A rod of length PQ = l leans by its upper end against a smooth vertical wall while its end leans against the base. The end Q of the rod moves uniformly downward with speed v1. The end P will move on the floor with velocity v2 such that :
v2 is uniform and v2 = v1
v2 is uniform but v2 ≠ v1
v2 continuously increases
v2 continuously decreases
0o
30o
45o
60o
0
π/2
π/4
π
90o
180o
None
The force acting on a body of 10 kg is N. If the body is initially at rest, then velocity at the end of 20 sec will be (in m/s).
2√6
6√2
3√2
2√3
If a vector is perpendicular to the vector , then the value of α is
-1
1/2
-1/2
1
A person walks up a stationary escalator in time t1. If the person remains stationary on the escalator, then it can take him up in time t2. The time that would it take him to walk up the moving escalator is
t1 - t2
t2 - t1
is written by some student. Then, it
is not possible
has the same direction as that of
has direction opposite to that of
has no definite direction
The vectors satisfy then,
is perpendicular to both and
and are essential products
is parallel to both and
Rain is falling vertically with a speed of 30 ms-1. A man rides a bicycle with a speed of 10 ms-1 in north to south direction. The angle with the vertical at which the man should hold his umbrella to protect himself from the rain is:
None of these
