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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?

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

Question Number 18502 Answers: 1 Comments: 0

The second overtone of a fixed viberating string fixed at both end is 200cm. Find the length of the string.

$The second overtone of a fixed viberating string fixed at both end is 200 cm .$ $Find the length of the string .$

Question Number 18493 Answers: 1 Comments: 1

Draw the free body diagram of following system:

$Draw the free body diagram of following$ $system :$

Question Number 18486 Answers: 0 Comments: 0

Why ionic radii of^(35) Cl <^(37) Cl^− ?

$Why ionic radii of^{35} Cl <^{37} {Cl}^{-} ?$

Question Number 18463 Answers: 1 Comments: 0

The solid angle subtended by a spherical surface of radius R at its centre is (π/2) steradian, then the surface area of corresponding spherical section is

$The solid angle subtended by a spherical$ $surface of radius R at its centre is \frac{π}{2}$ $steradian, then the surface area of$ $corresponding spherical section is$

Question Number 18460 Answers: 1 Comments: 0

Question Number 18440 Answers: 0 Comments: 0

Question Number 18428 Answers: 0 Comments: 0

Question Number 18415 Answers: 1 Comments: 1

Calculate the magnetic field produced at ground level by a 15A current flowing in a long horizontal wire suspended at a height of 7.5m

$Calculate the magnetic field produced at ground level by a 15 A current$ $flowing in a long horizontal wire suspended at a height of 7 . 5 m$

Question Number 18411 Answers: 1 Comments: 0

A glass bulb contains 2.24 L of H_2 and 1.12 L of D_2 at S.T.P. It is connected to a fully evacuated bulb by a stopcock with a small opening. The stopcock is opened for sometime and then closed. The first bulb now contains 0.1 g of D_2 . Calculate the percentage composition by weight of the gases in the second bulb.

$A glass bulb contains 2.24 L of H_{2} and$ $1.12 L of D_{2} at S . T . P . It is connected to$ $a fully evacuated bulb by a stopcock$ $with a small opening . The stopcock is$ $opened for sometime and then closed .$ $The first bulb now contains 0.1 g of D_{2} .$ $Calculate the percentage composition$ $by weight of the gases in the second$ $bulb .$

Question Number 20955 Answers: 1 Comments: 0

lemme join miss Tawa Tawa here. It takes 8 painters working at the same rate ,5 hours to paint a house.If 6 painters are working at 2/3 the rate of the 8 painters,how long would it take them to paint the same house?

$lemme join miss Tawa Tawa here .$ $It takes 8 painters working at the$ $same rate, 5 hours to paint a$ $house . If 6 painters are working at$ $2 / 3 the rate of the 8 painters, how$ $long would it take them to paint$ $the same house ?$

Question Number 18429 Answers: 0 Comments: 6

30cm^3 of hydrogen at s.t.p combines with 20cm^3 of oxygen to form steam according to the following equation, 2H_2 (g) + O_2 (g) → 2H_2 O (g). Calculate the total volume of gaseous mixture at the end of the reaction.

${30 cm}^{3} of hydrogen at s . t . p combines with {20 cm}^{3} of oxygen to form steam$ $according to the following equation, {2 H}_{2} (g) + O_{2} (g) \to {2 H}_{2} O (g) .$ $Calculate the total volume of gaseous mixture at the end of the reaction .$

Question Number 18384 Answers: 1 Comments: 0

Let a, b, c ∈ R, a ≠ 0, such that a and 4a + 3b + 2c have the same sign. Show that the equation ax^2 + bx + c = 0 can not have both roots in the interval (1, 2).

