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Question Number 22456 Answers: 1 Comments: 0

A long plank begins to move at t = 0 and accelerates along a straight track with a speed given by v = 2t^2 for 0 ≤ t ≤ 2. After 2 s, the plank continues to move at the constant speed acquired. A small block initially at rest on the plank begins to slip at t = 1 s and stops sliding at t = 3 s. Find the coefficient of static and kinetic friction between the block and the plank.

$A long plank begins to move at t = 0$ $and accelerates along a straight track$ $with a speed given by v = 2 t^{2} for 0 ⩽ t$ $⩽ 2 . After 2 s, the plank continues to$ $move at the constant speed acquired .$ $A small block initially at rest on the$ $plank begins to slip at t = 1 s and stops$ $sliding at t = 3 s . Find the coefficient of$ $static and kinetic friction between the$ $block and the plank .$

Question Number 22447 Answers: 1 Comments: 0

The standard heats of formation of at 298 K for CCl_4 (g), H_2 O(g), CO_2 (g) and HCl(g) are −25.5, −57.8, −94.1 and −22.1 kcal mol^(−1) respectively. Calculate Δ_r H^⊝ for the reaction CCl_4 (g) + 2H_2 O(g) → CO_2 (g) + 4HCl(g)

$The standard heats of formation of at$ $298 K for {CCl}_{4} (g), H_{2} O (g), {CO}_{2} (g) and$ $HCl (g) are - 25.5, - 57.8, - 94.1 and$ $- 22.1 kcal {mol}^{- 1} respectively . Calculate$ $Δ_{r} H^{⊝} for the reaction$ ${CCl}_{4} (g) + {2 H}_{2} O (g) \to {CO}_{2} (g) + 4 HCl (g)$

Question Number 22446 Answers: 0 Comments: 0

Select the species which has the smallest radius stating appropriate reason. K^+ , Sr^(2+) , Ar

$Select the species which has the smallest$ $radius stating appropriate reason .$ $K^{+}, {Sr}^{2 +}, Ar$

Question Number 22437 Answers: 0 Comments: 11

A cubical block is held stationary against a rough wall by applying force ′F′ then incorrect statement among the following is (1) frictional force, f = Mg (2) f = N, N is normal reaction (3) F does not apply any torque (4) N does not apply any torque

$A cubical block is held stationary$ $against a rough wall by applying force$ $^{'} F^{'} then i n c o r r e c t statement among$ $the following is$ $(1) frictional force, f = Mg$ $(2) f = N, N is normal reaction$ $(3) F does not apply any torque$ $(4) N does not apply any torque$

Question Number 22395 Answers: 0 Comments: 2

Question Number 22370 Answers: 1 Comments: 3

A uniform flexible chain of length (3/2) m rests on a fixed smooth sphere of radius R = (2/π) m such that one end A of chain is on the top of the sphere while the other end B is hanging freely. Chain is held stationary by a horizontal thread PA. Calculate the acceleration of chain when the horizontal string PA is burnt. (g = 10 m/s^2 )

$A uniform flexible chain of length \frac{3}{2} m$ $rests on a fixed smooth sphere of$ $radius R = \frac{2}{π} m such that one end A of$ $chain is on the top of the sphere while$ $the other end B is hanging freely . Chain$ $is held stationary by a horizontal$ $thread P A . Calculate the acceleration$ $of chain when the horizontal string P A$ $is burnt . (g = 10 m / s^{2})$

Question Number 22368 Answers: 0 Comments: 0

The first and second ionization potentials of helium atoms are 24.58 eV and 54.4 eV per mole respectively. Calculate the energy in kJ required to produce 1 mole of He^(2+) ions.

$The first and second ionization$ $potentials of helium atoms are 24.58 eV$ $and 54.4 eV per mole respectively .$ $Calculate the energy in kJ required to$ $produce 1 mole of {He}^{2 +} ions .$

Question Number 22325 Answers: 0 Comments: 0

If separate samples of argon, methane, nitrogen and carbon dioxide, all at the same initial temperature and pressure and expanded adiabatically reversibally to double their original volumes, then which one of these gases will have high temperature as final temperature?

