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Since the distance travelled by a boy (going to school and coming back from school) is equal. So, average speed = 2xy/(x + y) Average speed = (2 x 45 x 30)/(45 + 30) Average speed = (2 x 45 x 30)/75 = 36 km/hr
A wire loop in the shape of a square of side a carries a current I. If an infinitely long straight wire carrying the same current passes through the ...
Two tuning forks produce 4 beats per second. If one has a frequency of 256 Hz, the frequency of the other is:
The refractive index of glass is 1.5. What is the speed of light in glass?
(Speed of light in vacuum is 3.0 ×108 m s-1)
In a diatomic gas at ordinary temperatures, how many degrees of freedom contribute to internal energy?
A 220 V, 100 W bulb is connected to a 110 V source. Calculate the power consumed by the bulb
The time period of a simple pendulum depends on —
A meter stick moves along its length with a certain speed. The apparent length of the moving meter stick as measured by a stationary observer on the gr...
A soap bubble shows colours when illuminated with white light. This is due to –
When a liquid is heated in a container, which of the following processes primarily causes the heat transfer within the liquid?
Cathode rays when obstructed by metal cause emission of -
