Advertisements
Advertisements
प्रश्न
Give the magnitude and direction of the net force acting on a drop of rain falling down with a constant speed.
उत्तर
Since the raindrop falls downward at a constant velocity, its acceleration is zero. Therefore, according to Newton's first law of motion, the net force acting on the raindrop is zero, i.e., a = 0 Consequently, from the equation F = ma, we have F = 0.
APPEARS IN
संबंधित प्रश्न
If the speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory of the stone after the string breaks?
A plumb bob is hung from the ceiling of a train compartment. If the train moves with an acceleration 'a' along a straight horizontal track , the string supporting the bob makes an angle tan−1 (a/g) with the normal to the ceiling. Suppose the train moves on an inclined straight track with uniform velocity. If the angle of incline is tan−1 (a/g), the string again makes the same angle with the normal to the ceiling. Can a person sitting inside the compartment tell by looking at the plumb line whether the train is accelerating on a horizontal straight track or moving on an incline? If yes, how? If not, then suggest a method to do so.
Three rigid rods are joined to form an equilateral triangle ABC of side 1 m. Three particles carrying charges 20 μC each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame. The magnitude of the resultant force on the charged particle at A is.
An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a frictionless horizontal table. The force required to keep this object moving with the same velocity is :
Explain the following :
After alighting from a moving bus , one has to run for some distance in the direction of bus in order to avoid falling .
The greater is the __________ the greater is the inertia of an object.
A man riding on a car has ___________ Inertia.
Classify the types of force based on their application.
Newton's first law of motion describes ______.
The masses of 10 kg and 20 kg, respectively, are connected by massless spring as shown in the figure. A force of 200 N acts on the 20 kg mass. At the instant shown, the 10 kg mass has acceleration of 12 m/s2. What is the acceleration of 20 kg mass?
(g = 10 m/s2)