projectiles

Projectiles

A bullet is to be fired with a speed of 1000 m/sec to hit a target 200 m away on a horizontal level If g=10 m/sec2 At what height (h) the gun should be hold to fire and hit the target?

200 m
h





For a projectile, time taken to cover the horizontal distance = time taken to cover the vertical height as free fall
 ie time taken to cover 200 m = time for free falling h m
 time =distance / speed ( for uniform motion in the horizontal direction)
 t=200 ÷ 1000 =0.2 sec
 by  Newtons equations of motion
 h=ut+½gt2
 u=0 (. . . free fall)
 h=0+½ ×10 × 0.04= 0.2 m
 ie the gun must hold at a height of 20 cm above the target

Prepared by Sai’s Classes Poonkunnam Thrissur +919846088761

Comments

Post a Comment

Popular posts from this blog

Hyperbolic Paraboloid

Image
Graphs and Level curves of functions of Two variables Definitions The set of points (x,y) in the plane where a function f (x,y) has a constant value f(x,y)=c is called a level curve of f The set of all points (x,y,f (x,y)) in space, for (x,y) in the domain of f, is called the graph of f The graph of f is called the surface z=f (x,y) The equation of the following hyperbolic paraboloid is `z=50+x^2-y^2`
Read more

Renewable Energy-Solar

The conventional energy sources are depleting at an exponential  rate .The energy crisis is a major concern for the nation around. The coal will last long only for 100 years or less petroleum resource will be exhausted nearly in 50 years time. The oil producing countries it self is moving towards the introduction of renewable energy sources , major among them is Solar energy. The energy production in the sun is  by the  nuclear fusion , hydrogen in the core of sun is converting in to heavier nucleus helium during this process the nuclear binding energy is liberating in the form useful energy . The plants can absorb the visible light and utilize it  for photosynthesis . The use of solar energy by natural means is coming only 1 to 2 % , rest of the energy is un utilized The solar energy capturing technique (Photo Voltaic) was introduced by Charles Fritts   in the year 1883 The solar energy can be  utilized in the following ways 1.  ...
Read more