Laws of Motion (NEET Physics): Questions 89 - 94 of 114

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Passage

Read the passage given below and answer the questions that follows:

Finding elongation of the spring

Finding Elongation of the Spring

A bead of mass m is attached to one end of a spring of natural length R

A bead of mass m is attached to one end of a spring of natural length R and spring constant K=(3+1)mgR The other end of the spring is fixed at point A on a smooth ring of radius R as shown in figure. When bead is released to move then

Question number: 89 (1 of 3 Based on Passage) Show Passage

» Laws of Motion » Force and Inertia

MCQ▾

Question

The normal reaction force at B is -

Choices

Choice (4) Response

a.

3 3 mg/2

b.

3 3 mg

c.

3 mg

d.

mg/2

Question number: 90 (2 of 3 Based on Passage) Show Passage

» Laws of Motion » Force and Inertia

MCQ▾

Question

Tangential acceleration of bead just after it is released.

Choices

Choice (4) Response

a.

3g4

b.

g2

c.

2g3

d.

g4

Question number: 91 (3 of 3 Based on Passage) Show Passage

» Laws of Motion » Force and Inertia

MCQ▾

Question

Initial elongation in the spring is -

Choices

Choice (4) Response

a.

2R

b.

R

c.

2R

d.

3R

Question number: 92

» Laws of Motion » Force and Inertia

MCQ▾

Question

A bob is hanging over a pulley inside a car through a string. The second end of the string is in the hand of a person standing in the car. The car is moving with constant acceleration ‘a’ directed horizontally as shown in figure. Other end of the string is pulled with constant acceleration ‘a’ vertically. The tension in the string is –

A bob is hanging over a pulley inside a car through a string

A Bob Is Hanging Over a Pulley Inside a Car Through a String

Finding the tension in the string

Choices

Choice (4) Response

a.

mg2+a2

b.

mg2+a2+ma

c.

m (g - a)

d.

mg2+a2ma

Question number: 93

» Laws of Motion » Laws of Friction

MCQ▾

Question

Block A weighs 4 N and block B weighs 8 N. The coefficient of kinetic friction is 0.25 for all surfaces. find the force F to slide B at a constant speed when A is held at rest.

Choices

Choice (4) Response

a.

1N

b.

2N

c.

3N

d.

4N

Question number: 94

» Laws of Motion » Force and Inertia

MCQ▾

Question

In the above question, if at the end of 4 sec, the string be cut, the position of each particle in next 2 seconds will respectively be -

Choices

Choice (4) Response

a.

17.856 m, 21.344 m

b.

-17.856 m, -21.344 m

c.

-21.344 m, 17.856 m

d.

-17.856 m, 21.344 m

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