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Change of State Change of State :- Matter typically exists in three states: solid, liquid and gas. When heat energy is supplied to a substance it changes from one state to another and the process is known as a change of state. Two normal changes of states are solid to liquid and liquid to gas…
Heating Curve A plot of temperature versus heat, showing the amount of heat energy a substance has absorbed with increasing temperature is called heating curve. To draw heating curve of a substance, it is taken in a closed container in order to isolate it from its surroundings and then it is observed that how…
Two Absolute scales X and Y Question :- Two absolute scales X and Y assigned numerical values 200 and 450 to the triple point of water. What is the relation between TX and TY? (A) 9Tx = 4TY (B) 4Tx = 9TY (C) Tx = 3TY (D) None of these Solution :- We are going to…
Rocket Propulsion is based on Newton’s third law & Law of conservation of linear momentum Rocket Propulsion is based on Newton’s third law and Law of Conservation of Linear Momentum. It is an example of Variable Mass System. Let Rate of ejection of gases from the rocket (r) = m0 = initial mass…
Variable Mass System Variable Mass System :- Generally mass of a system remains constant but there are some situations in which mass of a system changes and the study of motion of these systems is done using laws of motion. From Newton’s second law, …..(1) Now there are two cases : Case…
Conservation of momentum in collisions Consider a system of two particles A and B. Let the momentum of the particles before collision is and respectively and after collision let the momentum are and respectively. Let the particles are in contact for a small time Δt during collision. Using Newton’s second law, force on A…
A gun weighing 10 kg fires a bullet Question :- A gun weighing 10 kg fires a bullet of 20g with a velocity 250 m/s. With what velocity does the gun recoil? Solution :- Here M = 10 kg, m = 2g = 0.02 kg, v = 250 m/s, V = ? Applying the…
A bomb at rest explodes into three equal fragments Question :- A bomb at rest explodes into three equal fragments. Two fragments fly off at right angles with velocity 12 m/s and 9 m/s. If the explosion process occurs in 0.1 s, find out the average force acting on the third particle, if total mass of the bomb…
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A bomb at rest explodes When a bomb at rest explodes into some fragments, we can find the velocity of it’s fragments using Law of Conservation of Linear Momentum. Suppose a bomb at rest explodes into two pieces with their masses in the ratio 3 : 1. Let : 3 m = mass of…
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A bomb at rest splits into three identical parts Question :- A bomb at rest splits into three identical parts. If two pieces are moving at right angles to each other with same velocity v m/s, the velocity of third fragment is (A) v/√2 (B) v/2 (C) 2v (D) v√2 Solution :- Before splitting,…
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