This case is similar to propeller aircraft in which the propeller is mounted on the aircraft.when propeller turns air is blown and as the momentum of air changes it imparts reaction on the blades of the propeller,which in turn moves the air craft.
68) On a stationary sail boat, air is blown from a fan attached to the boat. The boat
Answer is:
does not move
Explanation:
Related General Physics MCQ with Answers
Answer is:
refraction and reflection of sunlight by water droplets
Explanation:
The water droplets in the sky behave like tiny prism. Rays of sunlight entering in to the droplets undergoes one reflection and two refraction. The rainbow appears semicircular for an observer with inner edge violet and outer edge red.
Answer is:
quasars
Explanation:
Formula for Couple acting on body (T)=F*d =Ma*d [F=M*a] =M*dv/t*d [a==(vf-vi)/t)] =M*(d/t/t)*d =Md^2/t^2 =ML^2T^-2
Answer is:
the moon is between the sun and the earth
Explanation:
A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon earth's surface.
Answer is:
the same number of protons but different number of neutrons
Explanation:
Isotope - same atomic number. Isobar - same mass number. Isotones - same number of neutrons.