Physics, 24.01.2020 19:31 elizabethivy75

You are driving home from school steadily at 95 km/h for 180 km. it then begins to rain and you slow to 65 km/h. you arrive home after driving for 4.5 h. a. how far is your hometown from school? b. what was your average speed?

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Answer from: leigha54

To solve this problem we will apply the linear motion kinematic equations, for this purpose we will define the time of each of the sections in which the speed is different. After determining the segments of these speeds we can calculate the average distance and the average speed. Our values are given as

x = 180 km

v = 95 km / h

Speed can be described as the displacement of a body per unit of time, and from that definition clearing the time we would have

$v = \frac{x}{t} \rightarrow t = \frac{x}{v}$

$v = \frac{180}{95}$

v = 1.89473 hrs

From the statement we have that the total time is 4.5, then he remaining time is

t' = T-t =4.5-1.89473 = 2.60526 hrs

When it starts to rain there is a phase change in the speed which is given by

v' = 65km/h

Then the distance travel in this velocity

x' = v ' t '

x' = 65*2.60526

x = 169.34 km

(a). Distance of your hometown from school ,

x " = x + x '

x'' = 180+169.34

x= 349.34 km

(b) The average speed

$V = \frac{x "}{ T}$

$v = \frac{349.34 km}{4.5 h}$

v = 77.63 km/ h

Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

Answer from: Quest

B) raising the temperature and reducing the volume of the gas.|-/

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You are driving home from school steadily at 95 km/h for 180 km. it then begins to rain and you slow...