Kinematics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 67  70 of 233
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Question number: 67
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
What is the value of linear velocity, if co = 3i 4j + k and r = 5i  6j + 6k
Choices
Choice (4)  Response  

a.  18  13 + 2 

b.  6  2 + 8 

c.  4  13 + 6 

d.  6  2 + 3 

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 
