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#2-Common-Forces-in-Mechanics-Normal-Reaction

(Physics) > Laws of Motion

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Related Practice Questions :

If rope of lift breaks suddenly, the tension exerted by the surface of lift (*a* = acceleration of lift)

(1) *mg*

(2) *m*(*g* + *a*)

(3) *m*(*g* – *a*)

(4) 0

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If two forces of 5 *N* each are acting along *X* and *Y* axes, then the magnitude and direction of resultant is

(1) $5\sqrt{2},\text{\hspace{0.17em}\hspace{0.17em}}\pi /3$

(2) $5\sqrt{2},\text{\hspace{0.17em}\hspace{0.17em}}\pi /4$

(3) $-5\sqrt{2},\text{\hspace{0.17em}\hspace{0.17em}}\pi /3$

(4) $-5\sqrt{2},\text{\hspace{0.17em}\hspace{0.17em}}\pi /4$

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Three blocks of masses *m*_{1}, *m*_{2} and *m*_{3} are connected by massless strings as shown on a frictionless table. They are pulled with a force *T*_{3} = 40 N. If *m*_{1} = 10 kg, *m*_{2} = 6 kg and *m*_{3} 4 kg, the tension *T*_{2} will be

(1) 20 *N*

(2) 40 *N*

(3) 10 *N*

(4) 32 *N*

PMT - 1998

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A body of weight 2*kg *is suspended as shown in the figure. The tension *T*_{1} in the horizontal string (in *kg* *wt*) is

(1) $2/\sqrt{3}$

(2) $\sqrt{3}/2$

(3) $2\sqrt{3}$

(4) 2

PMT - 2002

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A false balance has equal arms. An object weigh *X* when placed in one pan and *Y* when placed in other pan, then the weight *W* of the object is equal to** **

(1) $\sqrt{XY}$

(2) $\frac{X+Y}{2}$

(3) $\frac{{X}^{2}+{Y}^{2}}{2}$

(4) $\frac{2}{\sqrt{{X}^{2}+{Y}^{2}}}$

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