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3 years ago

A 4.0 kg bird has 8.0 joules of kinetic energy how fast is it flying

Physics

1 answer:

poizon [28]3 years ago

3 0

Answer

The velocity of the bird is 2 m /sec .

Explanation:

The formula for kinetic energy is given by.

$Kinetic\ energy = \frac{1}{2}\ m\ v^{2}$

Where m is mass , v is the velocity .

As given

A 4.0 kg bird has 8.0 joules of kinetic energy .

m = 4.0 kg

K.E = 8.0 joules

Putting in the formula

$8.0 = \frac{1}{2}\times 4.0\times v^{2}$

$v^{2}= \frac{8.0\times 2}{4.0}$

$v^{2}= 2\times 2$

$v^{2}= 4$

$\sqrt{4} = 2$

Thus

v = 2 m/sec

Therefore the velocity of the bird is 2 m /sec .

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Answer:

b-testing

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3 years ago

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Answer:

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Explanation:

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3 years ago

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2 years ago

Read 2 more answers

A stone is dropped from the

ICE Princess25 [194]

Height=h=500m
Acceleration=g=10m/s^2
Initial velocity=u=0
Speed of sound=c=340m/s
TIME TAKEN BY STONE TO HIT WATER=t
Time taken by sound to hear back=T

Now

$\\ \sf\longmapsto h=ut+\dfrac{1}{2}gt^2$

$\\ \sf\longmapsto h=0t+\dfrac{1}{2}10t^2$

$\\ \sf\longmapsto 500=5t^2$

$\\ \sf\longmapsto t^2=100$

$\\ \sf\longmapsto t=10s$

Now

$\\ \sf\longmapsto h=cT$

$\\ \sf\longmapsto T=\dfrac{h}{c}$

$\\ \sf\longmapsto T=\dfrac{500}{340}$

$\\ \sf\longmapsto T=1.47\approx 1.5s$

Total time:-

$\\ \sf\longmapsto T_{net}=t+T=10+1.5=11.5s$

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2 years ago

A car moves along a curved road of diameter 2 km. If the maximum velocity for safe driving on this path is 30 m/s, at what angle

Leto [7]

The maximum velocity in a banked road, ignoring friction, is given by;

v = Sqrt (Rg tan ∅), where R = Radius of the curved road = 2*1000/2 = 1000 m, g = gravitational acceleration = 9.81 m/s^2, ∅ = Angle of bank.

Substituting;
30 m/s = Sqrt (1000*9.81*tan∅)
30^2 = 1000*9.81*tan∅
tan ∅ = (30^2)/(1000*9.81) = 0.0917
∅ = tan^-1(0.0917) = 5.24°

Therefore, the road has been banked at 5.24°.

4 0

3 years ago