Related Questions

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
Who invented the hot air balloon?
A Montgolfier brothers
B Wright brothers
C Lisitsyn brothers
D Walton brothers
A balloon filled with helium rises in air because
A Air exerts an upward force on the balloon
B The balloon is weightless
C Helium is less dense than air
D Helium pushes down on the air below the balloon
Cyclonic precipitation is caused by lifting of an air mass due to
A pressure difference
B temperature difference
C natural topographical barriers
D all of the above
The helium-filled balloon -----.
A rose in the air
B was rising in the air
C was in air
D rose into the air
Person who pilots or travels in a balloon, airship or other aircraft
A Aeronaut
B Astronaut
C Aerobat
D Acrobat
H উচ্চতায় অবস্থিত একটি বেলুন থেকে একটি পাথর ছেড়ে দিলে তা । উচ্চতায় অবস্থিত একটি হেলানো তনের উপর আছড়ে পড়ে। হেলানো শুলকে আঘাতের পর পাথরটির বেগ আনুভূমিক হয়। h/H এর মান কত হলে পাথরটি ভূমিকে স্পর্শ করতে সর্বোচ্চ সময় নিবে? (A stone falls from a balloon at a height of H above the ground and hits an inclined plane in its path at a height of h. After impact, the velocity of the stone becomes horizontal. What should be the value of hill so that the stone will take maximum time to reach the ground?)
A H-hh
B 12
C 32
D hH-h
E 2
Find out which quotation part of the following sentences has an error. 'The most' difficult job is 'to band' and then 'lifting' 'the weight'
A the most
B to band
C lifting
D the weight
Which underlined part of the following sentence has an error? (a) The most difficult job is (b) to band and then (c) lifting (d) the weight.
A a
B b
C c
D d
Which of the following pump is successfully used for lifting water from deep wells?
A Centrifugal pump
B Reciprocating pump
C Jet pump
D Air lift pump

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