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3 years ago

A tin containing 5 litres of paint has a mass of 8.5kg. The empty tin has a mass of 2.0kg. What is the density of the paint?

Physics

2 answers:

Alex3 years ago

6 0

2.5 density that’s what I think

sertanlavr [38]3 years ago

5 0

Answer:

The density is 1.3 kg per cubic meter

Explanation:

Density is mass divided by volume, so:

8.5-2 = mass of paint (kg)

5 = volume (L)

P = 6.5/5

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Korvikt [17]

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4 years ago

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Nastasia [14]

Answer:

(a) 0.33 second

(b) 6 cm/s

Explanation:

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3 years ago

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3 years ago

Read 2 more answers

LOTS OF POINTSA rocket of mass 40 000 kg takes off and flies to a height of 2.5 km as its engines produce 500 000 N of thrust.

Svetradugi [14.3K]

Answer:

i) E = 269 [MJ] ii)v = 116 [m/s]

Explanation:

This is a problem that encompasses the work and principle of energy conservation.

In this way, we establish the equation for the principle of conservation and energy.

$E_{k1}+W_{1-2}=E_{k2}\\where:\\E_{k1}= kinetic energy at moment 1\\W_{1-2}= work between moments 1 and 2.\\E_{k2}= kinetic energy at moment 2.$

$W_{1-2}= (F*d) - (m*g*h)\\W_{1-2}=(500000*2.5*10^3)-(40000*9.81*2.5*10^3)\\W_{1-2}= 269*10^6[J] or 269 [MJ]$

At that point the speed 1 is equal to zero, since the maximum height achieved was 2.5 [km]. So this calculated work corresponds to the energy of the rocket.

Er = 269*10^6[J]

ii ) With the energy calculated at the previous point, we can calculate the speed developed.

$E_{k2}=0.5*m*v^2\\269*10^6=0.5*40000*v^2\\v=\sqrt{\frac{269*10^6}{0.5*40000} }\\ v=116[m/s]$

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3 years ago

An isotope has a half-life of 25 days. If you start with 50 grams, how much of the substance

a_sh-v [17]

Answer:

12.5

Explanation:

If the half life is 25 days then in 50 days it will half twice

50/2=25

25/2=12.5

4 0

3 years ago

A tin containing 5 litres of paint has a mass of 8.5kg. The empty tin has a mass of 2.0kg. What is the density of the paint?​

A tin containing 5 litres of paint has a mass of 8.5kg. The empty tin has a mass of 2.0kg. What is the density of the paint?