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#34-Failure-of-Newton's-Laws

(Physics) > Laws of Motion

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Related Practice Questions :

The value of M of the hanging block is in the figure, which will prevent the smaller block (m=1 kg) from slipping over the triangular block. All the surfaces are smooth and string and pulley are ideal. (Given: M'=4 kg and $\theta ={37}^{0}$)

1. 12 kg

2. 15 kg

3. 10 kg

4. 4 kg

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A plumb line is suspended from a ceiling of a car moving with horizontal acceleration of *a*. What will be the angle of inclination with vertical

(1) tan^{–1}(*a*/*g*)

(2) tan^{–1}(*g*/*a*)

(3) cos^{–1}(*a*/*g*)

(4) cos^{–1}(*g*/*a*)

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A block is kept on a frictionless inclined surface with angle of inclination '*α*'. The incline is given an acceleration '*a*' to keep the block stationary. Then *a* is equal to

(1) *g*

(2) *g* tan *α*

(3) *g* / tan *α *

(4) *g* cosec *α*

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On the horizontal surface of a truck (*μ* = 0.6), a block of mass 1 *kg* is placed. If the truck is accelerating at the rate of 5*m/sec*^{2} then frictional force on the block will be

(1) 5 *N*

(2) 6 *N *

(3) 5.88 *N*

(4) 8 *N *

PMT - 2001

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A block of mass m is in contact with the cart C as shown in the figure.

The coefficient of static friction between the block and the cart is $\mu .$The acceleration $\alpha $ of the cart that will prevent the block from falling satisfies

1. $\alpha >\frac{mg}{\mu}$ 2. $\alpha >\frac{g}{\mu m}$

3. $\alpha \ge \frac{g}{\mu}$ 4. $\alpha <\frac{g}{\mu}$

NEET - 2010

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