Kinematics (NEET Physics): Questions 131 - 135 of 229

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Question number: 131

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A particle moves in a circle of radius 10cm with a linear speed of 20m/s. The angular velocity will be –

Choices

Choice (4) Response

a.

25 rad/s

b.

75 rad/s

c.

50 rad/s

d.

200 rad/s

Question number: 132

» Kinematics » Motion in a Straight Line

MCQ▾

Question

If t 1 be the time taken by a body to clear the top of a building and be the time spent in air, then t 2: t 1 will be -

Choices

Choice (4) Response

a.

2: 1

b.

1: 1

c.

1: 2

d.

1: 4

Question number: 133

» Kinematics » Motion in a Straight Line

Assertion-Reason▾

Assertion (Ꭺ)

A cyclist is cycling on rough horizontal circular track with increasing speed. Then the frictional force on cycle is always directed towards center of the circular track.

Reason (Ꭱ)

For a particle moving in a circle, radial component of net force should be directed towards center. You have to select the correct choice.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

Question number: 134

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The angular speed with which the earth would have to rotate on its axis so that a person on the equator would weigh (3/5) th as much as present, will be: (Take the equatorial radius as 6400 km)

Choices

Choice (4) Response

a.

7.8 x 10 3 rad/sec

b.

7.8 x 10 4 rad/sec

c.

8.7 x 10 3 rad/sec

d.

8.7 x 10 4 rad/sec

Passage

Velocity at a general point P (x, y) for a horizontal projectile motion is given by

V = VX2+VY2 tanα = VYVX

The image is velocity graph.

The Image Is Velocity Graph.

here in following fig we shows that the projectile motion of particle at some point to another point.

α is angle made by v with horizontal in clockwise direction Trajectory equation for a horizontal projectile motion is given by x = v x t = ut

y =- ( 12 ) gt 2

Picture display is velocity graph.

Picture Display Is Velocity Graph.

here in fig we shows that angle α made by v with horizontal in clockwise direction

Eliminating t, We get y =- 12 gx2u2

Question number: 135 (1 of 3 Based on Passage) Show Passage

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

An aeroplane is flying horizontally with a velocity of 720 km/h at an altitude of 490 m. When it is just vertically above the target a bomb is dropped from it. How far horizontally it missed the target?

Choices

Choice (4) Response

a.

2000 m

b.

200 m

c.

1000 m

d.

100 m

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