#isc physics

eduphysics CBSE AND NEET Click here New Field Submit Δ   What is spring constant? – significance, formula, unit, dimension & numerical WHAT IS SPRING CONSTANT? Hooke’s law of elasticity Spring constant(k) is the constant of proportionality or the amount of energy delivered proportionality in the Hooke’s law experimental trial. Stronger or stiffer springs will have higher spring constant.…

Question: Three blocks of masses 6 Kg, 3 Kg and 1 Kg are connected with light string kept on a smooth surface. A horizontal force F= 14 N is applied as shown below.Calculate the tension in each string. Tension in each string in a connected mass Solution: To identify the forces acting on each mass: Gravitational force on the 6 Kg mass acting downward. Gravitational force on the 3 Kg mass…

Question: Two bodies of masses 15 kg and 10 kg are connected with light string kept on a smooth surface. A horizontal force F=500 N is applied to a 15 kg as shown in the figure.Calculate the tension acting in the string. String tension in connected masses Solution: To identify the forces acting on each mass: Gravitational force on the 15 kg mass acting downward. Gravitational force on the…

Question: A cyclist speeding at 18 Kmh-1 on a level road takes a sharp turn of radius 3 m without reducing the speed.The coefficient of friction between the tyre and the road is 0.1.Will the cyclist slip while taking the turn? Solution: Cyclist sharp turn Centripetal Force: Centripetal force acts inwards pulling the cyclist towards the centre of the turn.It depends on the cyclist’s speed and…

Question: A cricketer can throw a ball to a maximum horizontal distance of 100 m. How much high above the ground can the cricketer throw the same ball? Solution:Calculating the maximum height of the ball Projectile motion: Projectile motion with examples Maximum horizontal distance(Range): Maximum horizontal range of the projectile Maximum range is attained when the ball is projected at an…

Question: A mass of 4 Kg rests on a horizontal plane.The plane is gradually inclined until an angle 15o with the horizontal, the mass just begins to slide.What is the coefficient of static friction between the block and the surface. Solution: Coefficient of static friction Coefficient of static friction Mass of the block 4 Kg Angle of inclination $${\theta=15^\circ}$$ At a particular angle…

Question: A car moving in a straight line at 30 ms-1 slows uniformly to a speed of 10 ms-1 in 5 sec.Determine the (a) Acceleration of the car (b) Displacement in the third second Solution: (a) Acceleration of the car Initial velocity of the car u=30 ms-1 Final velocity of the car v=10 ms-1 Time taken t = 5 sec $${Acceleration =\frac{change \ in \ velocity}{time \…

Question: A car moving along a straight highway with speed of 126 Kmh-1 is brought to a stop within a distance of 200 m. What is the retardation of the car (assumed uniform), and how long does it take for the car to stop? Solution: Initial velocity of the car u =126 Kmh-1 Converting the velocity into meter per second $${126\frac{Km}{Hr}}={126\frac {(1000 \ m)}{(3600 \ s)}} ={126…