3. A particle moves in the $\mathrm { X } - \mathrm { Y }$ plane under the influence of a force such that its linear momentum is $\vec { p } ( t ) = A [ \hat { i } \cos ( k t ) - \hat { j } \sin ( k t ) ]$, where $A$ and $k$ are constants. The angle between the force and the momentum is (A) $0 ^ { \circ }$ (B) $30 ^ { \circ }$ (C) $45 ^ { \circ }$ (D) $90 ^ { \circ }$ Answer [Figure] (A) [Figure] (A) [Figure] C) [Figure] (D) (B)
In the options given below, let E denote the rest mass energy of a nucleus and n a neutron. The correct option is
3. A particle moves in the $\mathrm { X } - \mathrm { Y }$ plane under the influence of a force such that its linear momentum is $\vec { p } ( t ) = A [ \hat { i } \cos ( k t ) - \hat { j } \sin ( k t ) ]$, where $A$ and $k$ are constants. The angle between the force and the momentum is\\
(A) $0 ^ { \circ }$\\
(B) $30 ^ { \circ }$\\
(C) $45 ^ { \circ }$\\
(D) $90 ^ { \circ }$\\
Answer
\begin{figure}[h]
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\caption{(A)}
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\begin{figure}[h]
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\caption{(A)}
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\caption{C)}
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(D)\\
(B)\\