Asked by Lim in Physics

can help me with this qns.

Q5. The live wire of a 240 V mains supply is protected by a 15A fuse, A 3.0 kW heater is connected to the supply. The arrangement is shown in Fig.5.1.
                 
  (a) Name the wires P, Q and R.
          Fully describe the function of the earth wire.

  (b) The user wishes to connect a 2.0 kW heater in parallel with the 3.0 kW heater shown in Fig.5.2. Discuss, using suitable calculations, whether this would be a sensible idea.
          

(c) The element in the heater is made of metal. Use kinetic theory to describe the effect on the atoms of the metal as the temperature rises.
   
 

Asked by Lim in Physics

Q. How the resistance of a filament lamp changes during the first 1.0 sec based on
        
           
          





how the resistance of lamp changes
 

Asked by Lim in Physics

can u help me with this qns. Thanks

Asked by Lim in Chemistry

two river pass by the Taj Mahal .the water sample from the two river were tested for PH.River Ahas a PHof 5while RiverBhas a PH of 9. Describe an experiment involving a chemical reaction, which can be conducted the differentiate between the two water samples

Asked by Lim in Chemistry

A colourless solution y was added to a conical flask containing 2.0cm cube dilute nitric acid .A PH probe was used to monitor the reaction .the graph below show the change in PHas solution Y was added suggest a possible identity of Y .explain your answer. it is PH14

Asked by Lim in Chemistry

Q which ph value solution has the highest electrical conductivity?
  1. 2.0
  2. 4.0
  3. 5.0
  4. 6.0
 

Asked by Al Shafiq in Math

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Asked by Jikookhobi in Physics

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Q1. (a) Magnesium oxide is used as a construction material because of its strength and the resistance. Its structure and physical properties are similar to those of sodium chloride. The lattice structure of magnesium oxide is shown here.

      (i) Explain why magnesium oxide is a solid at room temperature.

              

Asked by Jikookhobi in Physics

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Q(b). The ship travels at a constant speed of 4 m/s. When the force due to the tugs is removed, the ship slows down and comes to rest.

       Explain why, initially, the ship travels at a constant speed and then whey it comes to rest.

Q(c). The distance a ship travels before it comes to rest depends on the mass of the cargo in the ship. Suggest and explain how the stopping distance depends on the mass.
 
 

Asked by Jikookhobi in Physics

A pendulum consists or a metal sphere attached to a thin thread, as shown in Fig. 1.


When the thread is vertical, the metal sphere is at O. The metal sphere is moved from O to X and held in position X by a horizontal force F.
A student determines the time for one complete swing of the pendulum. She uses two methods.
In the first method, she measures the time for one complete swing.
In the second method, she measures the time for 20 complete swings and divides the total time by 20. Explain why the second method gives a more accurate result than the first method.

Asked by NURUL in Math

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Q.  The participants of a quiz are divided equally into two groups. In the first group, there are 20 more boys than girls. In the second group, there are 12 more girls than boys. 45% of all the participants are girls. 
How many participants are boys? 
 

Asked by NURUL in Math

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Asked by NURUL in Math

Lina wanted to buy a bag. She saw a red bag on sale at 15% discount and a blue bag at 20% discount. Both bags had the same original price before the discounts.


To buy the red bag, Lina would need $2.50 more than what she had. So Lina bought the blue bag. After that , she had $2 left.

(a) What was the original price of the red bag?

(b) How much money did Lina have at first?

Asked by NURUL in Math

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Asked by Fatina in Math

5/4 times 20

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