A round balloon of radius r subtends an angle

Asked by admin @ 20/08/2021 in Math viewed by 278 People

A round balloon of radius 'r' subtends an angle 'alpha' at the eye of the observer while the angle of elevation of its centre is beta. Prove the height of the centre of the balloon is (r)×(sin beta)×(cosec alpha)/2.

Answered by admin @ 20/08/2021

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A wire of length l and radius r

Asked by admin @ 31/08/2021 in Physics viewed by 304 persons

A wire of length l radius r is stretched by a force f and a second wire of same material with kength 2l and radius 2r is stretched with a …

A conducting ring of radius r is placed perpendicularly

Asked by admin @ 23/08/2021 in Physics viewed by 300 persons

a conducting ring of radius r is placed perpendicularly inside a time varying magnetic field given by B=Bi+ alpha•t. Bi and alpha are positive constant.Emf induced in the ring is

A circular hoop of mass m and radius r

Asked by admin @ 23/08/2021 in Physics viewed by 340 persons

A circular hoop of mass m and radius R rests flat on a horizontal frictionless surface. A bullet also of mass m, and moving with a velocity v, strikes the …

A wheel of radius r is placed on ground

Asked by admin @ 20/08/2021 in Physics viewed by 396 persons

A wheel of radius R is placed on ground and its contact point is P. if wheel starts rolling without slipping and completes half a revolution, find the displacement if …

Twenty seven solid iron spheres each of radius r

Asked by admin @ 20/08/2021 in Math viewed by 292 persons

"Question 9 Twenty seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S'. Find the (i) radius r' …

A spherical ball of mass m and radius r

Asked by admin @ 20/08/2021 in Physics viewed by 302 persons

A spherical ball of mass m and radius r rolls without slipping on a rough concave surface of large radius R. It makes small oscillation about the lowest point. Find …

A particle describes a horizontal circle of radius r

Asked by admin @ 20/08/2021 in Physics viewed by 322 persons

Solve it A particle describes a horizontal circle of radius r on a smooth surface of an inverted cone as shown the height of the plane of circle above vertex …

A concrete sphere of radius r has a cavity

Asked by admin @ 17/08/2021 in Physics viewed by 290 persons

A concrete sphere of radius R has a cavity of radius r which is packed with sawdust. The specific gravities of concrete and sawdust are respectively 2.4 and 0.3 for …

A metal ball of radius r is placed concentrically

Asked by admin @ 17/08/2021 in Physics viewed by 363 persons

A metal ball of radius `r` is placed concentrically inside hollow metal sphere of inner radius `2r` and outer radius `3r`.The ball is given a charge `+2q` and the hollow …

A spherical body of mass m and radius r

Asked by admin @ 17/08/2021 in Physics viewed by 346 persons

A spherical body of mass m and radius r is allowed to fall in a medium of viscosity η. The time in which the velocity of the body increases from …

A solid cylinder of radius r and height h

Asked by admin @ 17/08/2021 in Math viewed by 338 persons

a solid cylinder of radius R and a height h is placed over other cylinder of Mi same height and radius find the total surface area of the shape formed

The breaking stress for a wire of radius r

Asked by admin @ 17/08/2021 in Physics viewed by 274 persons

The breaking stress for a wire of radius r of given material is the breaking stress for the wire of same material of radius 2r is: options

A circular loop of radius r carrying current i

Asked by admin @ 16/08/2021 in Physics viewed by 334 persons

A circular loop of radius r carrying a current i is held at the centre of another circular loop of radius R(>>r) carrying a current I. The plane of the …

Figure shows three circular arcs each of radius r

Asked by admin @ 16/08/2021 in Physics viewed by 276 persons

Figure shows three circular arcs, each of radius R and total charge as indicated. The net electric potential at the centre of curvature is (a) Q4π∈0R (b) Q2π∈0R (c) 2Qπ∈0R …

A ball of radius r carries a positive charge

Asked by admin @ 13/08/2021 in Physics viewed by 323 persons

A ball of radius r carries a positive charge whose volume charge density depends only on separation r from the ball's centre as =0(1rr)=0(1rr) where 00 is a constant. Assuming …