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 running at a constant velocity of 36 km/h. Neglect air resistance.
उत्तर
As the train travels at a constant speed, it has no acceleration. Thus, no forces resulting from the train's motion affect the stone. Therefore, force on the stone F = weight of stone = mg = 0.1 × 10 = 1.0 N
This force acts vertically downward.
APPEARS IN
संबंधित प्रश्न
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.
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 accelerating with 1 m s–2. 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.
Explain why passengers are thrown forward from their seats when a speeding bus stops suddenly.
In figure, a body A of mass m slides on plane inclined at angle θ1 to the horizontal and µ1 is the coefficent of friction between A and the plane. A is connected by a light string passing over a frictionless pulley to another body B, also of mass m, sliding on a frictionless plane inclined at angle θ2 to the horizontal. Which of the following statements are true?
- A will never move up the plane.
- A will just start moving up the plane when `µ = (sin θ_2 - sin θ_1)/(cos θ_1)`
- For A to move up the plane, θ2 must always be greater than θ1.
- B will always slide down with constant speed.
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.
