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3241004551 [841]
2 years ago
12

suppose a scientist found a new matal-like substance in the desert. He determined its mass to be 20 grams. The volume was determ

ined by water displacement to be 5 cm^3. What is the density of the substance? Will it sink or float in liquid water ( 1g/cm^3)?
Physics
1 answer:
lys-0071 [83]2 years ago
6 0

Density = (mass) / (volume)

Density = (20 g) / (5 cm³)

<em>Density = 4 g/cm³</em> .

The density of the substance is greater than the density of water. A lump of the substance <em>will sink in water</em>, <u>unless</u> the lump is formed into a shape that displaces 20 cm³ of water or more, such as a tiny boat shape.

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A block of mass
Gennadij [26K]

(a) The work done by the applied force is 26.65 J.

(b) The work done by the normal force exerted by the table is 0.

(c) The work done by the force of gravity is 0.

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<h3>Work done by the applied force</h3>

W = Fdcosθ

W = 14 x 2.1 x cos25

W = 26.65 J

<h3>Work done by the normal force</h3>

W = Fₙd

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W = (2.5 x 9.8) x cos(90) x 2.1

W = 0 J

<h3>Work done force of gravity</h3>

The work done by force of gravity is also zero, since the weight is at 90⁰ to the displacement.

<h3> Work done by the net force on the block</h3>

∑W = 0 + 26.65 J = 26.65 J

Thus, the work done by the applied force is 26.65 J.

The work done by the normal force exerted by the table is 0.

The work done by the force of gravity is 0.

The work done by the net force on the block is 26.65 J.

Learn more about work done here: brainly.com/question/8119756

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How high would you have to lift a 1000kg car to give it a potential energy of:
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Given parameters:

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Unknown:

Height  = ?

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          P.E  = mgh

m is the mass

g is the acceleration due to gravity = 9.8m/s²

h is the height of the car

Now the unknown is h, height and we make it the subject of the expression to make for easy calculation.

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<u>For 2.0 x 10³ J;</u>

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<u>For 2.0 x 10⁵ J;</u>

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<u>For 1.0kJ  = 1 x 10³J; </u>

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What is the monthly cost of using a 750 W refrigerator that runs for 8 hours every day, if the cost per kWh is $0.23?
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Answer:

Assuming there are 28 days in each month,

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