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One body moves on another moving body Wedge A is moving with a

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One body moves on another moving body Wedge A is moving with acceleration a as shown in figure. Find acceleration of block B w.r.t. : (i) Wedge A

$a$
$a sin θ$
$a cos θ$
$a cot θ$

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One body moves on another moving body Wedge A is moving with acceleration a as shown in figure. Find acceleration of block B w.r.t. : (i) Wedge A

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Practice more questions on Mechanics

Question 1

Hard

A uniform metal rod

(A B)

of mass

m

and length

L

is lying on a rough incline. The inclination of the incline and coefficient of friction between the rod and the incline is

θ = 3 7^{\circ}

and

μ = 1.0

respectively.

tan 3 7^{\circ} = \frac{3}{4}

(a) If temperature increases the rod expands. However, there is a point

P

on the rod which does not move. Find the distance of this point from the lower end of the rod.
(b) If the temperature falls the rod contracts. Once again there is a point

Q

which does not move. Find distance of

Q

from the lower end the rod.
(c) Will the repeated expansion and contraction cause the rod to slide down?

Topic:

Thermal properties of Matter

Book:

Problems in Physics II for IIT JEE (McGraw Hill)

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Question 2

Easy

If the value of g acceleration due to gravity at earth surface is

10 m s^{- 2}

. Its value in

m s^{- 2}

at the centre of the earth, which is assumed to be a sphere of radius

R

metre and uniform mass density is

$5$
$10/ R$
$10/2 R$
Zero

Topic:

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Question 3

Hard

A student skates up a ramp that makes an angle

3 0^{\circ}

with the horizontal. He/she starts (as shown in the figure) at the bottom of the ramp with speed

v_{0}

and wants to turn around over a semicircular path

x yz

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R

during which he/she reaches a maximum height

h

(at point

y

) from the ground as shown in the figure. Assume that the energy loss is negligible and the force required for this turn at the highest point is provided by his/her weight only. Then (

g

is the acceleration due to gravity

$v_{0}^{2} - 2 g h = \frac{1}{2} g R$
$v_{0}^{2} - 2 g h = \frac{3}{2} g R$
the centripetal force required at points $x$ and $z$ is zero
the centripetal force required is maximum at points $x$ and $z$

Topic:

Work, Energy and Power

Exam:

JEE Advanced 2020

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Question 4

Hard

Two balls, 1 and 2 , are moving uniformly in an

x y

plane. At

t = 0

, ball 1 is at origin and has a velocity

v_{1} = 82 ms^{- 1}

in the direction shown in the figure. At this moment, ball 2 is on

y

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y = 10 m

and has a velocity

v_{2} = 2 ms^{- 1}

in positive

x

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Topic:

Motion in Straight Line

Book:

Physics for JEE Main and Advanced Mechanics 1 (McGraw Hill)

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Question 4

NEET (Level-II) A liquid does not wet the solid surface if angle of contact is [NEET-2020 (Phase-2)]

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Question Text	One body moves on another moving body Wedge A is moving with acceleration a as shown in figure. Find acceleration of block B w.r.t. : (i) Wedge A
Topic	Mechanics
Subject	Physics
Class	Class 11

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