<h2>ANSWER: </h2><h2>_____________________________________</h2><h2>TYPES OF CHEMICAL REACTIONS:</h2>
There are two types of Reactions,
<h3>
Endothermic Reactions: </h3>
Endothermic reactions are the type chemical reaction in which the reactants absorb heat energy from the surroundings. The energy of reactants is more than the energy of product
<h3>Exothermic Reactions: </h3>
Exothermic reactions are the type of chemical reactions in which release of energy takes place in the form of heat or light. In an exothermic reaction, energy is released. The energy of the products is less than the energy of the reactants.
<h2>_____________________________________</h2><h3 /><h3>In Question number 5,</h3>
The key word is "RELEASE". The reaction in which energy is released is the Exothermic reaction thus the Option B that is EXOTHERMIC REACTION is correct.
<h2>_____________________________________</h2><h3 /><h3>In Question number 6</h3>
It is asking that which process stores the energy that means it is asking which process undergoes endothermic reaction. The answer is Option C that is PHOTOSYNTHESIS is correct.
<h3>__________________________________________________</h3><h3>WHY PHOTOSYNTHESIS?</h3>
Because, sunlight is being absorbed during the reaction and according to the definition of endothermic reaction if heat is being absorbed it is termed as an endothermic reaction.
<h3>__________________________________________________</h3><h3 /><h3 />
Answer:
B: Electrical - Heat
C: Electrical - kinetic
Explanation:
When the hair dryer is plugged to electric supply, electrical energy is converted into heat. When this electricity is circulated through a resistor, heat is now created in the form of losses which make the air around the resistors to be heated.
After that process, this electricity turns into kinetic energy because it forms Electric energy which moves the fan in order to create a flow with the air that's heated.
Answer:
m = 0.4005 kg/s
Q_out = 45.1 KJ/s
Explanation:
Given
Pipe inlet diameter D1 = 16 cm
Steam inlet pressure P1 = 2 Mpa
Steam inlet temperature T1 = 300 °C
Pipe outlet diameter D2 = 14 cm
Steam inlet velocity V1 = 2.5 m/s
Steam outlet pressure P2 = 1.8 MPa
Steam outlet temperature T2 = 250 °C
Required
Determine
(a) The mass flow rate of steam.
(b) The rate of heat transfer.
Assumptions
Kinetic and potential energy changes are negligible.
This is a steady flow process.
There is no work interaction.
Solution
Part a From steam table (A-6) at P1 = 2 Mpa , T1 = 300 °C
vl = 0.12551 m^3/Kg
h1 = 3024.2 KJ/Kg
The mass flow rate of steam could be defined as the following
m = 1/v1*A1*V1
m = 0.4005 kg/s
Part b We take the pipe as our system.The energy balance could be defined as the following
E_in -E_out =ΔE_sys = 0
E_in = E_out
mh_1 = Q_out + mh_2
Q_out = m(h_1-h_2)
From steam table (A-6) at P2= 1.8 Mpa T2 = 250 °C h2= 2911.7 KJ/Kg The heat transfer could be defined as the following
Q_out = m(h_1-h_2)
Q_out = 0.4005*(3024.2 -2911.7) =45.1 KJ/s
Answer:
The value is 
Explanation:
From the question we are told that
The radius of curvature is 
Generally the radius of curvature is mathematically represented as
Here 
is the focal length hence
=> 
=>
The electrostatic energy stored in a capacitor with capacitance
, with a voltage difference V applied to it, and without dielectric, is given by
Now let's assume we fill the space between the two plates of the capacitor with a dielectric with constant k. The new capacitance of the capacitor is
So, the energy stored now is
Therefore, the ratio between the energies stored in the capacitor before and after the introduction of the dielectric is
