Question 4741:

A potential difference of \(6 \mathrm{~V}\) is used to produce a current of \(5 \mathrm{~A}\) for 200s through a beating coil. The heat produced is ____________

A. \(4800 \mathrm{cal}\)
B. \(6000 \mathrm{cal}\)
C. \(2400 \mathrm{~J}\)
D. \(240 \mathrm{kcal}\)
E. 6000] equation

Question 4742:

A weight of 1000grams hangs from a lever 20cm to the right of the fulcrum. At the left is a 500-gram weight 20 cm from the fulcrum, and a 200-gram x cm from the fulcrum. What is the value of x that will make the lever balanced?

A. 50cm
B. 20 cm
C. 10cm
D. 30 cm

Question 4743:

In a harmonic oscillation of a simple pendulum, one of the following statements is correct

A. The potential energy and the kinetic energy of the bob are equal at all times
B. The potential energy is equal to the kinetic energy at the central position of the oscillation
C. The potential and the kinetic energies of the bob are maximum at the maximum height of the oscillation
D. None of the above

Question 4744:

If the linear expansivity of a metal rod is \(4 \times 10^{-5}\) per \({ }^{\circ} C\), what will be the new length of the rod if it is heated from \(15^{\circ} C\) to \(95^{\circ} C\) from its original length of \(20 cm\)

A. \(0.064 cm\)
B. \(0.64 cm\)
C. \(20.64 cm\)
D. \(20.064 cm\)

Question 4745:

The heat required to melt ice at \(0^{\circ} C\) to water at the same temperature is called ____________

A. Apparent heat of fusion
B. Apparent heat of vaporization
C. Latent heat of vaporization
D. Latent heat of fusion