Physics

Doppler effect – problems and solutions 1. (1) an observer moving toward the stationery source (2) source moving toward the stationary observer (3) observer and source approach each other (4) observer and source are moving at the same speed If the pitch heard is higher than that of the emitted source frequency, then which statement … Read more

Fluid dynamics – problems and solutions Torricelli’s theorem 1. A container filled with water and there is a hole, as shown in the figure below. If acceleration due to gravity is 10 ms-2, what is the speed of water through that hole? Known : Height (h) = 85 cm – 40 cm = 45 cm … Read more

Fluid statics – problems and solutions Liquid pressure 1. What is the difference between the hydrostatic pressure of blood between the brain and the soles of the feet of a person whose height 165 cm (suppose the density of blood = 1.0 × 103 kg/m3, acceleration due to gravity = 10 m/s2) Known : Height … Read more

Thermal expansion – problems and solutions Area expansion 1. A sheet of steel at 20oC has size as shown in the figure below. If the coefficient of linear expansion for steel is 10-5 oC-1 then what is the change in the area at 60oC. Known : Length of steel = 40 cm Width of steel … Read more

Momentum – problems and solutions 1. 0.5-kg ball moves at 2 m/s. Then the ball is hit with force F opposite to the ball direction, so the ball speed is changed to 6 m/s. The ball in contact with a hitter for 0.01 second, what is the change in momentum of the ball. Known : … Read more

Conservation of mechanical energy – problems and solutions 1. An m-kg block is released from the top of the smooth inclined plane, as shown in the figure below. Comparison between the gravitational potential energy and kinetic energy of the block at point M is… Solution Gravitational potential energy at point M : PEM = m … Read more

Impulse – problems and solutions 1. A 0.5 kg ball free fall from a height of h1 = 7.2 meters and reflected a height of h2 = 3.2 meters. Acceleration due to gravity = 10 m/s2. Determine impulse. Known : Mass of ball (m) = 0.5 kg First height (h1) = 7.2 meter Second height … Read more

Impulse Momentum Collisions – Problems and Solutions 1. A 40-gram rubber bullet shot horizontally to the wall, as shown in the figure below. The bullet is reflected at the same speed. What is the change in momentum of the ball? Known : Mass (m) = 40 gram = 0.04 kg Initial velocity (vo) = – … Read more

Intensity of sound – problems and solutions 1. Point A and B located at 4 meters and 9 meters from a source of the sound. If IA and IB are intensity at point A and point B, then IA : IB =… Known : The distance of point A from a source of sound (rA) … Read more

Inclined plane – problems and solutions 1. Mass of block is 5 kg, acceleration due to gravity = 9.8 m/s2, tan 37 o = 3/4. What is the acceleration of the block? Solution Known : mass (m) = 5 kg acceleration due to gravity (g) = 10 m/s2 weight (w) = m g = (5)(10) … Read more