$If separate samples of argon, methane,$ $nitrogen and carbon dioxide, all at the$ $same initial temperature and pressure$ $and expanded adiabatically reversibally$ $to double their original volumes, then$ $which one of these gases will have high$ $temperature as final temperature ?$

Question Number 22319 Answers: 1 Comments: 8

A string of negligible mass going over a clamped pulley of mass m supports a block of mass M. The force on the pulley by the clamp is given by

$A string of negligible mass going over a$ $clamped pulley of mass m supports a$ $block of mass M . The force on the$ $pulley by the clamp is given by$

Question Number 22304 Answers: 1 Comments: 0

A particle moves in a straight line along x-axis. At t = 0, it is released from rest at x = a. Acceleration of the particle varies as (d^2 x/dt^2 ) = −(k/x^2 ) , where k is a positive constant. Time required by particle to reach the origin will be

$A particle moves in a straight line along$ $x - axis . At t = 0, it is released from$ $rest at x = a . Acceleration of the$ $particle varies as \frac{d^{2} x}{{d t}^{2}} = - \frac{k}{x^{2}}, where k$ $is a positive constant .$ $Time required by particle to reach the$ $origin will be$

Question Number 22302 Answers: 1 Comments: 0

A small bead of mass m is given an initial velocity of magnitude v_0 on a horizontal circular wire. If the coefficient of kinetic friction is μ_k , the determine the distance travelled before the collar comes to rest. (Given that radius of circular wire is R).

$A small bead of mass m is given an$ $initial velocity of magnitude v_{0} on a$ $horizontal circular wire . If the$ $coefficient of kinetic friction is μ_{k}, the$ $determine the distance travelled before$ $the collar comes to rest . (Given that$ $radius of circular wire is R) .$

Question Number 22286 Answers: 1 Comments: 5

A wire, which passes through the hole in a small bead, is bent in the form of quarter of a circle. The wire is fixed vertically on ground. The bead is released from near the top of the wire and it slides along the wire without friction. As the bead moves from A to B, the force it applies on the wire B is (a) always radially outwards (b) always radially inwards (c) radially outwards initially and radially inwards later (d) radially inwards initially and radially outwards later.

$A wire, which passes through the hole$ $in a small bead, is bent in the form of$ $quarter of a circle . The wire is fixed$ $vertically on ground . The bead is$ $released from near the top of the wire$ $and it slides along the wire without$ $friction . As the bead moves from A to B,$ $the force it applies on the wire B is$ $(a) always radially outwards$ $(b) always radially inwards$ $(c) radially outwards initially and$ $radially inwards later$ $(d) radially inwards initially and$ $radially outwards later .$

Question Number 22299 Answers: 0 Comments: 0

If a certain mass of gas is made to undergo separately adiabatic and isothermal expansions to the same pressure, starting from the same initial conditions of temperature and pressure, then as compared to that of isothermal expansion, in the case of adiabatic expansion, the final (1) Volume and temperature will be higher (2) Volume and temperature will be lower (3) Temperature will be lower but the final volume will be higher (4) Volume will be lower but the final temperature will be higher

$If a certain mass of gas is made to$ $undergo separately adiabatic and$ $isothermal expansions to the same$ $pressure, starting from the same initial$ $conditions of temperature and pressure,$ $then as compared to that of isothermal$ $expansion, in the case of adiabatic$ $expansion, the final$ $(1) Volume and temperature will be$ $higher$ $(2) Volume and temperature will be$ $lower$ $(3) Temperature will be lower but the$ $final volume will be higher$ $(4) Volume will be lower but the final$ $temperature will be higher$

Question Number 22145 Answers: 1 Comments: 3

A particle P is moving on a circle under the action of only one force acting always towards fixed point O on the circumference. Find ratio of (d^2 φ/dt^2 ) and ((dφ/dt))^2 .

$A particle P is moving on a circle under$ $the action of only one force acting$ $always towards fixed point O on the$ $circumference . Find ratio of \frac{d^{2} ϕ}{{d t}^{2}} and$ ${(\frac{d ϕ}{d t})}^{2} .$

Question Number 22139 Answers: 0 Comments: 3

The linear mass density, i.e. mass per unit length of the rope, varies from 0 to λ from one end to another. The acceleration of the combined system will be

$The linear mass density, i . e . mass per$ $unit length of the rope, varies from 0 to$ $λ from one end to another . The$ $acceleration of the combined system$ $will be$

Question Number 22138 Answers: 0 Comments: 0

In the ground state, an element has 13 electrons in its M-shell. The element is

$In the ground state, an element has 13$ $electrons in its M - shell . The element is$

Question Number 22135 Answers: 1 Comments: 0

A mass m hangs with the help of a string wrapped around a pulley on a frictionless bearing. The pulley has mass m and radius R. Assuming pulley to be a perfect uniform circular disc, the acceleration of the mass m, if the string does not slip on the pulley, is

