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2 years ago

How much kinetic energy does a roller coaster have if its mass is 3000 kg and is moving at 30 m/s

1 answer:

3 0

The Kinetic energy of an object is given by:
$E_k= \frac{1}{2}mv^2$

Where m is the mass of the object (kg) and v is the velocity of the object (ms-1)

Substituting in:
$E_k= \frac{1}{2}*3000*30^2 = 1350000J$
Therefore the Kinetic energy of the object is 1.35MJ

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Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. (a) How fa

zloy xaker [14]

Answer:

150000000000 m

0.0000005 seconds

33.33 ns

Explanation:

Speed of electromagnetic waves through vacuum = $3\times 10^8\ m/s$

Echo time = 1000 seconds

Echo time is the time taken to reach the object and come back to the observer

Distance = Speed×Time

$Distance=3\times 10^8\times \frac{1000}{2}=150000000000\ m$

Venus is 150000000000 m away from Earth

Time = Distance / Speed

$Time=\frac{75}{3\times 10^8}=0.00000025\ seconds$

Echo time will be twice the time

$Echo\ time=2\times 0.00000025=0.0000005\ seconds$

The echo time will be 0.0000005 seconds

Difference in time = Difference in distance / Speed

$\Delta t=\frac{\Delta d}{v}\\\Rightarrow \Delta t=\frac{10}{3\times 10^8}\\\Rightarrow \Delta=33.33\ ns$

The accuracy by which I will be able to measure the echo time is 33.33 ns

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3 years ago

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denpristay [2]

Answer:

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miss Akunina [59]

Hello!

Answer:

When a gas gets hot it should go up because of the pressure.

Explanation:

Hope this helps!

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3 years ago

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