Laws of Motion (NEET Physics): Questions 28  31 of 114
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Question number: 28
» Laws of Motion » Force and Inertia
Question
A particle of mass m slides down from the vertex of semihemisphere, without any initial velocity. At what height from horizontal will the particle leave the sphere
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 29
» Laws of Motion » Force and Inertia
Question
A cricket ball of mass 250 gm moving with a velocity of 24 m/s is hit by a bat so that it acquires a velocity of 28 m/s in the opposite direction. The force acting on the ball, if the contact time is 1/100 of a second, will be 
Choices
Choice (4)  Response  

a.  1300 N in the final direction of ball  
b.  13 N in the initial direction of ball  
c.  1.3 N in the initial direction of ball  
d.  130 N in the final direction of ball 
Question number: 30
» Laws of Motion » Force and Inertia
Question
A string of length 1 m is fixed at one end and carries a mass of 100 gm at the other end. The string makes 2/jt revolutions per second about a vertical axis through the fixed end. The angle of inclination of the string with the vertical, and the linear velocity of the mass will respectively be  (in M. K. S. system)
Choices
Choice (4)  Response  

a.  50°14′, 3.16  
b.  52°14′, 1.6  
c.  52°14′, 3.16  
d.  50°14′, 1.6 
Question number: 31
» Laws of Motion » Force and Inertia
Question
The roadway bridge over a canal is the form of an arc of a circle of radius 10 m. What is the minimum speed with which a car can cross the bridge without leaving contact with the ground at the highest point (g = 9.8 m/s ^{2})
Choices
Choice (4)  Response  

a.  7.556 m/s  
b.  5.76 m/s  
c.  14.654 m/s  
d.  9.899 m/s 