Questions asked by Jay P.

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• In this reaction 2Al+3/2O2 formed Al2O3 ,9 gm of Al will react with how many gm of O2?
  
• 4 gms of hydrogen are ignited with 4 gms of oxygen. the weight of water formed ?
  
• If #|hata-hatb|=sqrt2# then calculate the value of #|hata+sqrt3hatb|#?
  
• If #|hata+hatb| =√3# then #|hata -hat b|# is?
  
• A man walk for some time T with velocity V due east .then he walks for same time T with velocity V due to north. the average velocity of the man is?
  
• The number of litres of air required to burn 8 litres of C2H2 is approximately?
  
• The wavelength of a photon in nm having energy of 3.083•10^12J is approximately?
  
• 25/3 m/s is ans? a particle is moving along positive X axis with uniform acceleration -2m/s. its initial velocity is 20m/s. calculate out average speed after 15 second
  
• A body with uniform acceleration travel distance 12m in the third second and 20metre in fifth second.find the velocity after 10th second?
  
• A particle moves along X direction with constant acceleration. it velocity after 4s is 18 m/s and displacement is 56m find out its initial velocity and acceleration?
  
• An object initially at rest moves along x axis subjected to an acceleration which varies with time according to relation a=2t+5 it initial velocity of particle is 5m/s then its velocity after 2 second will be?
  
• The ratio of the radii of first orbit of H, He+ and Li2+ is?
  
• A particle start from rest moved with constant acceleration for 15second. if it cover s1 distance in first 5second then distance s2 in next 10second ,then find the relation between s1 and s2?
  
• A body start from rest and with a uniform acceleration of 10m/s^2 for 5 second. during the next 10 second its moves with uniform velocity. the total distance travelled by the body its?
  
• A stone falling from the rest position. under the influence of gravity. it's strikes with a glass in time t loses half of it's velocity. if it then reached the ground in t seconds and gain velocity of 30m/s. find out time?
  
• A particle is projected upwards with velocity 60m/s. what will be the pathlenght after 8 second?
  
• A particle is projected horizontal with a speed of 20/√3m/s from some height at t=0. at what time will its velocity make 60degree angle with the initial velocity?
  
• A ball is thrown vertically upward with speed 65m/s . the distance covered by the in 7th sec is?
  
• at t=0 a projectile is fired from a point O on the ground with speed with a speed of 50m/s at an angle of 53° with the horizontal. it just passes two point A and B each at height 75m above horizontal.the horizontal separation between the point A and B?
  
• Please solve it?
  
• An elevator is accelerating upward at a rate of 6ft/sec^2 when a bolt from its ceiling falls to the floor of the lift at distance 9.5ft. the time taken by the falling bolt to hit the floor is (take g=32ft/sec^3)?
  
• A force acts on an object of mass 1.5kg at rest for 0.5s. After the force stops acting the object travels a distance of 5m in 2s. hence the magnitude of the force will be?
  
• An object of mass 3 kg is moving with a velocity of 5m/s along a straight. if a force of 12N is a applied for 3 seconds on the object in a perpendicular to it's direction of motion. the magnitude of velocity of the particle at the end of 3 seconds is m/s?
  
• A block of mass 5 kg is moving horizontally at a speed of 1.5m/s. a perpendicular force of 5N acts on it for 4sec. what will be the displacement of the block from the point when the force start acting?
  
• An object is thrown with a speed u at an angle of 60 degree to the horizontal. the time elapsed between the instants when its velocity vector makes 30degree with the horizontal is?
  
• A body projected with a speed v has its speed v/2 at the highest position of its trajectory. The maximum height attained by it is ?
  
• A ball was thrown from height H and the ball hit the floor with velocity #10(hati-hatj)# after 1.5 sec of its projection. find initial velocity of ball?
  
• A rain drop is falling with velocity #(2hati-4hatj)#m/s. what should be the velocity of a man so that rain drops hit him with speed 5m/s?
  
• A body of mass 5 kg is placed on a rough horizontal surface. if coefficient of friction is 1/√3 find what pulling force should act on the body at an angle 30 degree to the horizontal so that the body just begins to move?
  
• a body is in limiting equilibrium on a rough inclined plane at angle of 30degree with horizontal. calculate the acceleration with which the body will slide down when inclination of the plane is changed to 60degree.?
  
• A body of mass 10 kg is displaced from point a(2,1,3)to point b(3,3,4) under the effect of force of magnitude 20N in the direction of 6i+8j . calculate W.D by the force?
  
• Velocity of a particle varies with time as v=t^2-t-2. average speed of the particle in time interval from t=0 to t=4sec?
  
• A particle of mass m1 makes an elastic head on collision with a stationary particle of mass m2. the fraction of kinectic energy of m1 carried by m2?