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Question Number 19140 Answers: 0 Comments: 9

A racing car travels on a track (without banking) ABCDEFA. ABC is a circular arc of radius 2R. CD and FA are straight paths of length R and DEF is a circular arc of radius R = 100 m. The co-efficient of friction on the road is μ = 0.1. The maximum speed of the car is 50 ms^(−1) . Find the minimum time for completing one round.

$A racing car travels on a track (without$ $banking) A B C D E F A . A B C is a circular$ $arc of radius 2 R . C D and F A are$ $straight paths of length R and D E F is$ $a circular arc of radius R = 100 m . The$ $co - efficient of friction on the road is μ =$ $0.1 . The maximum speed of the car is$ $50 {ms}^{- 1} . Find the minimum time for$ $completing one round .$

Question Number 19137 Answers: 1 Comments: 1

Figure shows (x, t), (y, t) diagram of a particle moving in 2-dimensions. If the particle has a mass of 500 g, find the force (direction and magnitude) acting on the particle.

$Figure shows (x, t), (y, t) diagram of a$ $particle moving in 2 - dimensions . If the$ $particle has a mass of 500 g, find the$ $force (direction and magnitude) acting$ $on the particle .$

Question Number 18965 Answers: 1 Comments: 3

Two blocks of masses M and 2M are connected to each other through a light spring as shown in figure. If we push the mass M with a force F which cause acceleration a in mass M, what will the acceleration in 2M?

$Two blocks of masses M and 2 M are$ $connected to each other through a light$ $spring as shown in figure . If we push the$ $mass M with a force F which cause$ $acceleration a in mass M, what will the$ $acceleration in 2 M ?$

Question Number 18963 Answers: 0 Comments: 4

Two blocks A and B each of mass 1 kg are placed on a smooth horizontal surface. Two horizontal forces 5 N and 10 N are applied on the blocks A and B respectively as shown in figure. The block A does not slide on block B. Then the normal reaction between the two block is

$Two blocks A and B each of mass 1 kg$ $are placed on a smooth horizontal$ $surface . Two horizontal forces 5 N and$ $10 N are applied on the blocks A and B$ $respectively as shown in figure . The$ $block A does not slide on block B . Then$ $the normal reaction between the two$ $block is$

Question Number 18951 Answers: 0 Comments: 0

Question Number 18924 Answers: 1 Comments: 0

A spring of force constant k is cut into two pieces such that one piece is twice as long as the other. Then the longer piece will have a force constant of

$A spring of force constant k is cut into$ $two pieces such that one piece is twice$ $as long as the other . Then the longer$ $piece will have a force constant of$

Question Number 18922 Answers: 0 Comments: 3

Consider a block sliding over a smooth inclined surface of inclination θ. Relating to Newton′s second law applied on the block, select the incorrect alternative. (1) ΣF_(y′) ≠ 0 (2) ΣF_y = 0 (3) ΣF_x = −mg sin θ (4) ΣF_(x′) < 0

$Consider a block sliding over a smooth$ $inclined surface of inclination θ . Relating$ $to {Newton}^{'} s second law applied on the$ $block, select the incorrect alternative .$ $(1) Σ F_{y^{'}} \neq 0$ $(2) Σ F_{y} = 0$ $(3) Σ F_{x} = - m g \sin θ$ $(4) Σ F_{x^{'}} < 0$

Question Number 18918 Answers: 0 Comments: 17

A bird sits on a stretched telegraph wire. The additional tension produced in the wire is (1) Zero (2) Greater than weight of the bird (3) Less than the weight of the bird (4) Equal to the weight of the bird

$A bird sits on a stretched telegraph$ $wire . The additional tension produced$ $in the wire is$ $(1) Zero$ $(2) Greater than weight of the bird$ $(3) Less than the weight of the bird$ $(4) Equal to the weight of the bird$

Question Number 18940 Answers: 0 Comments: 3

A light rope is passed over a pulley such that at its one end a block is attached, and on the other end a boy is climbing up with acceleration (g/2) relative to rope. Mass of the block is 30 kg and that of the boy is 40 kg. Find the tension and acceleration of the rope.