$A mass m hangs with the help of a$ $string wrapped around a pulley on a$ $frictionless bearing . The pulley has$ $mass m and radius R . Assuming pulley$ $to be a perfect uniform circular disc, the$ $acceleration of the mass m, if the$ $string does not slip on the pulley, is$

Question Number 22251 Answers: 1 Comments: 0

Reversible melting of solid benzene at 1 atm and normal melting point correspond to (1) q > 0 (2) w < 0 (3) ΔE > 0 (4) All of these

$Reversible melting of solid benzene at$ $1 atm and normal melting point$ $correspond to$ $(1) q > 0$ $(2) w < 0$ $(3) Δ E > 0$ $(4) All of these$

Question Number 22295 Answers: 1 Comments: 0

The ionization potential of hydrogen is 13.6 eV/mole. Calculate the energy in kJ required to produce 0.1 mole of H^+ ions. Given, 1 eV = 96.49 kJ mol^(−1) )

$The ionization potential of hydrogen is$ $13.6 eV / mole . Calculate the energy in$ $kJ required to produce 0.1 mole of H^{+}$ $ions . Given, 1 eV = 96.49 kJ {mol}^{- 1})$

Question Number 22071 Answers: 1 Comments: 4

STATEMENT-1 : If an object is at rest then there should not be any friction on it. STATEMENT-2 : If an object is moving then the friction acting on it has to be kinetic. STATEMENT-3 : If an object is at rest then kinetic friction cannot act on it.

$STATEMENT - 1 : If an object is at$ $rest then there should not be any friction$ $on it .$ $STATEMENT - 2 : If an object is moving$ $then the friction acting on it has to be$ $kinetic .$ $STATEMENT - 3 : If an object is at rest$ $then kinetic friction cannot act on it .$

Question Number 22059 Answers: 1 Comments: 0

A flywheel whose diameter is 1.5m decrease uniformly from 240rad/min until it came to rest 10s. Find the number of revolution made.

$A flywheel whose diameter is 1 . 5 m decrease uniformly from 240 rad / \min$ $until it came to rest 10 s . Find the number of revolution made .$

Question Number 22058 Answers: 1 Comments: 0

Two balls of mass 500g and 750g moving with 15m/s and 10m/s towards each other collides. Find the velocities of the ball after collision, if the coefficient of restitution is 0.8

$Two balls of mass 500 g and 750 g moving with 15 m / s and$ $10 m / s towards each other collides . Find the velocities of the ball after$ $collision, if the coefficient of restitution is 0.8$

Question Number 22052 Answers: 0 Comments: 2

A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is (a) frictional force along westward (b) muscle force along southward (c) frictional force along south-west (d) muscle force along south-west

$A hockey player is moving northward$ $and suddenly turns westward with$ $the same speed to avoid an opponent .$ $The force that acts on the player is$ $(a) frictional force along westward$ $(b) muscle force along southward$ $(c) frictional force along south - west$ $(d) muscle force along south - west$

Question Number 22050 Answers: 0 Comments: 0

Calculate the energy emitted when electrons of 1 g atom of hydrogen undergo transition giving the spectral line of lowest energy in the visible region of its atomic spectrum (R_H = 1.1 × 10^7 m^(−1) , c = 3 × 10^8 ms^(−1) , h = 6.62 × 10^(−34) Js)

$Calculate the energy emitted when$ $electrons of 1 g atom of hydrogen$ $undergo transition giving the spectral$ $line of lowest energy in the visible$ $region of its atomic spectrum$ $(R_{H} = 1.1 \times 10^{7} m^{- 1}, c = 3 \times 10^{8} {m s}^{- 1},$ $h = 6.62 \times 10^{- 34} Js)$

Question Number 22020 Answers: 0 Comments: 0

The line of action of the resultant of two like parallel forces shifts by one fourth of the distance between the forces when the two forces are interchanged. The ratio of the two forces is

$The line of action of the resultant of$ $two like parallel forces shifts by one$ $fourth of the distance between the$ $forces when the two forces are$ $interchanged . The ratio of the two$ $forces is$

Question Number 21967 Answers: 1 Comments: 1

A block is tied with a thread of length l and moved in a horizontal circle on a rough table. Coefficient of friction between block and table is μ = 0.2. Find tan θ, where θ is the angle between acceleration and frictional force at the instant when speed of particle is v = (√(1.6lg))

$A block is tied with a thread of length l$ $and moved in a horizontal circle on a$ $rough table . Coefficient of friction$ $between block and table is μ = 0.2 .$ $Find \tan θ, where θ is the angle$ $between acceleration and frictional$ $force at the instant when speed of$ $particle is v = \sqrt{1.6 l g}$

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