The frictional force of the air on a body of mass 0.25 kg, falling with an accleration of 9.2 m/s², will be

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Important Questions on Laws of Motion

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Beta Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise (Conceptual Questions)>Q 87

A block of mass 15 kg is placed on a long trolley. The coefficient of friction between the block and trolley is 0.18. The trolley accelerates from rest with 0.5 m/s² for 20 s. then what is the friction force ?

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Beta Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise (Conceptual Questions)>Q 88

A pump is used to deliver water at a certain rate from a given pipe. To obtain n times water from the same pipe in the same time, by what factor, the force of the motor should be increased?

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Beta Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise (Conceptual Questions)>Q 89

A boy holds a pendulum in his hand while standing at the edge of a circular platform of radius r rotating at an angular speed

ω

. The pendulum will hang ai an angle

θ

with the vertical so that :
(Neglect length of pendulum)

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Beta Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise (Conceptual Questions)>Q 90

One end of a uniform wire of length

L

and weight

w

is attached rigidly to a point in the roof and weight

w_{1}

is suspended from its lower end. If

S

is the area of cross-section of the wire, the stress in the wire at a height of

\frac{3 L}{4}

from its lower end is

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Beta Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise (Conceptual Questions)>Q 91

As shown in the figure, to light springs of force constant $K_{1}$ , and $K_{2}$ , oscillate a block of mass $M$ . Its effective force constant will be :

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