The fiqure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40\(^o\), then the value of W is
In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80\(^o\)C is known as the
In the figure, the value of R is
Which of the following instruments consumes the highest current?
|
I. Electric iron II. Television set III. Torchlight IV. Immersion heater |
250v 220v 6v 110v |
1kW 110W 30W 500W |
In which of the following diagrams is the length of the tube equal to one wavelength?
