Home/Class 11/Physics/

Question and Answer

Why spin angular velocity of a star is greatly enhanced when it collapses under gravitational pull and becomes a neutron star ?
loading
settings
Speed
00:00
02:13
fullscreen
Why spin angular velocity of a star is greatly enhanced when it collapses under gravitational pull and becomes a neutron star ?

Answer

On collapsing under gravitational pull, size of star decreases. Therefore, its moment of inertia decreases. As angular momentum \({\left({L}={I}\omega\right)}\) is conserved, and \({I}\) decreases, therefore, spin angular velocity \(\omega\) increases.
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
Correct22
Incorrect0
Watch More Related Solutions
How many of \({g}\) of \({S}\) are required to produce \({10}\text{moles}\) and \({10}{g}\) of \({H}_{{{2}}}{S}{O}_{{{4}}}\) respectively?
The pair of compounds which cannot exist in solution is:
(A) \({N}{a}{H}{C}{O}_{{{3}}}\) and \({N}{a}{O}{H}\)
(B) \({N}{a}_{{{2}}}{S}{O}_{{{3}}}\) and \({N}{a}{H}{C}{O}_{{{3}}}\)
(C) \({N}{a}_{{{2}}}{C}{O}_{{{3}}}\) and \({N}{a}{O}{H}\)
(D) \({N}{a}{H}{C}{O}_{{{3}}}\) and \({N}{a}{C}{l}\)
\({100}{m}{L}\) each of \({0.5}{N}{N}{a}{O}{H},{N}/{5}{H}{C}{l}\) and \({N}/{10}{H}_{{{2}}}{S}{O}_{{{4}}}\) are mixed together. The resulting solution will be:
(A) Acidic
(B) Neutral
(C) Alkaline
(D) none of these
When a metal is burnt, its weight is increased by \({24}\%\). The equivalent weight of the metal wil be:
(A) \({25}\)
(B) \({24}\)
(C) \({33.3}\)
(D) \({76}\)
A mixture of hydrogen and oxygen gas weighing \({0.76}{g}\) has volume 2 liter temperature \({300}{K}\) and pressure \({100}{k}{P}{a}\) Calculate masses of hydrogen and oxygen in gas mixture Assume ideal nature .
Calculate van der Waals constansts a and b if critical temperature and critical pressure are \({30}^{{\circ}}{C}\) and 72 atm respectively .
A radioactive element gets spilled over the floor of a room. Its half life period is 30 days. If the initial activity is ten times the permissibel value, after how many days will it be safe to enter the room?
(A) \(\equiv{1000}\) days
(B) \(\equiv{300}\) days
(C) \(\equiv{10}\) days
(D) \(\equiv{100}\) days
Oxidation number of \({C}{l}\) in \({N}{O}{C}{l}{O}_{{{4}}}\) is:
(A) \(+{7}\)
(B) \(-{7}\)
(C) \(+{5}\)
(D) \(-{5}\)
Which of the following reaction depicts the oxidsing behaviour of \({H}_{{{2}}}{S}{O}_{{{4}}}\)?
(A) \({2}{H}{I}+{H}_{{{2}}}{S}{O}_{{{4}}}\rightarrow{I}_{{{2}}}+{S}{O}_{{{2}}}+{2}{H}_{{{2}}}{O}\)
(B) \({C}{a}{\left({O}{H}\right)}_{{{2}}}+{H}_{{{2}}}{S}{O}_{{{4}}}\rightarrow{C}{a}{S}{O}_{{{4}}}+{2}{H}_{{{2}}}{O}\)
(C) \({N}{a}{C}{l}+{H}_{{{2}}}{S}{O}_{{{4}}}\rightarrow{N}{a}{H}{S}{O}_{{{4}}}+{H}{C}{l}\)
(D) \({2}{P}{C}{l}_{{{5}}}+{H}_{{{2}}}{S}{O}_{{{4}}}\rightarrow{2}{P}{O}{C}{l}_{{{3}}}+{2}{H}{C}{l}+{S}{O}_{{{2}}}{C}{l}_{{{2}}}\)
For the reaction,
\({C}+{O}_{{{2}}}\rightarrow{C}{O}_{{{2}}},\Delta{H}=-{393}{J}\)
\({2}{Z}{n}+{O}_{{{2}}}\rightarrow{2}{Z}{n}{O},\Delta{H}=-{412}{J}\)
Which one is correct ?
(A) Carbon can reduce \({Z}{n}{O}\) to \({Z}{n}\)
(B) Oxidation of carbon is not feasible
(C) Oxidation of \({Z}{n}\) is not feasible
(D) \({Z}{n}\) liberates more heat than carbon during oxidation

Load More