inclined at an angle of π/3 between them
inclined at an angle of π/6 between them
perpendicular
perpendicular
A particle has two velocities of equal magnitude inclined to each other at an angle θ. If one of them is halved, the angle between the other and the original resultant velocity is bisected by the new resultant. Then θ is
90°
120°
45°
45°
At a telephone enquiry system, the number of phone cells regarding relevant enquiry follow Poisson distribution with an average of 5 phone calls during 10-minute time intervals. The probability that there is at the most one phone call during a 10-minute time period is
6/5
5/6
6/55
6/55
The values of a, for which the points A, B, C with position vectors respectively are the vertices of a right-angled triangle with C =π/2 are
2 and 1
−2 and −1
−2 and 1
−2 and 1
The function has a local minimum at
x = 2
x = −2
x = 0
x = 0
A.
x = 2
Angle between the tangents to the curve y = x2 − 5x + 6 at the points (2, 0) and (3, 0) is
π/2
π/4
π/6
π/6