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Question Number 21713 Answers: 0 Comments: 7

A constant force F = 20 N acts on a block of mass 2 kg which is connected to two blocks of masses m_1 = 1 kg and m_2 = 2 kg. Calculate the accelerations produced in all the three blocks. Assume pulleys are frictionless and weightless.

$A constant force F = 20 N acts on a$ $block of mass 2 kg which is connected to$ $two blocks of masses m_{1} = 1 kg and$ $m_{2} = 2 kg . Calculate the accelerations$ $produced in all the three blocks . Assume$ $pulleys are frictionless and weightless .$

Question Number 21670 Answers: 1 Comments: 1

The block of mass 2 kg and 3 kg are placed one over the other. The contact surfaces are rough with coefficient of friction μ_1 = 0.2, μ_2 = 0.06. A force F = (1/2)t N (where t is in second) is applied on upper block in the direction. (Given that g = 10 m/s^2 ) 1. The relative slipping between the blocks occurs at t = 2. Friction force acting between the two blocks at t = 8 s 3. The acceleration time graph for 3 kg block is

$The block of mass 2 kg and 3 kg are$ $placed one over the other . The contact$ $surfaces are rough with coefficient of$ $friction μ_{1} = 0.2, μ_{2} = 0.06 . A force F =$ $\frac{1}{2} t N (where t is in second) is applied$ $on upper block in the direction . (Given$ $that g = 10 m / s^{2})$ $1 . The relative slipping between the$ $blocks occurs at t =$ $2 . Friction force acting between the two$ $blocks at t = 8 s$ $3 . The acceleration time graph for 3 kg$ $block is$

Question Number 21661 Answers: 0 Comments: 2

Question Number 21628 Answers: 1 Comments: 0

One end of a massless spring of constant 100 N/m and natural length 0.5 m is fixed and the other end is connected to a particle of mass 0.5 kg lying on a frictionless horizontal table. The spring remains horizontal. If the mass is made to rotate at an angular velocity of 2 rad/s, find the elongation of the spring.

$One end of a massless spring of constant$ $100 N / m and natural length 0.5 m is$ $fixed and the other end is connected to$ $a particle of mass 0.5 kg lying on a$ $frictionless horizontal table . The spring$ $remains horizontal . If the mass is made$ $to rotate at an angular velocity of 2$ $rad / s, find the elongation of the spring .$

Question Number 21626 Answers: 0 Comments: 1

Is it also possible to import text or fomulars from other apps using the android−clipboard?

$Is it also possible to import text or fomulars$ $from other apps using the android - clipboard ?$

Question Number 21604 Answers: 1 Comments: 0

A particle will leave a vertical circle of radius r, when its velocity at the lowest point of the circle (v_L ) is (a) (√(2gr)) (b) (√(5gr)) (c) (√(3gr)) (d) (√(6gr))

$A particle will leave a vertical circle of$ $radius r, when its velocity at the lowest$ $point of the circle (v_{L}) is$ $(a) \sqrt{2 g r}$ $(b) \sqrt{5 g r}$ $(c) \sqrt{3 g r}$ $(d) \sqrt{6 g r}$

Question Number 21580 Answers: 1 Comments: 0

Question Number 21564 Answers: 0 Comments: 1

A block of mass M is placed on smooth ground. Its upper surface is smooth and vertical surface is rough with coefficient of friction μ. A block of mass m_1 is placed on its horizontal surface and tied with a massless inextensible string passing over smooth pulley. Its other end is connected to another block of mass m_2 , which touches the vertical surface of block M. Now a horizontal force F starts acting on it. Q1. Which of the following is incorrect about above system? (1) There exists a value of F at which friction force is equal to zero (2) When F = 0, the blocks cannot remain stationary (3) There exists two limiting values of F at which the blocks m_1 and m_2 will remain stationary w.r.t. block of mass M (4) The limiting friction between m_2 and M is independent of F Q2. In the above case, let m_1 − μm_2 be greater than 1. Choose the incorrect value of F for which the blocks m_1 and m_2 remain stationary with respect to M (1) (M + m_1 + m_2 )((m_2 g)/m_1 ) (2) ((m_2 (M + m_1 + m_2 ))/((m_1 − μm_2 )))g (3) (((M + m_1 + m_2 )m_2 g)/((m_1 + μm_2 ))) (4) (M + m_1 + m_2 )(g/μ) Q3. Let vertical part of block M be smooth. Choose the correct alternative (1) There exist two limiting values for system to remain relatively at rest (2) For one unique value of F, the blocks m_1 and m_2 remain stationary with respect to block M (3) The blocks m_1 and m_2 cannot be in equilibrium for any value of F (4) There exists a range of mass M, for which system remains stationary

