NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 161  163 of 2142
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Question number: 161
» Kinematics » Average Speed and Instantaneous Velocity
Question
A projectile can have the same range R for two angles of projections. If t1 and t2 be the times of flight in two cases, then choose the incorrect relations –
Choices
Choice (4)  Response  

a.  t _{1} t _{2} 

b.  t _{1} t _{2} t _{1} t _{2} 

c.  t _{1} t _{2} 

d.  t _{1} t _{2} 

Question number: 162
» Kinematics » Average Speed and Instantaneous Velocity
Question
The angular displacement of a particle is given by where co0 and a are constant and ∞0 = 1 rad/sec, α = 1.5 rad/sec2. The angular velocity at time, t = 2 sec will be (in rad/sec) –
Choices
Choice (4)  Response  

a.  5 

b.  1 

c.  3 

d.  4 

Question number: 163
» Kinematics » Average Speed and Instantaneous Velocity
Assertion (Ꭺ)
A man projects a stone with speed u at some angle. He again projects a stone with same speed such that time of flight now is different. The horizontal ranges in both the cases may be same. (Neglect air friction)
Reason (Ꭱ)
The horizontal range is same for two projectiles projected with same speed if one is projected at an angle 6 with the horizontal and other is projected at
an angle (90°  6) with the horizontal. (Neglect air friction)
Choices
Choice (4)  Response  

a.  Ꭺ is true but Ꭱ is false 

b.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

c.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

d.  Both Ꭺ and Ꭱ are false 
