The width of river is 1 km. The velocity of boat is 5km/hr . The boat covered the width of river in shortest time 15 min. Then the velocity of river stream is
A 500 kg car takes a round turn of radius 50m with a velocity of 36km/hr . The centripetal force is
A person aiming to reach exactly opposite point on the bank of a stream is swimming with a speed of 0.5m/s at an angle of 120° with the direction of flow of water. The speed of water in the stream, is
A ball of mass 0.25 kg attached to the end of a string of length 1.96m is moving in a horizontal circle. The string will break if the tension is more than 25 N. What is the maximum speed with which the ball can be moved?
A body is whirled in a horizontal circle of radius 20 cm. It has an angular velocity of 10rad/s What is its linear velocity at any point on circular path?
The angular speed of a flywheel making 120 revolutions/minute is
A boat is sent across a river with a velocity of 8 km hr¯¹ . If the resultant velocity of boat is 10 km hr¯¹ , then velocity of river is
If a body A of mass M is thrown with velocity v at an angle of 30° to the horizontal and another body B of the same mass is thrown with the same speed at an angle of 60° to the horizontal, the ratio of horizontal range of A to B will be
An electric fan has blades of length 30 cm measured from the axis of rotation. If the fan is rotating at 120 rpm, the acceleration of a point on the tip of the blade is
