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3 years ago

What is the amount of "stuff in an object?

Physics

2 answers:

ziro4ka [17]3 years ago

7 0

mass is the amount of "stuff in an object

Andrei [34K]3 years ago

4 0

Good question. The amount of 'stuff' in an object is it's mass.

A fundamental distinction we learn in physics is the difference between mass and weight. If we were in deep space, away from any very large objects of mass (like a planet), we would be 'weightless' e.g. not feel the effects of gravity, but we would not be 'massless'. Our mass doesn't change based upon our proximity to large objects (gravitational attraction), but the sense of weight does.

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Which type of drug would be useful in dilating the pupils for an examination of the retina? Which type of drug would be useful i

givi [52]

Answer:

muscarinic receptor inhibitor

Explanation:

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3 years ago

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Imagine two billiard balls on a pool table. Ball A has a mass of 2 kilograms and ball B has a mass of 3 kilograms. The initial v

Orlov [11]

1. After the collision, their velocities have switched. This is Newton's third law of motion.

2. The total momentum is conserved.

3. The same thing would happen if the collision is totally elastic.

For 4 and 5.
Using the conservation of momentum equation
m1v1 + m2v2 = m1'v1' + m2'v2'<span />

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3 years ago

The mass of earth 6*10^24kg its radius is 6.4*10^3km now calculate due to gravity on earth<br>

irga5000 [103]

Answer:

Explanation:

in your textbook, they have a formula like this:

g=mass of earth*G/R^2

G=6.67*10^-11

apply to this

we have g=6*10^2*4*6.67*10^-11/(6.4*10^3*1000)^2=9.78

7 0

3 years ago

A star with the same mass and diameter as the sun rotates about a central axis with a period of about 24.0 days. Suppose that th

Mila [183]

Answer:

a) w = 2.52 10⁷ rad / s, b) K / K₀ = 1.19 10⁴

Explanation:

a) We can solve this exercise using the conservation of angular momentum.

Initial instant. Before collapse

L₀ = I₀ w₀

Final moment. After the collapse

L_f = I w

angular momentum is conserved

L₀ = L_f

I₀ w₀ = I w (1)

The moment of inertia of a sphere is

I = 2/5 m r²

we take from the table the mass and diameter of the star

m = 1,991 10³⁰ kg

r₀ = 6.96 10⁸ m

r = 6.37 10⁶ m

to find the angular velocity let's use

w = L / T

where the length of a circle is

L = 2π r

T = 24 days (24 h / 1 day) (3600 s / 1h) = 2.0710⁶ s

we substitute

w = 2π r / T

wo = 2π 6.96 10⁸ / 2.07 10⁶

wo = 2.1126 10³ rad / s

we substitute in equation 1

w = $\frac{I_o}{I}$

w = 2/5 mr₀² / 2/5 m r² w₀

w = ( $\frac{r_o}{r}$ ) ² wo

w = (6.96 10⁸ / 6.37 10⁶) ² 2.1126 10³

w = 2.52 10⁷ rad / s

b) the kinetic energy ratio

K = ½ m w²

K₀ = ½ m w₀²

K = ½ m w²

K / K₀ = (w / wo) ²

K / K₀ = 2.52 10⁷ / 2.1126 10³

K / K₀ = 1.19 10⁴

7 0

3 years ago

What is true about a ferromagnetic material? its magnetic domains are constantly aligned. its north pole is stronger than its so

madam [21]

Th answer is it could gain or loss magnetism.

Ferromagnetism is a kind of magnetism that is associated with cobalt, iron, and nickel and on some alloys or compounds containing one or more of the said elements, It also occurs in gadolinium, which is a rare-earth element. In comparison to other substances, ferromagnetic materials can be magnetized easily and in strong magnetic fields, the magnetization approaches a definite limit called stauration.

If an external field is applied and subsequently removed which does not return the magnetization to its original state or value it is called hysteresis. When heated to a certain temperature (Curie point), which is unique for each substance, ferromagnetic materials would somehow lose their magnetic properties and cease to be magnetic. Once they would cool down, their magnetism would return.

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3 years ago

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