Physics
The image given below displays kilowatt-hour meter readings recorded at two distinct points in time.
Assuming a continuously running 2000 W air conditioner as the sole electrical device in use, calculate the time interval, in hours, between these two meter readings.
Related Questions
(a) Name the waves used for echo depth sounding.
(b) Give one reason for their use in the above application
(a) Refer to the diagram given below. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen?
(b) A glass lens always forms a virtual, erect and diminished image of an object kept in front of it. Identify the lens.
ABCDE is a regular pentagon with its centre of gravity at O. What will be the most probable position (W, X, Y, Z or O) of the new centre of gravity:
(a) if a piece of clay is attached at point A?
(b) if the pentagon is cut along the line PQ? (Of the remaining part DCBQPE)
A solid of mass 60 g at 100°C is placed in 150 g of water at 20°C. The final steady temperature is 25°C. Calculate the heat capacity of solid?
[sp. heat capacity of water = 4.2 J g-1 K-1 ]