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3 years ago

15

the distance between 2 station is 5400 m find the time taken by a train to cover this distance, if the train travels with speed

60m/s

2 answers:

iragen [17]3 years ago

8 0

Answer:

I dont know bro

Explanation:

Ask an expert

strojnjashka [21]3 years ago

5 0

Answer:

Time=90s

Explanation:

Speed=distance /time

$60 = \frac{5400}{t} where \: t \: is \: time \\60t = 5400 \\ t = \frac{5400}{60} \\ t =90 \\ hope \: this \: helps..good \: luck$

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11. A plow pushes 100 kg of snow with 300 N of force. How much is the pile of snow<br> accelerated?

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2 years ago

Plain electromagnetic wave (in air) has a frequency of 1 MHz and its B-field amplitude is 9 nT a. What is the wavelength in air?

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Answer:

Part a)

$\lambda = 300 m$

Part b)

$E = 2.7 N/C$

Part c)

$I = 9.68 \times 10^{-3} W/m^2$

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Explanation:

Part a)

As we know that frequency = 1 MHz

speed of electromagnetic wave is same as speed of light

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Part b)

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$E = Bc$

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Part c)

Intensity of wave is given as

$I = \frac{1}{2}\epsilon_0E^2c$

$I = \frac{1}{2}(8.85 \times 10^{-12})(2.7)^2(3\times 10^8)$

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Pressure is defined as ratio of intensity and speed

$P = \frac{I}{c} = \frac{9.68\times 10^{-3}}{3\times 10^8}$

$P = 3.22 \times 10^{-11} N/m^2$

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