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3 years ago

A metal ball has a mass of 2kg and a volume of 6 m3. What is its density

Physics

2 answers:

Lena [83]3 years ago

8 0

Answer: The answer is 333.3333 repeating

Explanation:

Divide the mass by the volume.

Whitepunk [10]3 years ago

7 0

Answer:

Density of the metal ball, $\rho=0.334\ kg/m^3$

Explanation:

It is given that,

Mass of the metal ball, m = 2 kg

Volume of the metal ball, $V=6\ m^3$

We need to find the density of the metal ball. The total mass divided by total volume of an substance is called its density. Its formula is given by :

$\rho=\dfrac{m}{V}$

$\rho=\dfrac{2\ kg}{6\ m^3}$

$\rho=0.334\ kg/m^3$

So, the density of the metal ball is $0.334\ kg/m^3$ . Hence, this is the required solution.

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3 years ago

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A proton moves from a location where V = 87 V to a spot where V = -40 V. (a) What is the change in the proton's kinetic energy?

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Answer: a) 127 eV; b) there is no change of kinetic energy.

Explanation: In order to explain this problem we have to use the change of potentail energy ( conservative field) is equal to changes in kinetic energy. So for the proton ther move to lower potential then they gain kinetic energy from the electric field. This means the electric force do work in this trayectory and then the protons increased changes its speed.

If we replace the proton by a electron we have a very different situaction, the electrons are located in a lower potental then they can not move to higher potential if any external force does work on the system.

In resumem, the electrons do not move from a point with V=87 to other point with V=-40 V. The electric force point to high potential so the electrons can not move to lower potential region (V=-40V).

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4 years ago

A 0.5 kg stone is raised from 1m to 2m height from the ground. what is the change in potential energy of the stone?

Usimov [2.4K]

Given: The mass of stone (m) = 0.5 kg

Raised from heights (h₁) = 1.0 m to (h₂) = 2.0 m

Acceleration due to gravity (g) = 9.8 m/s²

To find: The change in potential energy of the stone

Formula: The potential energy (P) = mgh

where, all alphabets are in their usual meanings.

Now, we shall calculate the change in potential energy of the stone

Δ P = P₂ - P₁ = mg (h₂ - h₁)

or, = 0.5 kg ×9.8 m/s² ×(2.0 m - 1.0 m)

or, = 4.9 J

Hence, the required change in the potential energy of the stone will be 4.9 J

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3 years ago

When an electron loses or gains a charge, it becomes?

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Answer:

It becomes an Ion with either positive or negative charge

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3 years ago

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A. How far does a 100-newton force have to move to do 1,000 joules

Aloiza [94]

Work done by a force is given as the product of force and the distance moved by the force.

Work done is the product of force and the distance moved by the the force.

Work done = Force × distance

Thus, distance required by the 100 N force is given as:

Distance = work done/force

Distance = 1000/100 = 10 m

Distance to be moved is 10 m.

Force applied = work done/ distance

Force applied by the hoist = 500/2

Force applied by the hoist = 250 N

Distance moved in one push-up = 25 cm = 0.25 m

Work done by the athlete after one push-up = 250 × 0.25 m

Work done by the athlete = 62.5 J

Distance moved by the force = 0 m

Work done = 500 × 0 = 0 N

Therefore, for work to be done, force has to move a distance.

Learn more about work done at: brainly.com/question/25573309

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2 years ago