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3 years ago

Isotopes of hydrogen react, forming the element helium, as shown.

Physics

1 answer:

forsale [732]3 years ago

6 0

Answer:

B. nuclear fusion

Explanation:

Atomic fusion is a process in which two or more lighter nuclei combine to form a heavier nucleus.

The mass of the single nucleus thus formed is lighter than the initial mass.

There is a difference in mass in the heavier nucleus thus formed. According to Einstein's mass-energy equation, the change in mass is equated towards energy.

The energy liberated in the process is called as thermo-nuclear energy.

As in the case of isotopes of hydrogen fuses to form helium, the nuclear reaction is given by relation

₁H³ + ₁H² → ₂He⁴ + ₀n¹ + energy

Thus, the nuclear reaction of hydrogen isotopes forming helium is nuclear fusion.

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When can a high speed velocity cause damage?'

sweet-ann [11.9K]

Answer:

50 Mph.

Explanation:

According to the National Severe Storms Laboratory, winds can really begin to cause damage when they reach 50 mph. But here’s what happens before and after they reach that threshold, according to the Beaufort Wind Scale (showing estimated wind speeds): - at 19 to 24 mph, smaller trees begin to sway.

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3 years ago

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3 years ago

a boy pulls 23 kg box with a 100 N force at 39 above a horizontal surface if the coefficient of kinetic friciton between the box

tatuchka [14]

Answer:

Total work done is 2606.08 J.

Explanation:

Given :

Mass of box , m = 23 kg .

Force applied , F = 100 N .

Angle from horizon , $\theta=39^o$ .

Coefficient of kinetic friction , $\mu=0.16$ .

Distance travelled by box , d = 34 m .

Now ,

Total work done = work done by boy + work done by friction.

$W=Fdcos\theta+f_sdcos\theta=Fd-\mu(mg) \\\\W=100\times cos39^o\times 34-0.16\times 23 \times 9.8 \\\\W=77.71\times 34-36.06=2606.08\ J.$

Hence , this is the required solution.

6 0

3 years ago

Who did not have experimental evidence to support his theory of the atom? Dalton Thomson Rutherford Democritus

Aloiza [94]

Democritus was the one who did not have experimental evidence to support his theory of the atom.

Answer: Option 4

Explanation:

The discovery of atoms were first stated by Democritus but due to the absence of any experimental proof, his statement was not noted as significant at that time.

After this, Dalton made the specific assumptions formulating some postulates for the atomic theory with proof. Then the cathode rays tube experiments performed by Thomson lead to the formation of plum pudding models of atom.

This is followed by Rutherford’s gold foil experiment discovering the presence of nucleus inside the atoms. So, Democritus first stated but due to absence of experimental evidences, his theory of atoms were not supported at that time.

3 0

3 years ago

In the Olympic shotput event, an athlete throws the shot with an initial speed of 13.0 m/s at a 47.0° angle from the horizontal.

MariettaO [177]

Answer:

18.7 m

Explanation:

$v_{o}$ = initial speed of the shot = 13 m/s