Physics
Chapter No 3
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#25 A ball of mass 0.5kg is dropped from a height of 78.4m. The time taken by the ball to hit the ground is
A) 8sec
B) 16sec
C) 2sec
D) 4sec
#26 The vertical component of velocity at maximum height of projectile is
A) 0m/s
B) Vi sinθ
C) Vi sinθ – gt
D) Vi
#27 The height attained by projectile, projected at V is H. If the speed of projection is tripled keeping other parameter constant. The maximum height attained now will be
A) H
B) 2H
C) 3H
D) 9H
#28 A projectile is projected at a speed of 19.6m/s making an angle of 30° with horizantal direction. The vertical after 1.0sec of its flight will be
A) 0m/s
B) 9.8m/s
C) 19.6m/s
D) 4.9m/s
#29 The ratio of K. energies of projectile at Hmax and point of projection of projectile is
A) cosθ
B) cos2θ
C) secθ
D) sec2θ
#30 A hunter aiming a bird in a tree should aim
A) Exectly at the bird
B) A little above the bird
C) A little below the bird
D) Very high
#31 The range of projectile projected with Vi at an angle θ with horizantal direction on earth is Re. If the same projectile is projected on moon with Vi and an angle θ(gm=g/6) then range of projectile will be
A) Re
B) 2Re
C) 6Re
D) Re/6
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