3 years ago

3. A motorbike travels 45 miles in 15 minutes, what is its speed?

Physics

1 answer:

antiseptic1488 [7]3 years ago

3 0

Hes going 180 mph
oof...

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Manuel traveled 3 hours nonstop to Mexico, a total of 197 miles. He took a train part of the way, which averaged 70mph, and t

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Answer:

1.7 hours

Explanation:

Time taken in the journey = 3 hours

Distance of the entire journey = 197 miles

Distance travelled on train = x

Distance travelled on bus = 197-x

Average speed of train = 70 mph

Average speed of bus = 60 mph

Time = Distance / Speed

$\frac{x}{70}+\frac{197-x}{60}=3\\\Rightarrow \frac{6x+1379-7x}{420}=3\\\Rightarrow -x+1379=3\times 420\\\Rightarrow -x=1260-1379\\\Rightarrow x=119\ miles$

Distance travelled by train = 119 miles

Time taken on train = 119 / 70 = 1.7 hours

Manuel spent 1.7 hours on the train

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3 years ago

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Yakvenalex [24]

Answer:

Radio waves

Explanation:

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A brick falls from 12 m scaffolding. What is the final velocity of the brick if it was initially at rest? How much time passes d

Rama09 [41]

Answer:

Final velocity is 39.2 m/s and it travels 78.4 m/s

Explanation:

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3 years ago

53. A recently discovered planet has a mass four times as great as Earth's and a radius twice as large as Earth's. What will be

marusya05 [52]

Answer:

$g' = g = 9.81 m/s^2$

so gravity will be same as that of surface of earth

Explanation:

As we know that the acceleration due to gravity is given as

$g = \frac{GM}{R^2}$

here we have

$M = 4M_e$

$R = 2R_e$

we know that for earth we have

$g = 9.81 = \frac{GM_e}{R_e^2}$

now if the radius and mass is given as above

$g' = \frac{G(4M_e)}{(2R_e)^2}$

$g' = \frac{GM_e}{R_e^2}$

$g' = g = 9.81 m/s^2$

so gravity will be same as that of surface of earth

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3 years ago

Why is a steam burn more damaging than a burn from boiling water at the same temperature?

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The phase change (from gas to liquid) that the steam undergoes right when it touches your skin releases a lot of energy right onto your skin so it burns a ton. The boiling water would just burn you until it reaches the same temperature as your skin.

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3 years ago