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inna [77]
3 years ago
10

HElP I NEED TO turn this in

Physics
1 answer:
Alexeev081 [22]3 years ago
8 0
B student 2 because you add
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The average lifetime of a poodle dog is 13.0 years. How fast is it traveling, u, relative to an observer who measures the averag
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Answer:

The speed is 0.97 c.

Explanation:

Given that,

Dilated time t'= 50.0 years

Rest time t = 13.0 years

We need to calculate the speed

Using formula of time dilation

t'=\dfrac{t}{\sqrt{1-\dfrac{v^2}{c^2}}}

Where, t' = change in time

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v = velocity

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Put the value into the formula

50.0=\dfrac{13.0}{\sqrt{1-\dfrac{v^2}{(3\times10^{8})^2}}}

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v^2= 0.9324c^2

v=0.97c

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An airplane travels 1200 km in 90 minutes. What is the average speed in m/s for this trip?
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According to most car mechanics, plain water is the best coolant to use in an engine provided the engine is not being exposed to
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A car with speed v and an identical car with speed 2v both travel the same circular section of an unbanked road. If the friction
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Answer:

F'=\dfrac{F}{4}

Explanation:

Let m is the mass of both cars. The first car is moving with speed v and the other car is moving with speed 2v. The only force acting on both cars is the centripetal force.

For faster car on the road,

F=\dfrac{mv^2}{r}

v = 2v

F=\dfrac{m(2v)^2}{r}

F=4\dfrac{m(v)^2}{r}..........(1)

For the slower car on the road,

F'=\dfrac{mv^2}{r}............(2)

Equation (1) becomes,

F=4F'

F'=\dfrac{F}{4}

So, the frictional force required to keep the slower car on the road without skidding is one fourth of the faster car.

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