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3 years ago

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An object will sink in a liquid if the density of the object is greater than that of the liquid. The mass of a sphere is 9.83 g.

If the volume of this sphere is less than ________ cm3, then the sphere will sink in liquid mercury (density

1 answer:

Talja [164]3 years ago

5 0

I don't know

I need more information

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Is energy transformation from potential to kinetic 100%?

Arada [10]

Yes. take a bow for instance. while pulling back the string you have potential energy. when you let the string go and the arrow flies towards your target the string is filled with kinetic energy.

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3 years ago

When a block of ice at zero degrees Celsius melts, the ice A) absorbs energy from its environment. B) releases energy to its env

Mariulka [41]

Answer: Option (E) is the correct answer.

Explanation:

Latent heat is defined as the amount of heat required by per mole of a substance in order to change its state.

And, latent heat of freezing (fusion) is defined as the energy required for the phase change between a liquid and a solid without any change in their temperature.

Therefore, at zero degrees Celsius energy absorbed by the ice will be consumed in breaking the bond between the water molecules held together in the solid state.

Thus, we can conclude that when a block of ice at zero degrees Celsius melts, the ice absorbs energy but does not change its temperature.

3 0

3 years ago

How does the ringing sound of a telephone travels from the phone to your ears?

Sedaia [141]

The "ringing sound" are actually the soundwaves travelling from the phone to your ears.

6 0

3 years ago

Potassium is a crucial element for the healthy operation of the human body. Potassium occurs naturally in our environment and th

Mariulka [41]

Answer:

a) 0.0288 grams

b) $2.6*10^{-10} J/kg$

Explanation:

Given that:

A typical human body contains about 3.0 grams of Potassium per kilogram of body mass

The abundance for the three isotopes are:

Potassium-39, Potassium-40, and Potassium-41 with abundances are 93.26%, 0.012% and 6.728% respectively.

a)

Thus; a person with a mass of 80 kg will posses = 80 × 3 = 240 grams of potassium.

However, the amount of potassium that is present in such person is :

0.012% × 240 grams

= 0.012/100 × 240 grams

= 0.0288 grams

b)

the effective dose (in Sieverts) per year due to Potassium-40 in an 80- kg body is calculate as follows:

First the Dose in (Gy) = $\frac{energy \ absorbed }{mass \ of \ the \ body}$

= $\frac{1.10*10^6*1.6*10^{-14}}{80}$

= $2.2*10^{-10} \ J/kg$

Effective dose (Sv) = RBE × Dose in Gy

Effective dose (Sv) = $1.2 *2.2*10^{-10} \ J/kg$

Effective dose (Sv) = $2.6*10^{-10} J/kg$

5 0

4 years ago

WRONG ANSWERS WILL BE REPORTED

Dmitry_Shevchenko [17]

The answer to number 9 is C, decreased muscle tension. I believe number 10 is D, prepares an organism to respond to stress.

7 0

3 years ago