A)
A,B,C, and D are four trees, located at the vertices of a square (Fig. 5.117). Wind blows from A to B with uniform speed. The ratio of times of flight of a bird from A to B and from B to A is n. At what angle should the bird fly from the direction of wind flow, in order that it starts from A and (a) reaches C, (b) reaches D ?
28
Aug
A,B,C, and D are four trees, located at the vertices of a square (Fig. 5.117). Wind blows from A to B with uniform speed. The ratio of times of flight of a bird from A to B and from B to A is n. At what angle should the bird fly from the direction of [...]
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A helicopter flies horizontally with constant velocity in a direction θ east of north between two points A and B ,
A) ,
and D are four trees ,
at distance d apart. Wind is blowing from south with constant speed u; the speed of helicopter relative to air is nu ,
B ,
C ,
where n > 1. Find the speed of the helicopter along AB. The helicopter returns from B to A with same speed nu relative to air in same wind. Find the total time for the journeys. ,
A particle projected at a definite angle alpha to the horizontal passes through points (a,b) and (b,a), referred to horizontal and vertical axes through the points of projection. Show that : (a) The horizontal range R = (a^2 + ab + b^2)/(a + b) . (b) The angle of projection prop is given by tan^-1 [(a^2 + ab + b^2)/(ab)].
28
Aug
A particle projected at a definite angle alpha to the horizontal passes through points (a,b) and (b,a), referred to horizontal and vertical axes through the points of projection. Show that : (a) The horizontal range R = (a^2 + ab + b^2)/(a + b) . (b) The angle of projection prop is given by tan^-1 [...]
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A particle is projected over a triangle from one extremity of its horizontal base. Grazing over the vertex ,
A particle projected at a definite angle prop to the horizontal passes through points (a ,
A) ,
b) and (b ,
it falls on the other extremity of the base. If a and b are the base angles of the triangle and θ the angle of projection ,
prove that tanθ=tanα+tanβ ,
Show that a.(b * c) is equal in magnitude to the volume of the parallelepiped formed on the vectors , a, b and c .
23
Aug
Show that a.(b * c) is equal in magnitude to the volume of the parallelepiped formed on the vectors , a, b and c . A) b and c`. Show that a.(b\times c) is equal in magnitude to the volume of the parallelepiped formed on the three vectors August 23, 2020 Category: Uncategorised (JEE Advanced [...]
A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter reading are VA, VB and VC respectively. Then
22
Aug
A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter reading are VA, VB and VC respectively. Then 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied [...]
A, B and C are three points in a uniform electric field. The electric potential is
18
Aug
A, B and C are three points in a uniform electric field. The electric potential is A) B and C are three points in a uniform electric field. The electric potential is August 18, 2020 Category: Chapter 20 - Electric Field and Potential , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry [...]
There are three copper wires of length and cross-sectional area (L, A), (2 L, A/2) (L/2, 2A). In which case is the resistance minimum ?
18
Aug
There are three copper wires of length and cross-sectional area (L, A), (2 L, A/2) (L/2, 2A). In which case is the resistance minimum ? (2 L 2A). In which case is the resistance minimum ? A) A/2) (L/2 There are three copper wires of length and cross-sectional area (L August 18, 2020 Category: Chapter [...]