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Ludmilka [50]
4 years ago
9

What are the units for density and when do you use each

Physics
1 answer:
Delicious77 [7]4 years ago
8 0

Every unit of density is

(a unit of mass) divided by (a unit of volume) .

The one most widely used is [ gram/cubic centimeter ] , but there's no reason that you MUST use this same unit every time you talk about density. You can use (any unit of mass) divided by (any unit of volume) that you want ... the best choices are always the ones that end up with the most convenient number.

Whatever units of mass and volume you decide to use, it's easy for anybody to convert it to [ gram/cubic centimeter ] if they want to.

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Which of the following statements is false?
astraxan [27]

Answer:

c. Kinetic energy is conserved in all collisions .

Explanation:

the total kinetic energy of system of particles involved in the collision does changes .

kinetic energy is not conserved in all collisions because in some cases energy is converted to another form of energy that is heat etc .

5 0
4 years ago
A heat engine has a maximum possible efficiency of 0.780. If it operates between a deep lake with a constant temperature of-24.8
Volgvan

Answer : The temperature of the hot reservoir (in Kelvins) is 1128.18 K

Explanation :

Efficiency of carnot heat engine : It is the ratio of work done by the system to the system to the amount of heat transferred to the system at the higher temperature.

Formula used for efficiency of the heat engine.

\eta =1-\frac{T_c}{T_h}

where,

\eta = efficiency = 0.780

T_h = Temperature of hot reservoir = ?

T_c = Temperature of cold reservoir = -24.8^oC=273+(-24.8)=248.2K

Now put all the given values in the above expression, we get:

\eta =1-\frac{T_c}{T_h}

0.780=1-\frac{248.2K}{T_h}

T_h=1128.18K

Therefore, the temperature of the hot reservoir (in Kelvins) is 1128.18 K

8 0
3 years ago
I just need an answer ASAP
nikdorinn [45]

Answer: c

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2 years ago
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Answer:

He=3 H=6 O=6

Explanation:

8 0
3 years ago
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