Given below are the four cases in which certain heat transfer is taking place:
1. Ice is melting in a glass full of water
2. Water is boiling in an open container
3. A metal rod is heated in a furnace
4. A cup of coffee is allowed to cool on a table
In which of the above cases, the Newton's Law of Cooling is applicable ?
The figure given below shows the direction of the two forces P and Q acting on a skydiver :
Which one among the following statements is correct about the two forces?
An infinite combination of resistors, each having resistance $R = 4 \Omega$, is given below. What is the net resistance between the points A and B? (Each resistance is of equal value, $R = 4 \Omega$)
An electric circuit is given below. $V_1 = 1 V$ and Resistance $R = 1000 \Omega$.
The current through the resistance $R$ is very close to $1$ mA and the voltage across point A and B, $V_{AB} = 1 V$. Now the circuit is changed to :
where value of $V_2 = 5 V$. The internal resistances of both the batteries are $0.1 \Omega$. The current through the resistance $R$ is about :