Kinematics (NEET Physics): Questions 68  72 of 229
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Question number: 68
» Kinematics » Motion in a Plane
Question
As shown in figure the tension in the horizontal cord is 30 N. The weight Wand tension in the string OA in newton are
In above fig we show that tension acting on the cube of weight w and and tension in horizontal cord is 30 N.
Choices
Choice (4)  Response  

a.  30 , 60 

b.  30 , 90 

c.  30 , 30 

d.  None of the above 

Question number: 69
» Kinematics » Motion in a Plane
Question
A force (where K is a positive constant) acts on a particle moving in the xy plane. Starting from the origin, the particle is taken along the positive xaxis to the point (a, 0) and then parallel to the yaxis to the point
(a, a). The total work done by the forces F on the particle is
Choices
Choice (4)  Response  

a.  2Ka ^{2} 

b.  Ka ^{2} 

c.  Ka ^{2 } 

d.  2Ka ^{2} 

Question number: 70
» Kinematics » VelocityTime Graphs
Question
A man crosses a 320 m wide river perpendicular to the current in 4 minutes. If in still water he can swim with a speed 5/3 times that of the current, then the speed of the Current in m/min is
Choices
Choice (4)  Response  

a.  40 

b.  30 

c.  50 

d.  60 

Question number: 71
» Kinematics » Average Speed and Instantaneous Velocity
Question
The length of second’s hand in watch is 1 cm. The change in velocity of its tip in 15 seconds is
Choices
Choice (4)  Response  

a.  zero 

b.  cm/sec 

c.  cm/sec 

d.  cm/sec 

Question number: 72
» Kinematics » Average Speed and Instantaneous Velocity
Question
A person aiming to reach the exactly opposite point on the bank of a stream is swimming with a speed of 0.5 m/s at an angle of 120° with the direction of flow of water. The speed of water in the stream is
Choices
Choice (4)  Response  

a.  lm/s 

b.  0.433 m/s 

c.  0.25 m/s 

d.  0.5 m/s 
