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CBSE Class 11-science Answered

how can the flight of bird be explained by Newton's third law ??
Asked by shuchi.saumya | 20 Sep, 2010, 12:00: AM
answered-by-expert Expert Answer
For flying the bird pushes the air down with its features in a direction that has both vertical and horizontal component. Now since the bird exerts force on the air the air molecules also exert an equal and opposite force on the bird whose vertical component is used by the bird for lifting up and horizontal component is used for moving forward.
 
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Answered by | 20 Sep, 2010, 08:16: PM

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CBSE 11-science - Physics
Respected Ma'am/Sir please clarify my doubt.
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CBSE 11-science - Physics
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CBSE 11-science - Physics
Two blocks of mass m=5kg and M=10 kg are connected by a string passing over a pulley B as shown. Another string connects the centre of the pulley B to the floor and passes over another pulley A as shown. An upward force F is applied at the centre of pulley A. Both the pulleys are massless. Find the acceleration of both the blocks if 1) F=100N.  2)F=500N
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CBSE 11-science - Physics
A block of mass m is placed on a wedge as shown. Find difference between maximum and minimum (a(max) – a(min) ) horizontal rightward acceleration of wedge for which block remains at rest with respect to wedge. (A) 10g/9 (B) g/9 (C) g (D) None of these
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CBSE 11-science - Physics
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CBSE 11-science - Physics
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CBSE 11-science - Physics
In the arrangement shown in the figure, a heavy pulley of mass M is suspended from a spring of stiffness constant K and the mass m is suspended from a string tightly wound on the pulley. If the mass m is given a small downward displacement and released, find the time period of small oscillations (Take pulley as Disc) and string does not slips on the pulley.
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CBSE 11-science - Physics
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