What is the angle that the given vector makes with y-axis and A=2i+3j ?
(A) 30°
(B) 60°
(C) 90°
(D) 120°
A central force is that which__________________?
(A) Can produce torque
(B) Cannot produce torque
(C) Some time can produce torque some time cannot
(D) Has no relation with torque
In which quadrant, the only value of tan will be positive ?
(A) First
(B) Second
(C) Third
(D) Both 1st and 3rd
The cross product of two vectors is a negative vector when______________?
(A) They are parallel vectors
(B) They are anti parallel vectors
(C) They are a perpendicular vector
(D) They are rotated through 270°
The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is_______________?
(A) 2i^ – 2j^ + k^
(B) (2i^ – 2j^ +k^)/9
(C) (2i^ – 2j^ +k^)/3
(D) (2i^ – 2j^ +k^)/5
Torque is defined as______________?
(A) Turning effect of force
(B) Cross product of position vector and force
(C) Product of force and moment arm
(D) All A, B and C are correct
The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is________________?
(A) 30°
(B) 45°
(C) 60°
(D) 180°
An angle between two vectors A and B can be determined by_____________?
(A) Their dot product
(B) Their cross product
(C) Head to tail rule
(D) Right-hand rule
Which one is a unit vector ?
(A) ??3 i^ + ??3 j^ + ??3 k^
(B) 1/??3 i^ + 1/??3 j^ +1/ ??3 k^
(C) ??3 / 3 i^ + ??3 / 3 j^ + ??3 / 3 k^
(D) Both B and C are correct