$Let a, b, c \in R, a \neq 0, such that a and$ $4 a + 3 b + 2 c have the same sign . Show$ $that the equation {a x}^{2} + b x + c = 0 can$ $not have both roots in the interval$ $(1, 2) .$

Question Number 19200 Answers: 0 Comments: 5

A river of width d is flowing with speed u as shown in the figure. John can swim with maximum speed v relative to the river and can cross it in shortest time T. John starts at A. B is the point directly opposite to A on the other bank of the river. If t be the time John takes to reach the opposite bank, match the situation in the column I to the possibilities in column II. Column I (A) John reaches to the left of B (B) John reaches to the right of B (C) John reaches the point B (D) John drifts along the bank while minimizing the time Column II (p) t = T (q) t > T (r) u < v (s) u > v

$A river of width d is flowing with speed$ $u as shown in the figure . John can swim$ $with maximum speed v relative to the$ $river and can cross it in shortest time$ $T . John starts at A . B is the point$ $directly opposite to A on the other$ $bank of the river . If t be the time John$ $takes to reach the opposite bank, match$ $the situation in the column I to the$ $possibilities in column II .$ $Column I$ $(A) John reaches to the left of B$ $(B) John reaches to the right of B$ $(C) John reaches the point B$ $(D) John drifts along the bank while$ $minimizing the time$ $Column II$ $(p) t = T$ $(q) t > T$ $(r) u < v$ $(s) u > v$

Question Number 18357 Answers: 0 Comments: 0

From the topic transformer prove that: e = (√2) ε cos(ωt)

$From the topic transformer$ $prove that : e = \sqrt{2} ε \cos (ω t)$

Question Number 18349 Answers: 0 Comments: 0

Consider the iteration x_(k+1) =x_k −(([f(x)]^2 )/(f(x_k +f(x_k ))−f(x_k ))), k=0,1,2,... for the solution of f(x)=0. Explain the connection with Newton′s method, and show that (x_k ) converges quadratically if x_0 is sufficiently close to the solution.

$C o n s i d e r t h e i t e r a t i o n$ $x_{k + 1} = x_{k} - \frac{{[f (x)]}^{2}}{f (x_{k} + f (x_{k})) - f (x_{k})}, k = 0, 1, 2, . . .$ $f o r t h e s o l u t i o n o f f (x) = 0 . E x p l a i n t h e$ $c o n n e c t i o n w i t h {N e w t o n}^{'} s m e t h o d, a n d s h o w$ $t h a t (x_{k}) c o n v e r g e s q u a d r a t i c a l l y i f x_{0} i s$ $s u f f i c i e n t l y c l o s e t o t h e s o l u t i o n .$

Question Number 18366 Answers: 1 Comments: 0

Question Number 18322 Answers: 1 Comments: 1

The pulley arrangements are identical. The mass of the rope is negligible. In (a), the mass m is lifted up by attaching a mass (2m) to the other end of the rope. In (b), m is lifted up by pulling the other end of the rope with a constant downward force F = 2mg. In which case, the acceleration of m is more?

$The pulley arrangements are identical .$ $The mass of the rope is negligible . In$ $(a), the mass m is lifted up by attaching$ $a mass (2 m) to the other end of the rope .$ $In (b), m is lifted up by pulling the$ $other end of the rope with a constant$ $downward force F = 2 m g . In which$ $case, the acceleration of m is more ?$

Question Number 18320 Answers: 1 Comments: 0

In a triangle ABC with fixed base BC, the vertex A moves such that cos B + cos C = 4 sin^2 (A/2) . If a, b and c denote the lengths of the sides of the triangle opposite to the angles A, B and C respectively, then (1) b + c = 4a (2) b + c = 2a (3) Locus of point A is an ellipse (4) Locus of point A is a pair of straight lines

$In a triangle A B C with fixed base B C,$ $the vertex A moves such that \cos B +$ $\cos C = 4 \sin^{2} \frac{A}{2} . If a, b and c denote$ $the lengths of the sides of the triangle$ $opposite to the angles A, B and C$ $respectively, then$ $(1) b + c = 4 a$ $(2) b + c = 2 a$ $(3) Locus of point A is an ellipse$ $(4) Locus of point A is a pair of straight$ $lines$

Question Number 18274 Answers: 1 Comments: 0

A balloon moves up vertically such that if a stone is projected with a horizontal velocity u relative to balloon, the stone always hits the ground at a fixed point at a distance ((2u^2 )/g) horizontally away from it. Find the height of the balloon as a function of time.

$A balloon moves up vertically such$ $that if a stone is projected with a$ $horizontal velocity u relative to balloon,$ $the stone always hits the ground at a$ $fixed point at a distance \frac{2 u^{2}}{g} horizontally$ $away from it . Find the height of the$ $balloon as a function of time .$

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