268757
'\(n\) ' identical cubes each of mass ' \(m\) ' and edge ' \(L\) ' are on a floor. If the cubes are to be arranged one over the other in a vertical stack, the work to be done is
1 Lmng (n-1)/2
2 \(\operatorname{Lg}(n-1) / m n\)
3 (n-1)/Lmng
4 \(\mathrm{Lmng} / 2(\mathrm{n}-1)\)
Explanation:
\(\quad U_{i}=n m g \square \frac{L}{2} \boxminus, U_{f}=n m g \square \frac{n L}{2} \boxminus, W=U_{i}-U_{f}\)
Work, Energy and Power
268758
A chain of mass \(m\) and length ' \(L\) ' is over hanging from the edge of a smooth horizontal table such that \(3 / 4\)th of its length is lying on the table. The work done in pulling the chain completely on to the table is
1 \(\mathrm{mgL} / 16\)
2 \(\mathrm{mgL} / 32\)
3 \(3 \mathrm{mgL} / 32\)
4 \(\mathrm{mgL} / 8\)
Explanation:
\(W=\frac{m g l}{2 n^{2}}\)
Work, Energy and Power
268820
A weight of\(5 \mathrm{~N}\) is moved up a frictionless inclined plane from \(R\) to \(Q\) as shown.
What is the work done in joules?
1 15
2 20
3 25
4 35
Explanation:
\(\quad \mathrm{W}=\mathrm{mgh} \quad\)
Work, Energy and Power
268821
A\(5 \mathrm{~kg}\) stone of relative density 3 is resting at the bed of a lake. It is raised through a height of \(5 \mathrm{~m}\) in the lake. If \(g=10 \mathrm{~m} / \mathrm{s}^{2}\), then work done is
1 \(\frac{500}{3} \mathrm{~J}\)
2 \(\frac{350}{3} \mathrm{~J}\)
3 \(\frac{750}{3} \mathrm{~J}\)
4 \(\frac{550}{3} \mathrm{~J}\)
Explanation:
\(w=m g h \square^{\square}-\frac{d_{L}}{d_{B}} \square\)
268757
'\(n\) ' identical cubes each of mass ' \(m\) ' and edge ' \(L\) ' are on a floor. If the cubes are to be arranged one over the other in a vertical stack, the work to be done is
1 Lmng (n-1)/2
2 \(\operatorname{Lg}(n-1) / m n\)
3 (n-1)/Lmng
4 \(\mathrm{Lmng} / 2(\mathrm{n}-1)\)
Explanation:
\(\quad U_{i}=n m g \square \frac{L}{2} \boxminus, U_{f}=n m g \square \frac{n L}{2} \boxminus, W=U_{i}-U_{f}\)
Work, Energy and Power
268758
A chain of mass \(m\) and length ' \(L\) ' is over hanging from the edge of a smooth horizontal table such that \(3 / 4\)th of its length is lying on the table. The work done in pulling the chain completely on to the table is
1 \(\mathrm{mgL} / 16\)
2 \(\mathrm{mgL} / 32\)
3 \(3 \mathrm{mgL} / 32\)
4 \(\mathrm{mgL} / 8\)
Explanation:
\(W=\frac{m g l}{2 n^{2}}\)
Work, Energy and Power
268820
A weight of\(5 \mathrm{~N}\) is moved up a frictionless inclined plane from \(R\) to \(Q\) as shown.
What is the work done in joules?
