Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 40

HARD

NEET

IMPORTANT

Earn 100

A force acts on a $3 gm$ particle in such a way that the position of the particle as a function of time is given by $x = 3 t - 4 t^{2} + t^{3},$ where $x$ is meters and $t$ is in seconds. The work done during the first $4$ second is

50% studentsanswered this correctly

Important Questions on Work, Energy and Power

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 41

The relationship between force and position is shown in the figure given (in one dimensional case). The work done by the force in displacing a body from $x = 1 cm$ to $x = 5 cm$ is -

Question Image

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 42

A body of mass

3 kg

is under a constant force which causes a displacement

s

in metres in it, given by the relation

s = \frac{1}{3} t^{2},

where

t

is in

second

. Work done by the force in

2

second

is:

HARD

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 43

The work done by the frictional force on a pencil in drawing a circle of radius

r

on the surface having a normal pressing force

N

(coefficient of friction

μ_{x}

) is :

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 44

A force

F = 5 + 2 x

acts on a body in

x

-direction where

x

is in metres and

F

in newton. Find the work done in displacing the body from

x = 0

to

x = 2 m .

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 45

A particle of mass

2 kg

travels according to equation

S = (3 t^{3} + 2 t) m .

. Find the work done in

3 s

of its motion.

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 46

A particle moves under the effect of a force,

F = C x

from

x = 0

to

x = x_{1}

. The work done in the process is

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 47

A force

\vec{F} = (5 \hat{i} + 3 \hat{j} + 2 \hat{k}) N

is applied over a particle which displaces it from origin to the point

\vec{r} = (2 \hat{i} - \hat{j}) m \cdot

The work done on the particle in joules is

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 48

The kinetic energy of a body of mass

2 kg

and momentum of

2 Ns

is