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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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Explanation:

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1300 m east = 1300 i

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Drops the penny from a cliff 640 m high = -640 k

Displacement of penny = 1300 i + 2400 j - 640 k

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saveliy_v [14]

Answer:

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Explanation:

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3 years ago

Do the math: How many seconds would it take an echo sounder’s ping to make the trip from a ship to the Challenger Deep (10,994 m

Lera25 [3.4K]

Answer:

Explanation:

Given the formula for calculating the depth in metres expressed as

depth in meters = ½ (1500 m/sec × Echo travel time in seconds)

Given depth of the challenger = 10, 994 meters, we will substitute this given value into the formula given to calculate the time take for the echo to travel.

10, 994 = depth in meters = ½ * 1500 m/sec × Echo travel time in seconds

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Dividing both sides by 750;

Echo travel time in seconds = 10,994 /750

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3 years ago

A car travel with a constant velocity of 20.5m/s for 20seconds what distance does it cover in this time ?

prohojiy [21]

Answer:

410 m

Explanation:

Given:

v₀ = 20.5 m/s

a = 0 m/s²

t = 20 s

Find: Δx

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Δx = (20.5 m/s) (20 s) + ½ (0 m/s²) (20 s)²

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Natasha2012 [34]

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And so, the current through the circuit is (using Ohm's law):

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And since the two bulbs are connected in series, the current through each bulb is the same.

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The power dissipated by each bulb is given by the formula:

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For the first bulb:

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$P_{tot} = P_1 + P_2 = 4 W + 8 W=12 W$

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