NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 156  160 of 2142
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Question number: 156
» Kinematics » Motion in a Plane
Question
A body is thrown at an angle 30° to the horizontal with the velocity of 30 m/s. After 1 sec, its velocity will be (in m/s) (g = 10 m/s2)
Choices
Choice (4)  Response  

a.  10√7 

b.  √10 

c.  100√7 

d.  700√10 

Question number: 157
» Kinematics » Uniformly Accelerated Motion
Question
Using rectangular coordinates and the unit vectors i and j, the vector expression for the acceleration a will be (r is a position vector) 
Choices
Choice (4)  Response  

a.  2r ^{2 } 

b.   ^{2} r 

c. 


d.  r ^{2} 

Question number: 158
» Kinematics » Average Speed and Instantaneous Velocity
Question
A ball is thrown from the top of a tower with an initial velocity of 10 m/s at an angle of 30° above the horizontal. It hits the ground at a distance of 17.3 m from the base of the tower. The height of the tower (g = 10 m/s2) will be
Choices
Choice (4)  Response  

a.  10m 

b.  110m 

c.  100m 

d.  12m 

Question number: 159
» Kinematics » Uniformly Accelerated Motion
Question
The angular velocity of a particle is given by co = 1.51  3t ^{2} + 2, the time when its angular acceleration decreases to be zero will be 
Choices
Choice (4)  Response  

a.  0.25 sec 

b.  25 sec 

c.  1.2 sec 

d.  12 sec 

Question number: 160
» Kinematics » Average Speed and Instantaneous Velocity
Question
The vertical section of a road over a canal bridge in the direction of its length is in the form of circle of radius 8.9 meter. Find the greatest speed at which the car can cross this bridge without losing contact with the road at its highest point, the center of gravity of the car being at a height h = 1.1 meter from the ground. (Take g = 10 m/sec2)
Choices
Choice (4)  Response  

a.  7 m/s 

b.  10 m/s 

c.  5 m/s 

d.  13 m/s 
