Kinematics (NEET Physics): Questions 77  81 of 229
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Question number: 77
» Kinematics » Motion in a Straight Line
Question
A metal sphere is hung by a string fixed to a wall. The sphere is pushed away from the wall by a stick. The forces acting on the sphere are shown in the second diagram. Which of the following statements is wrong?
In above fig we shows that metal sphere fixed at the wall, as we apply some force on it then motion is taking place, here angle is .
Choices
Choice (4)  Response  

a.  + + = 0 

b.  T ^{2} + P ^{2} + W ^{2} = 0 

c.  T^{2} = P^{2} + W^{2 } 

d.  p = w 

Question number: 78
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
the vector P = ai + aj + 3k and Q = ai  2j  k are perpendicular to each other. The positive value of a is
Choices
Choice (4)  Response  

a.  4 

b.  9 

c.  3 

d.  13 

Question number: 79
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
A particle moves from position 3i + 2j6k to 14i + 13j + 9k due to a uniform force of (4i + j + 3k) N. If the displacement in metres then work done will be
Choices
Choice (4)  Response  

a.  250 J 

b.  300 J 

c.  100 J 

d.  200 J 

Question number: 80
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
IfAxB= A. B , then angle between A and S will be
Choices
Choice (4)  Response  

a.  30 

b. 
60° 

c. 
45° 

d.  None of the above 

Passage
A particle moves along xaxis and its acceleration at any time t is a = 2 sin (πt), where t is in seconds and a is in m/s ^{2}. The initial velocity of particle (at time t = 0) is u = 0.
Question number: 81 (1 of 3 Based on Passage) Show Passage
» Kinematics » Motion in a Straight Line
Question
The distance travelled (in meters) by the particle from time t = 0 to t = t will be –
Choices
Choice (4)  Response  

a.   + 

b.   

c. 


d.  All of the above 
