Respiration is an exothermic reaction because it releases more energy than it absorbs in the form of heat to its surroundings. All such reactions require an initial energy input, known as 'activation energy', to start the reaction. In an exothermic reaction, the heat content 'q' is negative, showing the transfer of thermal energy from the system to its surroundings.
Respiration is an "exothermic reaction", which means it is a chemical reaction that releases energy in the form of heat to its surroundings. This is achieved through the catabolism of foods in your energy bar, which is an example of an exergonic reaction. This reaction absorbs some of the chemical energy stored in the food, turns it into molecules your body can use, and releases the excess energy into the surroundings. However, all chemical reactions, including exothermic and endothermic reactions, require a small amount of energy to activate them.
During an exothermic reaction, there is a net release of energy despite this initial energy input. The energy given off is more than the energy absorbed. This process represents the concept of 'activation energy', an energy barrier that needs to be overcome for the reaction to proceed. Therefore, the heat content, often represented as 'q', is negative in an exothermic reaction, indicating that the system gives off thermal energy to the surroundings, making the surrounding environment warmer.
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A. 5,362.56 N
B. 7,600.18 N
C. 6,700.56 N
D. 6,150.64 N
Answer:The answer for PF students is D.
Explanation:
Friction causes kinetic energy to be converted into thermal energy.
Friction causes kinetic energy to be converted into thermal energy, among other forms of energy. When an object is in motion and experiences friction, the work done by friction is negative, which reduces the object's kinetic energy. This converted energy is often released as heat.
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Answer:
option A
Explanation:
given,
momentum of blue car in west direction = Pa = 2 kg.m/s
momentum of red cart in east direction = Pb = 3 kg.m/s
total momentum of the two cart = ?
Pa = 2 Kg.m/s
Pb = -3 kg.m/s
Total momentum
P = Pa + Pb
P = 2 - 3
P = - 1 kg.m/s
hence, the total momentum of the two carts after the collision is 1.0 kg•m/s
The correct answer is option A