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Undergraduate 1 Questions asked by Filo students

Views: 5,820

The percentage errors in the measurement of mass and speed are

2%

3%

respectively. How much will be the maximum error in the estimate of kinetic energy obtained by measuring mass and speed? [NCERT]

Topic:

Atoms, Nuclei & Dual nature

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Views: 5,229

{"THERMAL PROPERTIES OF MLATTER","11.1 INTRODUCTION","We all have common sense notions of heat and ten Temperature is a measure of hotness of a body with boiling water is hotter than a box contain physics, we need to define the notion of heat, ter etc., more carefully. In this chapter, you will leary is and how it is measured, and study the various which heat flows from one body to another. Alo you will find out why blacksmiths heat the iron fitting on the rim of a wooden wheel of a horse goes down. You will also learn what happens whe or freezes, and its temperature does not change processes even though a great deal of heat is fl out of it.","11.2 TEMPERATURE AND HEAT"}

Topic:

Heat & Thermodynamics

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Views: 5,730

Velocity : The rate of change of position i.e. rate of displacement with time is called velocity.

It is a vector quantity having symbol $v ec v$ .
Dimension: $l e f t [M^{0} L^{1} T^{- 1} i g h t]$
Unit : metre/second (S.I.), \mathrm{cm} / \mathrm{\second} (C.G.S.)
Types of velocity:

Topic:

Mechanics

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Views: 5,682

Q.43 A uniform thin rod of mass

m

L

is held hori2ontally by two vertical strings attached to the two ends. One of the string is cut. Find the angular acceleration soon after it is cut

$g /2 L$
$g / L$
$3 g /2 L$

Topic:

Mechanics

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Views: 5,333

g / L

2 g / L

Q.44 Thez-component of angular momentum in terms of linear momentum will be-

$J_{z} = xp_{y} - yp_{x}$
$J_{z} = yp_{y} - xp_{x}$

Topic:

Mechanics

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Views: 5,006

Q.6.3 A solid sphere and a solid cylinder having the same mass and radius, roll down the same incline. The ratio of their acceleration will be -

$15 : 14$
$14 : 15$
$5 : 3$
$3 : 5$

Topic:

Mechanics

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Views: 5,138

Q.64 When a ring of moment of inertia I rolls down on an inclined plane, then the percentage of its rotational kinetic energy in total energy is -

$100%$
$50%$
$28%$
$72%$

Topic:

Mechanics

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Views: 5,937

egin{array}{ll} ext { (C) } \frac{\mathrm{I} \omega-\mathrm{mvr}}{\mathrm{I}+\mathrm{mr}^{2}} & ext { (D) } \frac{\mathrm{I} \omega-\mathrm{mvr}}{\mathrm{I}}end{array} Q.51 A smooth tube of certain mass is rotated in gravity free space and released. The two balls shown in the figure move towards ends of the tube. For the whole system which of the following quantity is not conserved -

Angular momentum
Linear momentum
Kinetic energy
Angular speed

Topic:

Mechanics

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Views: 5,993

finertia about it is ecord and falls passing through its centre. The star undergoes an internal explosion and converts to a neutron star. Initial radius of the core was

1.0 \times 1 0^{4} km

, whereas final radius is

3.0 km

. Determine the period of rotation of the neutron star.

$2.7 \times 1 0^{- 6}$ days
$1.7 \times 1 0^{- 6}$ days
$4.1 \times 1 0^{- 6}$ days
$5.2 \times 1 0^{- 6}$ days

Topic:

Mechanics

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Question 10

Views: 5,750

lower end locat eparticle about 0

$\frac{2 m g h}{1 + 2 m}$

Topic:

Mechanics

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Question 11

Views: 5,187

PART - 7 : ROTATIONALKINETIC ENERGY of the upper el is AND WORKENERGY THEOREM its ends and is rotated at f rotations per second. The rotational kinetic energy of the rod will be-

$(2/3) π^{2} f^{2} m e l l^{2}$
$(4/3) f^{2} m e l l^{2}$
$4 π^{2} f^{2} m e l l^{2}$
0

Topic:

Mechanics

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Question 12

Views: 5,380

A bullet of mas

m

v_{0}

. It hits a block of mass M and gets stuck in it. Find maximum angle of deviated by the system.

Topic:

Mechanics

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Question 13

Views: 5,544

9. A sample of a radioactive nucleus A disintegrates to another radioactive nucleus B, which in turn disintegrates to some other stable nucleus C. Plot of a graph showing the variation of number of atoms of nucleus

B

vesus time is: (Assume that at

t = 0

B

atoms in the sample)

3 1^{s t}

Topic:

Atoms, Nuclei & Dual nature

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Question 14

Views: 5,345

Q5 (25 July 2021 Shif 1) A particle of mass

4 M

at reit distntegrates into two particles of mass M and 3M respectively having non zero velocities. The ratio of de-Broglic wavelength of particle of mass M to that of mass

3 M

$1 : 3$
$3 : 1$
$1 : 3$
$1 : 1$

Topic:

Atoms, Nuclei & Dual nature

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Question 15

Views: 5,157

SHAHEEN GROUP OF INSTITUTIONS SHAHER Bidar (Head office) Class:1PUFTBSTAR \& NEET + THEORY Sub: PCB Version - 5 Marks: 720 Date: 07- Name: Admission NO IMPORTANT JNSTRUCTLONS I. Use of Electronic / Manual Calculator is prohubited 2. The candidates are govemed by all Rules and Regulations of the examination with regard to their cond the Examination Hall All cases of unfair means will be dealt with as per Rules and Regulations of this exami 1. A stationary wheel starts rotating about its own axis at uniform angular acceleration

8 rad / s^{2}

. The time taken by it to complete 77 rotations is

$5.5 sec$
$7 sec$
$11 sec$
$14 sec$

Topic:

Mechanics

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Question 16

Views: 5,846

The ratio of moments of inertia of two solid spheres of same mass but densities in the ratio

1.8

$1 = 4$
$4.1$
$2 : 1$
$8 : 1$

Topic:

Mechanics

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Question 17

Views: 5,180

The radius of gyration of a body is

18 cm

when it is rotating about an axis passing through cent: imass of body If radius of gyration of same body is

30 cm

about a parallel axis to first axis then. pcrpendicular distance between two parallel axes is

$12 cm$
$16 cm$
$24 cm$
$36 cm$

Topic:

Mechanics

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Question 18

Views: 5,396

The diameter of a dise is Im. It has a mass of

20 kg

. It is rotating about its axis with a speed of 120 rotations in one minute. Its angular momertum in

kg

^{2} / s

$13.4$
31,4
$41.4$
$43.4$

Topic:

Mechanics

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Question 19

Views: 5,511

A ballet dancer is rotating at angular velocity won smooth horizontal floor. The ballet dancer fo body close to his axis of rotation by which his radius of gyration decreases by

1/ 4^{bh}

of his initial of gyration, his final angular velocity is

3 tw/4
$9 n / A$
$9 c / lb$
$16 n /9$

Topic:

Mechanics

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Question 20

Views: 6,036

A mass is whirled in a circular path with an angular momentum L. If the Icngth of string and an velocity, both are doubled, the new angular momentum is

$L$
41
81
$16 L$

Topic:

Mechanics

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