The resultant of × 0 will be equal to
zero
A
zero vector
unit vector
A body is whirled in a horizontal circle of radius 20 cm. It has an angular velocity of 10 rad/s. What is its linear velocity at any point on circular path?
√2 m/s
2 m/s
10 m/s
20 m/s
P is the point of contact of a wheel and the ground. The radius of wheel is 1 m. The wheel rolls on the ground without slipping. The displacement of point P when wheel completes half rotation is
2 m
π m
A car runs at a constant speed on a circular track of radius 100m, taking 62.8 s for every circular lap. The average velocity and average speed for each circular lap respectively is
0, 0
0, 10 m/s
10 m/s, 10 m/s
10 m/s, 0
A body constrained to move in Y-direction is subjected to a force given by . What is the work done by this force in moving the body through a distance of 10 m along Y-axis?
190 J
160 J
150 J
20 J
and are two vectors and θ is the angle between them, if | × | = √3 ( . ) the value of θ is
60°
45°
30°
90°
A bullet is fired from a gun with a speed of 100 m/s in order to hit a target 100m away. At what height above the target should the gun be aimed? (The resistance of air is negligible and g = 10 m/s2)
5 cm
10 cm
15 cm
20 cm
The speed of a boat is 5km/h in still water. It crosses a river of width 1.0 km along the shortest possible path in 15min. The velocity of the river water is (in km/h)
5
1
3
4
A stone tied to the end of a string of 1 m long is whirled in a horizontal circle with a constant speed. If the stone makes 22 revolutions in 44s, what is the magnitude and direction of acceleration of the stone?
and direction along the radius towards the centre
π2 ms-2 and direction along the radius away from centre
π2 ms-2 and direction along the radius towards the centre
π2 ms-2 and direction along the tangent to the circle
The vector sum of two forces is perpendicular to their vector differences. In that case, the forces
are not equal to each other in magnitude
cannot be predicted
are equal to each other
are equal to each other in magnitude
