In an explosion, an internal impulse acts in order to propel the parts of a system (often a single object) into a variety of directions. After the explosion, the individual parts of the system (that is often a collection of fragments from the original object) have momentum.
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What is the equation for an explosion?
Again using the equation mass = moles times molar mass, the molar mass of the explosive can be calculated as 12a + b + 14c + 16d. Therefore the oxygen balance of Ca Hb Nc Od is 16d – 16(2a + b/2) all divided by 12a + b + 14c + 16d multiplied by 100%.
Is an explosion an elastic or inelastic collision?
An explosion is a special type of collision. It is a perfectly inelastic collision that seemingly happens in reverse. Before the ‘collision’, all objects are stuck together. After the ‘collision’, all objects are moving apart from one another.
What physics quantities are conserved during an explosion?
Explosions occur when energy is transformed from one kind e.g. chemical potential energy to another e.g. heat energy or kinetic energy extremely quickly. So, like in inelastic collisions, total kinetic energy is not conserved in explosions. But total momentum is always conserved.
How do you calculate explosion power?
The efficiency of an explosive is measured by its relative explosive power, REP. This quantity is defined as REP = QVg/m2, where Q is the energy released in the explosion, Vg is the total volume (at STP) of gas produced, and m is the mass of the explosive that has reacted.
How do you calculate the pressure of an explosion?
The peak explosion pressure on the borehole wall is calculated as(3) P r = n · P b where Pr is the peak explosion pressure on the borehole wall, n is the shock wave collision pressure increase ratio (n = 8–11), and it generally takes n = 8.
What is an explosion in physics momentum?
An object being fired from a cannon is also a collision where momentum must be conserved. As the momentum before the ‘collision’ is zero, the momentum after the collision is zero. In physics, this type of event is termed an explosion.
What are 3 types of collisions?
What is explosion give example?
An explosion is a sudden, violent burst of energy, for example one caused by a bomb. A second explosion came minutes later and we were enveloped in a dust cloud. Three people have been killed in a bomb explosion in northwest Spain. Synonyms: blast, crack, burst, bang More Synonyms of explosion.
What will happen if two cars with the same mass collide with each other?
Imagine the reverse of the explosion that we just discussed. Both carts come towards each other in a head-on collision. If both carts have the same masses and speeds then they will both come to rest after they hit the Velcro pads. This collision is completely inelastic: all the kinetic energy disappears.
Do explosions conserve momentum?
What happens when two objects collide and stick together?
An inelastic collision is one in which objects stick together after impact, and kinetic energy is not conserved. This lack of conservation means that the forces between colliding objects may convert kinetic energy to other forms of energy, such as potential energy or thermal energy.
What elements can cause explosions?
Peroxides (inorganic), when mixed with combustible materials, barium, sodium, and potassium, form explosives that ignite easily. Phosphorus (P), both red and white, forms explosive mixtures with oxidizing agents.
When a bomb at rest explodes into two equal parts then each part will move in?
If a bomb at rest explodes and splits into two equal fragments, the fragments will move in. one direction and with equal velocities.
Does kinetic energy increase in an explosion?
Collisions are considered inelastic when kinetic energy is not conserved, but this could be from either a loss or gain or kinetic energy. For example, in an explosion-type collision, the kinetic energy increases.
What PSI is lethal?
Exposure to pressure levels greater than 550 kPa (79.8 psi) is lethal in more than 50% of cases (Figure 7-2 and Figure 7-3).
Why do you open your mouth during an explosion?
Explosions create waves of increased pressure, followed by negative pressure, which can be extremely damaging to ears and internal organs. Keeping ones mouth open is said to equalize pressure, therefore reducing internal damage.
What causes the greatest damage in an explosion?
The air blast shock wave is the primary damage mechanism in an explosion.
Can C4 be detonated underwater?
C4 is waterproof and may be used underwater if necessary. C4 is easily and reliably initiated by L1A2, or L2A2 detonators, detonating cord L5A1 or Detonating Cord Boosters (DCB). A Chemring Europe company, part of the Chemring Group.
Why can you feel an explosion before you hear it?
A pressure wave can travel through solids at a greater speed than through air. And this means a “pre sound” can reach you before the shock wave does – as the motion of the ground will in turn induce a sound wave in the adjacent air.
How does water affect an explosion?
Particularly, in case of a confined explosion, water has the potential to mitigate the shock pressure as well as the gas pressure loading developed inside the structure confining the explosion. In case a high explosive detonates, a high pressure blast wave will be generated which moves outward in all directions.
What is the opposite of explosion?
Implosion is a process in which objects are destroyed by collapsing (or being squeezed in) on themselves. The opposite of explosion (which expands the volume), implosion reduces the volume occupied and concentrates matter and energy.
Why is the total momentum of an exploding bomb zero before and after the explosion?
This is because the internal forces all occur in equal and opposite pairs (Newton’s 3rd Law). If we take the external forces into account, then momentum is not conserved. Even during the brief explosion, the bomb and its fragments are being accelerated downwards by gravity.
What is Ke formula?
Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.
What are the 3 impacts during a motor vehicle crash?
Impact is defined as an instance when something is struck with force. The three types of impact that occur (in succession) are those involving the vehicle, the body of the vehicle occupant, and the organs within the body of the occupant.