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গরম বাতাসে পরিপূর্ণ M ভরের একটি বেলুন (থ্রডি সহ) পৃথিবীর দিকে খুব ত্বরণ a তে নেমে আসছে। ঝুড়ি থেকে কি পরিমান m ভর ফেলে দিলে বেলুনটি উপরের দিকে একই খুব ত্বরন a- তে উঠে যাবে ? সকল ক্ষেত্রে বেলুনটির আয়তন একই ছিল বলে ধরে নেওয়া হলো। (g = অভিকর্ষীয় ত্বরন)(A hot air balloon with a bucket is descending towards the earth with a constant acceleration a. The combined mass of the balloon and bucket is M. What mass m from the bucket should be released so that the balloon starts ascending up with the same acceleration a? Consider the volume of the balloon remains constant at all the time. (g=acceleration due to gravity))
A m=2ag+aM
B m=g+a2M
C m=2ag M
D m=M2a(g+a)
E m=ag+M
The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be
A Parallel to each other
B Perpendicular to each other
C Inclined at 45°
D Opposite to each other
Sense of tangential acceleration of a link
A Is same as that of velocity
B Is opposite to that of velocity
C Could be either same or opposite to velocity
D Is perpendicular to that of velocity
The direction of Coriolis component of acceleration is the direction
A Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link
B Along the centripetal acceleration
C Along tangential acceleration
D Along perpendicular to angular velocity
According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of
A Motion of conductor
B Lines of force
C Either of the above
D None of the above
Mathematically Forc (F) is proportionate to Mass (m) multiplied by Acceleration (a) ; i.e symbolically , F ∞m.a. If an object increases its acceleration by 10% and loses 5% of its mass, by how much will the resultant force change?
A Increase by 5%
B Decrease by 5%
C Increase by 4.5%
D Decrease by 4.5%
When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ to its acceleration.
A Directly proportional
B Inversely proportional
C Cube root
D None of these
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.
A Equal to
B Directly proportional
C Inversely proportional
D None of these
The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration.
A Normal
B Local
C Convective
D Tangential
একজন ছাত্র পরীক্ষাগারে অভিকর্ষজ ত্বরণের মান 9.88 m/sec2 নির্ণয় করন। অপর দিকে যখন সে 0.01 kg ভরের কোনো বাটখারাকে স্প্রিং নিক্তিতে ঝুলিয়ে দিল তখন 0.0980 N বল দেখাচ্ছে। তার পরীক্ষা অভিকর্ষজ ত্বরণের ত্রুটি নির্ণয় কর।(A student measured the value of acceleration due to gravity in the laboratory as 9.88 m/sec2. On the other hand, when he hanged a mass of 0.01 kg in the spring balance, then he found 0.0980 N force. Calculate the percentage of error in the measured value of the acceleration due to gravity.)
A -0.716%
B -0.102%
C 0.816%
D 0.102%
E -0.916%

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