To throw the discus, the thrower holds it with a fully outstretched arm. Starting from rest, he begins to turn with a constant a
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Answer:
Explanation:
consider the radio wave which is electro magnetic wave used for radio communication.
- the wave propagates for air or vacuum.
- the wave presented by air is a transverse wave
- the radio wave speed is constant that is, equals to the speed of light as it is now electromagnetic waves.
- now the general relationship between frequency, speed and wavelength is given by
c = v/
= c/v
Answer:
The time taken by the personal computer to 'surf' the internet is 11.13 h.
Explanation:
The expression for the energy in terms of current and time is as follows;
E= Vit
Here, V is the potential, i is the current and t is the time.
According to question, in doing a load of clothes, a clothes drier uses 18 A of current at 240 V for 41 min.
Convert time from minute to second.
Calculate the energy used by the clothes drier.
Put V= 240 V, and i=18 A in the expression for the energy.
E'= 2937.6 W
Therefore, the energy of a clothes drier is E'= 2937.6 W.
It is given in the problem that a personal computer, in contrast, uses 2.2 A of current at 120 V. With the energy used by the clothes drier, this computer is used to surf the internet.
Calculate the time taken by the computer to 'surf' the internet.
E'=V'i't'
Here, V' is the voltage used by the a personal computer, i' is the current and t' is the time taken by the personal computer.
Put E'= 2937.6 W, V= 120 V and i'= 2.2 A.
2937.6 = (120)(2.2)t'
t'= 11.13 h
Therefore, the time taken by the personal computer to 'surf' the internet is 11.13 h.