Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 29

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IMPORTANT

Earn 100

If a body moving in a circular path maintains constant speed of $10 m s^{- 1}$ , then which of the following correctly describes the relation between acceleration and radius?

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Important Questions on Kinematics

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 30

A particle is performing uniform circular motion along the circumference of a circle of diameter

50 cm

with frequency

2 Hz

. The acceleration of the particle in

m s^{- 2}

is:

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 31

A solid body rotates with angular velocity

ω = a t \hat{i} + b t^{2} \hat{j}

where

a = 1 rad s^{- 2}

and

b = 0.5 rad s^{- 3}

and

t

is in seconds. Calculate the angle between the vectors of the angular velocity and the angular acceleration at

t = 1 \sec

.

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 32

The angular velocity of a ceiling fan reduces to

50 %

after

36

rotations since it is switched off. Assuming uniform retardation, the number of rotations it further makes before coming to rest is

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 33

If

\vec{P} + \vec{Q} = \vec{P} - \vec{Q}

and

θ

is the angle between

\vec{P}

and

\vec{Q}

, then

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 34

The sum and difference of two perpendicular vectors, of equal lengths, are

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 35

A car is moving on a straight road, due north, with a uniform speed of

50 km h^{- 1}

, when it turns left through

90 °

. If the speed remains unchanged after turning, the change in the velocity of the car, in the turning process, is

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 36

The following sets of three vectors act on a body. In which case, the resultant cannot be zero?

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 37

The

x

and

y

components of a force are

2 N

and

- 3 N

. The force is