Laws of Motion (NEET Physics): Questions 43  47 of 114
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Question number: 43
» Laws of Motion » Force and Inertia
Question
A stone of mass 1 kg tied to a light inextensible string of length L = 40/3 m is whirling in a circular path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension in the suing is 4 and if g is taken to be 10m/sec ^{2}, the speed of the stone at the highest point of the circle is
Choices
Choice (4)  Response  

a.  20 m/sec 

b.  5√2m/sec 

c.  10√3m/Sec 

d.  10 m/sec 

Question number: 44
» Laws of Motion » Force and Inertia
Question
A body of mass m tied at the end of a string of length i is projected with velocity , at what height will it leave the circular path –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 45
» Laws of Motion » Force and Inertia
Question
particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration ac is varying with time t as ac = k ^{2} rt ^{2}, where k is a constant. The power delivered to the particle by the force acting on it will be
Choices
Choice (4)  Response  

a.  mk ^{2} t ^{2} r 

b.  mk ^{2} t ^{2} r ^{2} 

c.  mk ^{2} r ^{2} t 

d.  m ^{2} k ^{2} t ^{2} r ^{2} 

Question number: 46
» Laws of Motion » Force and Inertia
Question
A 4 kg balls is swing in a vertical circle at the end of a cord 1 m long. The maximum speed at which it can swing if the cord can sustain maximum tension of 163.6 N will be –
Choices
Choice (4)  Response  

a.  36 m/s 

b.  8 m/s 

c.  6 m/s 

d.  64 m/s 

Question number: 47
» Laws of Motion » Force and Inertia
Question
A mass of 60 kg is on the floor of a lift moving down. The lift moves at first with an acceleration of 3 m/sec ^{2}, then with constant velocity and finally with a retardation of 3m/sec2. Choose the correct options related to possible reactions exerted by the lift on the body in each part of the motion –
Select the correct answers and mark it according to the following
 408 N
 588 N
 768 N
 508 N
Choices
Choice (4)  Response  

a.  2 and 4 are correct 

b.  1, 2 and 3 are correct 

c.  1 and 3 are correct 

d.  1 and 2 are correct 
