NEET Physics: Questions 186  190 of 2142
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Question number: 186
» Laws of Motion » Centripetal Force
Question
An electron is moving in a circular orbit of radius 5.3 x 10 ^{11} metre around the atomic nucleus at a rate of 6.6 x 1015 revolutions per second. The centripetal force acting on the electron will be 
(The mass of the electron is 9.1 x 10  31kg)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 187
» Kinematics » Motion in a Straight Line
Question
A motor car is travelling at 50 m/s on a circular road of radius 600 m. It is increasing its speed at the rate of 4 m/s ^{2}. Its net acceleration is (in m/s ^{2}) –
Choices
Choice (4)  Response  

a.  4.8 

b.  5.7 

c.  2 

d.  0 

Question number: 188
» Kinematics » Average Speed and Instantaneous Velocity
Question
A particle moves in a circle of radius 20cm with a linear speed of 10m/s. The angular velocity will be –
Choices
Choice (4)  Response  

a.  100 rad/s 

b.  50 rad/s 

c.  25 rad/s 

d.  75 rad/s 

Question number: 189
» Laws of Motion » Centripetal Force
Question
The maximum speed at which a car can turn round a curve of 40 metre radius on a level road if the coefficient of friction between the tyres and the road is 0.6, will be –
Choices
Choice (4)  Response  

a.  15.3 m/s 

b.  9.0 m/s 

c.  10.8 m/s 

d.  17.8 m/s 

Question number: 190
» Laws of Motion » Centripetal Force
Question
A smooth table is placed horizontally and a spring of unstarched length 0 and force constant k has one end fixed to its center. To the other end of the spring is attached a mass m which is making n revolution per second around the center. Tension in the spring will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

