Laws of MotionForce and Inertia (NEET Physics): Questions 26  30 of 57
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 550.00 or
Question number: 26
» 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: 27
» 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: 28
» 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: 29
» 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: 30
» 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 