$A light rope is passed over a pulley such$ $that at its one end a block is attached,$ $and on the other end a boy is climbing$ $up with acceleration \frac{g}{2} relative to rope .$ $Mass of the block is 30 kg and that of$ $the boy is 40 kg . Find the tension and$ $acceleration of the rope .$

Question Number 18871 Answers: 0 Comments: 1

Question Number 18846 Answers: 0 Comments: 0

There are two crystalline forms of PbO ; one is yellow and the other is red. The standard enthalpies of formation of these two forms are −217.3 and −219 kJ per mole respectively. Calculate the enthalpy change for the solid-solid phase transition. PbO (yellow) → PbO (red)

$There are two crystalline forms of PbO;$ $one is yellow and the other is red . The$ $standard enthalpies of formation of$ $these two forms are - 217.3 and - 219$ $kJ per mole respectively . Calculate the$ $enthalpy change for the solid - solid$ $phase transition .$ $PbO (yellow) \to PbO (red)$

Question Number 18886 Answers: 0 Comments: 0

Question Number 18851 Answers: 0 Comments: 0

Question Number 18763 Answers: 0 Comments: 3

Question Number 18749 Answers: 1 Comments: 1

Motion in two dimensions, in a plane can be studied by expressing position, velocity and acceleration as vectors in Cartesian co-ordinates A^→ = A_x i^∧ + A_y j^∧ where i^∧ and j^∧ are unit vector along x and y directions, respectively and A_x and A_y are corresponding components of A^→ (Figure). Motion can also be studied by expressing vectors in circular polar co-ordinates as A^→ = A_r r^∧ + A_θ θ^∧ where r^∧ = (r^→ /r) = cos θ i^∧ + sin θ j^∧ and θ^∧ = −sin θ i^∧ + cos θ j^∧ are unit vectors along direction in which ′r′ and ′θ′ are increasing. (a) Express i^∧ and j^∧ in terms of r^∧ and θ^∧ (b) Show that both r^∧ and θ^∧ are unit vectors and are perpendicular to each other. (c) Show that (d/dt)(r^∧ ) = ωθ^∧ where ω = (dθ/dt) and (d/dt)(θ^∧ ) = −ωr^∧ (d) For a particle moving along a spiral given by r^→ = αθr^∧ , where α = 1 (unit), find dimensions of ′α′. (e) Find velocity and acceleration in polar vector representation for particle moving along spiral described in (d) above.

$Motion in two dimensions, in a plane$ $can be studied by expressing position,$ $velocity and acceleration as vectors in$ $Cartesian co - ordinates \vec{A} = A_{x} \overset{\land}{i} + A_{y} \overset{\land}{j}$ $where \overset{\land}{i} and \overset{\land}{j} are unit vector along x$ $and y directions, respectively and A_{x}$ $and A_{y} are corresponding components$ $of \vec{A} (Figure) . Motion can also be$ $studied by expressing vectors in circular$ $polar co - ordinates as \vec{A} = A_{r} \overset{\land}{r} + A_{θ} \overset{\land}{θ}$ $where \overset{\land}{r} = \frac{\vec{r}}{r} = \cos θ \overset{\land}{i} + \sin θ \overset{\land}{j} and \overset{\land}{θ} =$ $- \sin θ \overset{\land}{i} + \cos θ \overset{\land}{j} are unit vectors along$ $direction in which^{'} r^{'} and^{'} θ^{'} are$ $increasing .$ $(a) Express \overset{\land}{i} and \overset{\land}{j} in terms of \overset{\land}{r} and \overset{\land}{θ}$ $(b) Show that both \overset{\land}{r} and \overset{\land}{θ} are unit$ $vectors and are perpendicular to each$ $other .$ $(c) Show that \frac{d}{d t} (\overset{\land}{r}) = ω \overset{\land}{θ} where$ $ω = \frac{d θ}{d t} and \frac{d}{d t} (\overset{\land}{θ}) = - ω \overset{\land}{r}$ $(d) For a particle moving along a spiral$ $given by \vec{r} = α θ \overset{\land}{r}, where α = 1 (unit),$ $find dimensions of^{'} α^{'} .$ $(e) Find velocity and acceleration in$ $polar vector representation for particle$ $moving along spiral described in (d)$ $above .$

Question Number 18666 Answers: 1 Comments: 0

An elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. what is the Original length of the string ?

$An elastic material has a length of 36 cm when a load of 40 N is hung on it and$ $a length of 45 cm when a load of 60 N is hung on it . what is the Original$ $length of the string ?$

Question Number 18645 Answers: 0 Comments: 0

Question Number 18624 Answers: 1 Comments: 0

Argon diffuses through a hole under prescribed condition of temperature and pressure at the rate of 3cm^3 per velocity. At what velocity will helium diffuse through the same hole under the same condition (Ar = 29.94 g, He = 4g).