1 15
2 20
3 25
4 35
Explanation:
\(\quad \mathrm{W}=\mathrm{mgh} \quad\)
Work, Energy and Power
268821
A\(5 \mathrm{~kg}\) stone of relative density 3 is resting at the bed of a lake. It is raised through a height of \(5 \mathrm{~m}\) in the lake. If \(g=10 \mathrm{~m} / \mathrm{s}^{2}\), then work done is
1 \(\frac{500}{3} \mathrm{~J}\)
2 \(\frac{350}{3} \mathrm{~J}\)
3 \(\frac{750}{3} \mathrm{~J}\)
4 \(\frac{550}{3} \mathrm{~J}\)
Explanation:
\(w=m g h \square^{\square}-\frac{d_{L}}{d_{B}} \square\)
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Work, Energy and Power
268757
'\(n\) ' identical cubes each of mass ' \(m\) ' and edge ' \(L\) ' are on a floor. If the cubes are to be arranged one over the other in a vertical stack, the work to be done is
1 Lmng (n-1)/2
2 \(\operatorname{Lg}(n-1) / m n\)
3 (n-1)/Lmng
4 \(\mathrm{Lmng} / 2(\mathrm{n}-1)\)
Explanation:
\(\quad U_{i}=n m g \square \frac{L}{2} \boxminus, U_{f}=n m g \square \frac{n L}{2} \boxminus, W=U_{i}-U_{f}\)
Work, Energy and Power
268758
A chain of mass \(m\) and length ' \(L\) ' is over hanging from the edge of a smooth horizontal table such that \(3 / 4\)th of its length is lying on the table. The work done in pulling the chain completely on to the table is
1 \(\mathrm{mgL} / 16\)
2 \(\mathrm{mgL} / 32\)
3 \(3 \mathrm{mgL} / 32\)
4 \(\mathrm{mgL} / 8\)
Explanation:
\(W=\frac{m g l}{2 n^{2}}\)
Work, Energy and Power
268820
A weight of\(5 \mathrm{~N}\) is moved up a frictionless inclined plane from \(R\) to \(Q\) as shown.
What is the work done in joules?
1 15
2 20
3 25
4 35
Explanation:
\(\quad \mathrm{W}=\mathrm{mgh} \quad\)
Work, Energy and Power
268821
A\(5 \mathrm{~kg}\) stone of relative density 3 is resting at the bed of a lake. It is raised through a height of \(5 \mathrm{~m}\) in the lake. If \(g=10 \mathrm{~m} / \mathrm{s}^{2}\), then work done is
1 \(\frac{500}{3} \mathrm{~J}\)
2 \(\frac{350}{3} \mathrm{~J}\)
3 \(\frac{750}{3} \mathrm{~J}\)
4 \(\frac{550}{3} \mathrm{~J}\)
Explanation:
\(w=m g h \square^{\square}-\frac{d_{L}}{d_{B}} \square\)
268757
'\(n\) ' identical cubes each of mass ' \(m\) ' and edge ' \(L\) ' are on a floor. If the cubes are to be arranged one over the other in a vertical stack, the work to be done is
1 Lmng (n-1)/2
2 \(\operatorname{Lg}(n-1) / m n\)
3 (n-1)/Lmng
4 \(\mathrm{Lmng} / 2(\mathrm{n}-1)\)
Explanation:
\(\quad U_{i}=n m g \square \frac{L}{2} \boxminus, U_{f}=n m g \square \frac{n L}{2} \boxminus, W=U_{i}-U_{f}\)
Work, Energy and Power
268758
A chain of mass \(m\) and length ' \(L\) ' is over hanging from the edge of a smooth horizontal table such that \(3 / 4\)th of its length is lying on the table. The work done in pulling the chain completely on to the table is
1 \(\mathrm{mgL} / 16\)
2 \(\mathrm{mgL} / 32\)
3 \(3 \mathrm{mgL} / 32\)
4 \(\mathrm{mgL} / 8\)
Explanation:
\(W=\frac{m g l}{2 n^{2}}\)
Work, Energy and Power
268820
A weight of\(5 \mathrm{~N}\) is moved up a frictionless inclined plane from \(R\) to \(Q\) as shown.
What is the work done in joules?
1 15
2 20
3 25
4 35
Explanation:
\(\quad \mathrm{W}=\mathrm{mgh} \quad\)
Work, Energy and Power
268821
A\(5 \mathrm{~kg}\) stone of relative density 3 is resting at the bed of a lake. It is raised through a height of \(5 \mathrm{~m}\) in the lake. If \(g=10 \mathrm{~m} / \mathrm{s}^{2}\), then work done is
1 \(\frac{500}{3} \mathrm{~J}\)
2 \(\frac{350}{3} \mathrm{~J}\)
3 \(\frac{750}{3} \mathrm{~J}\)
4 \(\frac{550}{3} \mathrm{~J}\)
Explanation:
\(w=m g h \square^{\square}-\frac{d_{L}}{d_{B}} \square\)
