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?
Fill in the following blank with suitable word :
Newton’s first law of motion is also called Galileo’s law of ………………………
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.
In an imaginary atmosphere, the air exerts a small force F on any particle in the direction of the particle's motion. A particle of mass m projected upward takes time t1 in reaching the maximum height and t2 in the return journey to the original point. Then.
If you jump barefoot on a hard surface, your legs are injured. But they are not injured if you jump on a soft surface like sand or pillow. Why?
'When a hanging carpet is beaten with a stick, the dust particles start coming out of it'. This phenomenon can be best explained by making use of :
State Newton's first law of motion.
The amount of inertia of a body depends on its _________.
When a bus suddenly takes a tum, the passengers are thrown outwards because of
A balloon has mass of 10 g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm/s. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne).
