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#22-Uniform-Circular-Motion

(Physics) > Laws of Motion

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Related Practice Questions :

In a uniform circular motion, which of the following quantity is not constant

(1) Angular momentum

(2) Speed

(3) Kinetic energy

(4) Momentum

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A cyclist turns around a curve at 15 miles/hour. If he turns at double the speed, the tendency to overturn is ** **

(1) Doubled

(2) Quadrupled

(3) Halved

(4) Unchanged

PMT - 1974

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If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be

(1) $mg+\frac{m{v}^{2}}{r}$

(2) $mg-\frac{m{v}^{2}}{r}$

(3) $\frac{{m}^{2}{v}^{2}g}{r}$

(4) $\frac{{v}^{2}g}{r}$

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A motor cyclist moving with a velocity of 72 *km*/*hour* on a flat road takes a turn on the road at a point where the radius of curvature of the road is 20 *meters*. The acceleration due to gravity is 10 *m*/*sec*^{2}. In order to avoid skidding, he must not bend with respect to the vertical plane by an angle greater than

(1) $\theta ={\mathrm{tan}}^{-1}6$

(2) $\theta ={\mathrm{tan}}^{-1}2$

(3) $\theta ={\mathrm{tan}}^{-1}25.92$

(4) $\theta ={\mathrm{tan}}^{-1}4$

PMT - 1986

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Two masses *M* and *m* are attached to a vertical axis by weightless threads of combined length *l*. They are set in rotational motion in a horizontal plane about this axis with constant angular velocity ω. If the tensions in the threads are the same during motion, the distance of *M* from the axis is

(1) $\frac{Ml}{M+m}$

(2) $\frac{ml}{M+m}$

(3) $\frac{M+m}{M}l$

(4) $\frac{M+m}{m}l$

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