Advertisements
Advertisements
प्रश्न
Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg, just after it is dropped from the window of a train accelerating with 1 m s–2. Neglect air resistance.
उत्तर
The stone will experience an additional force F’ (along horizontal), i.e.,F = ma = 0.1 x 1 = 0.1 N As the stone is dropped, the force F’ no longer acts, and the net force acting on the stone F = mg = 0.1 x 10 = 1.0 N (vertically downwards).
APPEARS IN
संबंधित प्रश्न
Give the magnitude and direction of the net force acting on a cork of mass 10 g floating on water.
Give the magnitude and direction of the net force acting on a kite skillfully held stationary in the sky.
Give the magnitude and direction of the net force acting on a car moving with a constant velocity of 30 km/h on a rough road.
Give the magnitude and direction of the net force acting on a high-speed electron in space far from all material objects, and free of electric and magnetic fields.
A pebble of mass 0.05 kg is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble,
- during its upward motion,
- during its downward motion,
- at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of 45° with the horizontal direction? Ignore air resistance.
Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg, just after it is dropped from the window of a stationary train. Neglect air resistance.
Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg, just after it is dropped from the window of a train running at a constant velocity of 36 km/h. Neglect air resistance.
Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg, lying on the floor of a train which is accelerating with 1 m s–2, the stone being at rest relative to the train. Neglect air resistance.
The velocity of a body of mass 2 kg as a function of t is given by `v(t) = 2t hati + t^2hatj`. Find the momentum and the force acting on it, at time t = 2s.
A cricket bowler releases the ball in two different ways
- giving it only horizontal velocity, and
- giving it horizontal velocity and a small downward velocity. The speed vs at the time of release is the same. Both are released at a height H from the ground. Which one will have greater speed when the ball hits the ground? Neglect air resistance.
