2 years ago

Why is the inner core a dense ball of solid metal?

Physics

1 answer:

Zielflug [23.3K]2 years ago

4 0

Answer:

so dont mind this it just said the answer have to be 20 words long (the answer should be B)

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the illuminance on a surface is 6 lux and the surface is 4 meters from the light source. What is the intensity of the saurce?

Lelechka [254]

L = illuminance
A = surface
i = intensity

L = i / A ==: i = L * A

i = 6 lux * 4 m^2 = 24 lumen

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An assault rifle fires an eight-shot burst in 0.40 s. Each bullet has a mass of 7.5 g and a speed of 300 m/s as it leaves the gu

myrzilka [38]

Answer:

The average recoil force on the gun during that 0.40 s burst is 45 N.

Explanation:

Mass of each bullet, m = 7.5 g = 0.0075 kg

Speed of the bullet, v = 300 m/s

Time, t = 0.4 s

The change in momentum of an object is equal to impulse delivered. So,

$F\times t=mv\\\\F=\dfrac{mv}{t}$

For 8 shot burst, average recoil force on the gun is :

$F=\dfrac{8mv}{t}\\\\F=\dfrac{7.5}{1000}\cdot\dfrac{300}{0.4}\cdot8\\\\F=45\ N$

So, the average recoil force on the gun during that 0.40 s burst is 45 N.

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2 years ago

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3 years ago

What is the average speed of a bowling ball that travels a distance of 5.0 m in 2.58 seconds?

Gre4nikov [31]

Answer:

1.94 m/s (2dp)

Explanation:

Speed= Distance/Time

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