When an object of height 4cm is placed at 40cm from a mirror the mirror forms the image on the object itself. If the height of the image is equal to the height of the object. Find out the focal length of the mirror and identify the mirror. A convergent beam of light passes through … Continue reading Numerical Problems From Optics

# Tag: numerical problems

# The problem of a rock thrown vertically up

A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does it go b. how much time is required for the rock to reach its maximum height? c. what is the rock’s height at t=2.00s? (Posted by Merhawi) Answer: (a) u=15m/s a=-10m/s2 v=0 m/s [...]

# A Numerical from Combination of thin lenses in contact

Two thin lenses of focal lengths f1=20cm and f2=60cm are placed in contact. find the focal length f3 of the combined lenses. find also the focal length f of a third lens placed in contact with these two that would result in overall focal length f11=-40cm. (Asked Young) Incoming search terms:class 9 science sample paper for [...]

# A Numerical Problem from Mechanics

A rock explodes and is split into three pieces. two of them moves in direction of perpendicular to each other. One piece of mass 1kg moves with velocity of 5m/s and second piece of mass 2kg moves with velocity of 13m/s. find mass of third piece. (Tayade Kishore S asked) Incoming search terms:numerical problems [...]

# Numerical Problems based on Newton’s Laws

1.A machine gun has a mass of 20 kg. it fires 30g bullets at the rate of 400 bullets per second with a speed of 400 m/s. what force must be applied to the gun to keep it in position? 2.A ball of mass 20g hits a wall at an angle of 45 degree with … Continue reading Numerical Problems based on Newton’s Laws

# Revision and Practice Materials for Plus Two Physics – Capacitance

Important concepts and formulas from CAPACITANCE capacitors conceptual questions and solutions Unsolved Numerical Problems for Practice from CAPACITANCE Solved Numerical Problems from CAPACITANCE