$A block of mass M is placed on smooth$ $ground . Its upper surface is smooth and$ $vertical surface is rough with coefficient$ $of friction μ . A block of mass m_{1} is placed$ $on its horizontal surface and tied with$ $a massless inextensible string passing$ $over smooth pulley . Its other end is$ $connected to another block of mass m_{2},$ $which touches the vertical surface of$ $block M . Now a horizontal force F$ $starts acting on it .$ $Q 1 . Which of the following is incorrect$ $about above system ?$ $(1) There exists a value of F at which$ $friction force is equal to zero$ $(2) When F = 0, the blocks cannot$ $remain stationary$ $(3) There exists two limiting values of$ $F at which the blocks m_{1} and m_{2} will$ $remain stationary w . r . t . block of mass$ $M$ $(4) The limiting friction between m_{2}$ $and M is independent of F$ $Q 2 . In the above case, let m_{1} - μ m_{2} be$ $greater than 1 . Choose the incorrect$ $value of F for which the blocks m_{1} and$ $m_{2} remain stationary with respect to$ $M$ $(1) (M + m_{1} + m_{2}) \frac{m_{2} g}{m_{1}}$ $(2) \frac{m_{2} (M + m_{1} + m_{2})}{(m_{1} - μ m_{2})} g$ $(3) \frac{(M + m_{1} + m_{2}) m_{2} g}{(m_{1} + μ m_{2})}$ $(4) (M + m_{1} + m_{2}) \frac{g}{μ}$ $Q 3 . Let vertical part of block M be$ $smooth . Choose the correct alternative$ $(1) There exist two limiting values for$ $system to remain relatively at rest$ $(2) For one unique value of F, the blocks$ $m_{1} and m_{2} remain stationary with$ $respect to block M$ $(3) The blocks m_{1} and m_{2} cannot be in$ $equilibrium for any value of F$ $(4) There exists a range of mass M, for$ $which system remains stationary$

Question Number 21557 Answers: 0 Comments: 0

A man of mass 85 kg stands on a lift of mass 30 kg. When he pulls on the rope, he exerts a force of 400 N on the floor of the lift. Calculate acceleration of the lift. Given g = 10 m/s^2 .

$A man of mass 85 kg stands on a lift of$ $mass 30 kg . When he pulls on the rope,$ $he exerts a force of 400 N on the floor of$ $the lift . Calculate acceleration of the$ $lift . Given g = 10 m / s^{2} .$

Question Number 21545 Answers: 0 Comments: 0

Question Number 21535 Answers: 0 Comments: 0

Which forces of attraction are responsible for liquefaction of H_2 ? (a) Coulombic forces (b) Dipole forces (c) Hydrogen bonding (d) Van der Waal′s forces.

$Which forces of attraction are responsible$ $for liquefaction of H_{2} ?$ $(a) Coulombic forces$ $(b) Dipole forces$ $(c) Hydrogen bonding$ $(d) Van der {Waal}^{'} s forces .$

Question Number 21516 Answers: 2 Comments: 0

A 5-kg body is suspended from a spring- balance, and an identical body is balanced on a pan of a physical balance. If both the balances are kept in an elevator, then what would happen in each case when the elevator is moving with an upward acceleration?

$A 5 - kg body is suspended from a spring -$ $balance, and an identical body is$ $balanced on a pan of a physical$ $balance . If both the balances are kept$ $in an elevator, then what would happen$ $in each case when the elevator is moving$ $with an upward acceleration ?$

Question Number 21486 Answers: 0 Comments: 0

Vapour pressure in a closed container can be changed by (1) Adding water vapours from outside at same temperature (2) Adding ice at same temperature (3) Adding water at same temperature (4) Increasing temperature

$Vapour pressure in a closed container$ $can be changed by$ $(1) Adding water vapours from outside$ $at same temperature$ $(2) Adding ice at same temperature$ $(3) Adding water at same temperature$ $(4) Increasing temperature$

Question Number 21484 Answers: 0 Comments: 0

Positive deviation from ideal behaviour takes place because of (a) molecular interaction between atoms and PV/nRT > 1 (b) molecular interaction between atoms and PV/nRT < 1 (c) finite size of the atoms and PV/nRT > 1 (d) finite size of the atoms and PV/nRT < 1

$Positive deviation from ideal behaviour$ $takes place because of$ $(a) molecular interaction between$ $atoms and PV / n RT > 1$ $(b) molecular interaction between$ $atoms and PV / n RT < 1$ $(c) finite size of the atoms and PV / n RT > 1$ $(d) finite size of the atoms and PV / n RT < 1$

Question Number 21482 Answers: 0 Comments: 0

Question Number 21469 Answers: 1 Comments: 1

Three identical blocks, each having a mass M, are pushed by a force F on a frictionless table. What is the net force on the block A?

$Three identical blocks, each having a$ $mass M, are pushed by a force F on a$ $frictionless table . What is the net force$ $on the block A ?$

Question Number 21507 Answers: 1 Comments: 1

The length of an ideal spring increases by 0.1 cm when a body of 1 kg is suspended from it. If this spring is laid on a frictionless horizontal table and bodies of 1 kg each are suspended from its ends, then what will be the increase in its length?

