galina1969 [7]3 years ago

3 0

Answer:

D. electron < neutron < atomic nucleus < atom

Explanation:

size of an electron = 2.82 * 10^{-15} m.

size of a neutron = 0.8 * 10^{-15} m.

size of a atomic nucleus = 1.56 * 10^{-14} m.

size of an atom = 0.1 - 0.5 nanometers

hence if we compare the size of all components we will see size of an electron is the smallest and size of an atom is the largest.

electron < neutron < atomic nucleus < atom

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3 years ago

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3 years ago

The Heaviside function H is defined by H(t)={0 if t<0, 1 if t≥0 It is used in the study of electric circuits to represent the

Studentka2010 [4]

Answer:

$V(t)= 240V* H(t-5)$

Explanation:

The heaviside function is defined as:

$H(t) =1 \quad t\geq 0\\H(t) =0 \quad t$

so we see that the Heaviside function "switches on" when $t=0$ , and remains switched on when $t>0$

If we want our heaviside function to switch on when $t=5$ , we need the argument to the heaviside function to be 0 when $t=5$

Thus we define a function f:

$f(t) = H(t-5)$

The $-5$ term inside the heaviside function makes sure to displace the function 5 units to the right.

Now we just need to add a scale up factor of 240 V, because thats the voltage applied after the heaviside function switches on. ( $H(t-5) =1$ when $t\geq 5$ , so it becomes just a 1, which we can safely ignore.)