Answer:
The resistance of the motor is 8.91 ohms.
Explanation:
Given that,
Voltage of the socket, V = 120 V
Current, I = 2.4 A
Back emf generated by the electric motor is, E = 98.6 V
We need to find the coil resistance of the motor. The new emf on the vacuum cleaner is
The resistance of the motor is given by :
So, the resistance of the motor is 8.91 ohms. Hence, this is the required solution.
Answer:
4.36 seconds
Explanation:
According to the question;
- Force is 550 N
- Mass of the car is 1200 kg
- Velocity of the car is 2.0 m/s
We are needed to find the time the car must the tow track pull the car.
- From Newton's second law of motion;
- Impulsive force, F = Mv÷t , where m is the mass, v is the velocity and t is the time.
Rearranging the formula;
t = mv ÷ F
Thus;
Time = (1200 kg × 2.0 m/s²) ÷ 550 N
= 4.36 seconds
Thus, the time needed to pull the car is 4.36 seconds
<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:
177.213 grams
Explanation:
Given:
Total amount of water = 364 grams
Latent heat of fusion = 333 kJ/kg
Heat transferred = 62.2 kJ
The amount of water frozen = 62.2/333 = 0.186786 kg = 186.786 grams
Hence, the amount of water remained unfrozen = Total water - Amount of water frozen
the amount of water remained unfrozen = 364 grams - 186.786 grams = 177.213 grams