$The length of an ideal spring increases$ $by 0.1 cm when a body of 1 kg is$ $suspended from it . If this spring is laid$ $on a frictionless horizontal table and$ $bodies of 1 kg each are suspended from$ $its ends, then what will be the increase$ $in its length ?$

Question Number 21441 Answers: 1 Comments: 0

Find α in terms of θ using the equations: (i) u^2 sin^2 α = 2gd cos θ (ii) t = ((u cos α)/(g sin θ)) (iii) −d = ut sin α − ((gt^2 sin θ)/2)

$Find α in terms of θ using the equations :$ $(i) u^{2} \sin^{2} α = 2 g d \cos θ$ $(i i) t = \frac{u \cos α}{g \sin θ}$ $(i i i) - d = u t \sin α - \frac{{g t}^{2} \sin θ}{2}$

Question Number 21412 Answers: 0 Comments: 0

The atomic masses of ′He′ and ′Ne′ are 4 and 20 a.m.u., respectively. The value of the de Broglie wavelength of ′He′ gas at −73°C is “M” times that of the de Broglie wavelength of ′Ne′ at 727°C ′M′ is

$The atomic masses of^{'} {He}^{'} and^{'} {Ne}^{'} are$ $4 and 20 a . m . u ., respectively . The$ $value of the de Broglie wavelength of$ $^{'} {He}^{'} gas at - 73 ° C is ‘ ‘ M^{″} times that of$ $the de Broglie wavelength of^{'} {Ne}^{'} at$ $727 ° C^{'} M^{'} is$

Question Number 21411 Answers: 0 Comments: 0

The critical temperature of water is higher than that of O_2 because the H_2 O molecule has (a) fewer electrons than O_2 (b) two covalent bonds (c) V-shape (d) dipole moment.

$The critical temperature of water is$ $higher than that of O_{2} because the$ $H_{2} O molecule has$ $(a) fewer electrons than O_{2}$ $(b) two covalent bonds$ $(c) V - shape$ $(d) dipole moment .$

Question Number 21388 Answers: 0 Comments: 4

A block of mass m is connected with another block of mass 2m by a light spring. 2m is connected with a hanging mass 3m by an inextensible light string. At the time of release of block 3m, find tension in the string and acceleration of all the masses.

$A block of mass m is connected with$ $another block of mass 2 m by a light$ $spring . 2 m is connected with a hanging$ $mass 3 m by an inextensible light string .$ $At the time of release of block 3 m, find$ $tension in the string and acceleration$ $of all the masses .$

Question Number 21377 Answers: 0 Comments: 0

Balls are dropped from the roof of a tower at a fixed interval of time. At the moment when 9th ball reaches the ground the nth ball is (3/4)th height of the tower. What is the value of n?

$Balls are dropped from the roof of a$ $tower at a fixed interval of time . At the$ $moment when 9 th ball reaches the$ $ground the n th ball is (3 / 4) th height$ $of the tower . What is the value of n ?$

Question Number 21295 Answers: 1 Comments: 0

For a particle performing uniform circular motion, angular momentum is constant in magnitude but direction keeps changing. Am I right or wrong?

$For a particle performing uniform$ $circular motion, angular momentum is$ $constant in magnitude but direction$ $keeps changing .$ $Am I right or wrong ?$

Question Number 21282 Answers: 0 Comments: 0

soit (u_n )_(n∈N^∗ ) une suite a termes positifs telle que: ∀n∈N^∗ ,Σ_(k=1) ^n u_k ^3 =(Σ_(k=1) ^n u_k )^2 montrer que ∀n∈N^∗ , u_n =n

$s o i t {(u_{n})}_{n \in N^{*}} u n e s u i t e a t e r m e s p o s i t i f s t e l l e q u e :$ $\forall n \in N^{*}, \underset{k = 1}{\sum^{n}} u_{k}^{3} = {(\underset{k = 1}{\sum^{n}} u_{k})}^{2}$ $m o n t r e r q u e \forall n \in N^{*}, u_{n} = n$

Question Number 21276 Answers: 1 Comments: 0

Question Number 21249 Answers: 0 Comments: 1

A particle slides down a frictionless parabolic (y = x^2 ) track (A − B − C) starting from rest at point A. Point B is at the vertex of parabola and point C is at a height less than that of point A. After C, the particle moves freely in air as a projectile. If the particle reaches highest point at P, then (a) KE at P = KE at B (b) height at P = height at A (c) total energy at P = total energy at A (d) time of travel from A to B = time of travel from B to P.

$A particle slides down a frictionless$ $parabolic (y = x^{2}) track (A - B - C)$ $starting from rest at point A . Point B$ $is at the vertex of parabola and point C$ $is at a height less than that of point A .$ $After C, the particle moves freely in air$ $as a projectile . If the particle reaches$ $highest point at P, then$ $(a) KE at P = KE at B$ $(b) height at P = height at A$ $(c) total energy at P = total energy at$ $A$ $(d) time of travel from A to B = time of$ $travel from B to P .$

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