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Vesna [10]
3 years ago
8

If light moves at a speed of 299,792,458 m/s, how long will it take light to move a distance of 1,000 km

Physics
1 answer:
astra-53 [7]3 years ago
6 0

Answer:

change 1000km into Metre

1000km=1000000 M

speed= distance/time

time=distance/speed

time=1000000/299792458

time= 0.0033second

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A 1400.0 kg car crests a 3200.0 m pass in the mountains and briefly comes to rest. The car descends 1000 m before climbing and c
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Answer:

a) v = 88.54 m/s

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Explanation:

Given that;

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a)

by using the energy conservation

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5488000 = 700v²

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v² = 7840

v = √7840

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b)

Work done by all forces is equal to change in KE

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1400 × 9.8 × ( 3200-2800) - (5 × 10⁶) = 1/2 × 1400 × (vf²  -0 )

488000 = 700 vf²

vf² = 488000 / 700

vf² = 697.1428

vf = √697.1428

vf = 26.4 m/s

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