Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 108

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A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector $\vec{a},$ is correctly shown in which of the following figure ?

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Important Questions on Kinematics

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 109

When a ceiling fan is switched off, its angular velocity reduces to

50 %

while it makes

36

rotations. How many more rotations will it make before coming to rest? (Assume uniform angular retardation)

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 2>Q 1

A particle has initial velocity

(2 \hat{i} + 3 \hat{j})

and acceleration

(0.3 \hat{i} + 0.2 \hat{j})

. The magnitude of velocity after

10

seconds will be

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

If $\vec{A} = 3 \hat{i} + \hat{j} + 2 \hat{k}$ and $\vec{B} = 2 \hat{i} - 2 \hat{j} + 4 \hat{k}$ , then the value of $|\vec{A} \times \vec{B}|$ will be

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

The position of a particle as a function of time is given by

\vec{r} (t) = A \cos ω t \hat{i} + B \sin ω t \hat{j}

where

A

and

B

are two real positive constants with

A > B

. The orbit of the particle looks like-

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 2>Q 4

A particle is moving with speed

6 m s^{- 1}

along the direction of

\vec{A} = 2 \hat{i} + 2 \hat{j} - \hat{k}

. Then its velocity is

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 2>Q 5

If

\vec{A}

and

\vec{B}

are two non-zero vectors such that,

| \vec{A} + \vec{B} | = \frac{| \vec{A} - \vec{B} |}{2}

and

|\vec{A}| = 2 |\vec{B}|

, then the angle between

\vec{A}

and

\vec{B}

is

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 2>Q 6

A projectile is given an initial velocity of

(\hat{i} + 2 \hat{j}) m s^{- 1}

, where

\hat{i}

is along the ground and

\hat{j}

is along the vertically upward direction. If

g = 10 m s^{- 2}

, the equation of its trajectory is :

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 2>Q 7

Four projectiles are fired with the same velocities at angles

25 °, 40 °, 55 °

and

70 °

with the horizontal. The range of projectile will be largest for the one projected at angle _____.