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Dafna11 [192]
3 years ago
13

A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is rho. You now enlarge t

he sphere so its radius is 2R and completely fill it with the same liquid. What is the density of the enlarged sphere?
Physics
1 answer:
Mandarinka [93]3 years ago
5 0

The density is still rho. It doesn't change. The density of a substance is the density of the substance. It doesn't depend on how much of it you have.

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(V2 – V.), what do<br> 6 Label In the equation a =<br> V, and v, represent?
Orlov [11]

Answer:

Explanation: represends a=v

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Can a body moving at constant speed have acceleration ?​
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2 years ago
A 1000 kg car moving at 108 km/h jams on its brakes and comes to a stop. How much work was done by friction?
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Answer:

The work done by friction was -4.5\times10^{5}\ J

Explanation:

Given that,

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Initial speed of car =108 km/h =30 m/s

When the car is stop by brakes.

Then, final speed of car will be zero.

We need to calculate the work done by friction

Using formula of work done

W=\Delta KE

W=K.E_{f}-K.E_{i}

W=\dfrac{1}{2}mv_{f}^2-\dfrac{1}{2}mv_{f}^2

Put the value of m and v

W=0-\dfrac{1}{2}\times1000\times(30)^2

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3 0
3 years ago
Because of interstellar dust, astronomers can see at most about 5 kpc into the disk of the galaxy at visual wavelengths. What pe
NNADVOKAT [17]

Answer:

96%

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A = πR^2 = π (25 kpc)^2

And let a be the area that astronomers are able to see:

a = πr^2 = π(5 kpc)^2

The percentage that can be seen is equal to 100 times the ratio of the areas, of the galaxy and the "visible" part:

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Therefore, the percentage of the galaxy not included, i.e. not seen is:

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3 years ago
A 1000.0 kg truck accelerates from 20.0 m/s to 25.0 m/s over a distance of 300.0 m. What is the average net force on the truck?
choli [55]

Answer:

The average net force on the truck is 375 Newtons.

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Using Newton's 3rd equation of motion, we have :

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3 0
3 years ago
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