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2 years ago

How long will bus take to travel 150 km at an average speed of 40km/hr

Physics

1 answer:

romanna [79]2 years ago

7 0

Answer:

3.75 hours

Explanation:

By $v = \frac{d}{t}$

where v is the velocity (or speed in this case)

d is the distance travelled

t is the time taken

$t = \frac{150}{40}=3.75$
Therefore it takes 3.75 hours for the bus to travel 150 km and 40 km/hr.

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What is the relation between inertia and mass?

aleksandr82 [10.1K]

Answer:

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Explanation:

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3 years ago

A) A spaceship passes you at a speed of 0.800c. You measure its length to be 31.2 m .How long would it be when at rest?

rosijanka [135]

Answer:

$l_o =52 \ m$

$l = 37.13 \ LY$

Explanation:

From the question we are told that

The speed of the spaceship is $v = 0.800c$

Here c is the speed of light with value $c = 3.0*10^{8} \ m/s$

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The distance of the star for earth is $d = 145 \ light \ years$

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Generally the from the length contraction equation we have that

$l = l_o \sqrt{1 -[\frac{v}{c } ]}$

Now the when at rest the length is $l_o$

$l_o =\frac{l}{\sqrt{ 1 - \frac{v^2}{c^2 } } }$

$l_o =\frac{ 31.2 }{ \sqrt{1 - \frac{(0.800c ) ^2}{c^2} } }$

$l_o=52 \ m$

Considering b

Applying above equation

$l =l_o \sqrt{1 - [\frac{v}{c } ]}$

Here $l_o =145 \ LY(light \ years )$

$l=145 * \sqrt{1 - \frac{v_s^2}{c^2 } }$

$l =145 * \sqrt{ 1 - \frac{2.9 *10^{8}}{3.0*10^{8}} }$

$l = 37.13 \ LY$

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3 years ago

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Answer:

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Explanation:

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2 years ago

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3 years ago

What is the frequency of a wave that has a speed of 5 m/s and a wavelength of 0.5meter?

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Explanation:

frequency =speed/wavelength

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3 years ago