Question
$4200\, J$ of work is required for
✓
Answer
(b) Work done to raise the temperature of $100\,gm$ water through $10°C$ is
$W = JQ = 4.2 \times (100 \times {10^{ - 3}} \times 1000 \times 10) = 4200\,J$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In an ammeter, $5 \%$ of the main current passes through the galvanometer. If resistance of the galvanometer is G, the resistance of ammeter will be :
→$Assertion$: In the measurement of physical quantities direct and indirect methods are used.
→$Reason$ : The accuracy and precision of measuring instruments along with errors in measurements should be taken into account, while expressing the result.
A charge of total amount $Q$ is distributed over two concentric hollow spheres of radii $r$ and $R ( R > r)$ such that the surface charge densities on the two spheres are equal. The electric potential at the common centre is
→Two parallel slits $0.6 \,mm$ apart are illuminated by light source of wavelength $6000 Å$. The distance between two consecutive dark fringes on a screen $1 \,m$ away from the slits is
→An $LC$ circuit contains a $20\,\,mH$ inductor and a $50\,\,\mu F$ capacitor with an initial charge of $10 \,\,mC.$ The resistance of the circuit is negligible. Let the instant the circuit is closed be $t = 0.$ At what time is the energy stored completely magnetic $t=$ .......... $m/s$
→What physical quantities may $X$ and $Y$ represent ? ($Y$ represents the first mentioned quantity)
→In $L-C-R$ circuit if resistance increases, quality factor
→The diagonals of a parallelogram are $2\,\hat i$ and $2\hat j.$What is the area of the parallelogram.........$units$
→$S_1$ and $S_2$ are two equipotential surfaces on which the potentials are not equal. Which of the statement is incorrect ?
→The charge given to a hollow sphere of radius $10\, cm$ is $3.2×10^{-19}\, coulomb$. At a distance of $4\, cm$ from its centre, the electric potential will be
→