$Argon diffuses through a hole under prescribed condition of temperature$ $and pressure at the rate of {3 cm}^{3} per velocity . At what velocity will helium$ $diffuse through the same hole under the same condition$ $(Ar = 29.94 g, He = 4 g) .$

Question Number 18614 Answers: 0 Comments: 1

Question Number 18607 Answers: 1 Comments: 1

A block of mass M is pulled vertically upward through a rope of mass m by applying force F on-one end of the rope. What force does the rope exert on the block?

$A block of mass M is pulled vertically$ $upward through a rope of mass m by$ $applying force F on - one end of the rope .$ $What force does the rope exert on the$ $block ?$

Question Number 18603 Answers: 0 Comments: 0

The work function of a metal is 4 eV. If light of frequency 2.3 × 10^(15) Hz is incident on metal surface, then, (1) No photoelectron will be ejected (2) 2 photoelectron of zero kinetic energy are ejected (3) 1 photoelectron of zero kinetic energy is ejected (4) 1 photoelectron is ejected, which required the stopping potential of 5.52 volt

$The work function of a metal is 4 eV . If$ $light of frequency 2.3 \times 10^{15} Hz is$ $incident on metal surface, then,$ $(1) No photoelectron will be ejected$ $(2) 2 photoelectron of zero kinetic$ $energy are ejected$ $(3) 1 photoelectron of zero kinetic$ $energy is ejected$ $(4) 1 photoelectron is ejected, which$ $required the stopping potential of 5.52$ $volt$

Question Number 18568 Answers: 0 Comments: 0

The energy required to dislodge electron from excited isolated H-atom, IE_1 = 13.6 eV is (1) = 13.6 eV (2) > 13.6 eV (3) < 13.6 eV and > 3.4 eV (4) ≤ 3.4 eV

$The energy required to dislodge electron$ $from excited isolated H - atom, {IE}_{1} =$ $13.6 eV is$ $(1) = 13.6 eV$ $(2) > 13.6 eV$ $(3) < 13.6 eV and > 3.4 eV$ $(4) ⩽ 3.4 eV$

Question Number 18581 Answers: 1 Comments: 0

In moving a body of mass m up and down a rough incline plane of inclination θ, work done is (S is length of the planck, and μ is coefficient of friction).

$In moving a body of mass m up and$ $down a rough incline plane of inclination$ $θ, work done is (S is length of the planck,$ $and μ is coefficient of friction) .$

Question Number 18561 Answers: 0 Comments: 2

The acceleration of an object is given by a(t) = cos(nπ), and its velocity at time t = 0 is (1/(2π)). Find both the net and the total distance traveled in the first 1.5 seconds.

$The acceleration of an object is given by a (t) = \cos (n π), and its velocity$ $at time t = 0 is \frac{1}{2 π} . Find both the net and the total distance traveled in the$ $first 1.5 seconds .$

Question Number 18549 Answers: 0 Comments: 0

A particle of mass 1 gram executes an oscillatory motion on the concave surface of a spherical dish of radius 2 m, placed on a horizontal plane. If the motion of the particle starts from a point on the dish at the height of 1 cm from the horizontal plane and the coefficient of friction is 0.01, how much total distance will be moved by the particle before it comes to rest?

$A particle of mass 1 gram executes an$ $oscillatory motion on the concave$ $surface of a spherical dish of radius 2 m,$ $placed on a horizontal plane . If the$ $motion of the particle starts from a$ $point on the dish at the height of 1 cm$ $from the horizontal plane and the$ $coefficient of friction is 0.01, how much$ $total distance will be moved by the$ $particle before it comes to rest ?$

Question Number 18530 Answers: 1 Comments: 0

In an atom the last electron is present in f-orbital and for its outermost shell the graph of Ψ^2 has 6 maximas. What is the sum of group and period of that element?

$In an atom the last electron is present$ $in f - orbital and for its outermost shell$ $the graph of Ψ^{2} has 6 maximas . What$ $is the sum of group and period of that$ $element ?$

Pg 131 Pg 132 Pg 133 Pg 134 Pg 135 Pg 136 Pg 137 Pg 138 Pg 139 Pg 140

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