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2 years ago

Can someone help me please

Physics

2 answers:

xeze [42]2 years ago

6 0

Electrical energy is transformed into chemical energy

katen-ka-za [31]2 years ago

3 0

I think its thermal it may not be......

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A 243 mL cup of whole milk contains about 45 mg of cholesterol. Express the cholesterol concentration of the milk in kilograms p

timama [110]

Answer: $0.1851 \frac{kg}{m^{3}}$

Explanation:

We have this concentration in units of $mg/ml$ :

$\frac{45 mg}{243 ml}$

And we need to express it in $kg/m^{3}$ , knowing:

$1 ml= 1 cm^{3}$

$1 m^{3}= (100 cm) ^{3}$

$1g = 1000 mg$

$1 kg = 1000 g$

Hence:

$\frac{45 mg}{243 cm^{3}} \frac{1 g}{1000 mg} \frac{1 kg}{1000 g} \frac{(100 cm) ^{3}}{1 m^{3}}=0.1851 \frac{kg}{m^{3}}$

5 0

3 years ago

A heat engine has three quarters the thermal efficiency of a carnot engine operating between temperatures of 65Â°C and 435Â°C if

const2013 [10]

Answer:

The value is $P_e = 31275.2 \ W$

Explanation:

From the question we are told that

The efficiency of the carnot engine is $\eta$

The efficiency of a heat engine is $k = \frac{3}{4} * \eta$

The operating temperatures of the carnot engine is $T_1 = 65 ^oC =338 \ K$ to $T_2 = 435 ^oC = 708 \ K$

The rate at which the heat engine absorbs energy is $P = 44.0 kW = 44.0 *10^{3} \ W$

Generally the efficiency of the carnot engine is mathematically represented as

$\eta = [ 1 - \frac{T_1 }{T_2} ]$

=> $\eta = [ \frac{T_2 - T_1}{T_2} ]$

=> $\eta = 0.3856$

Generally the efficiency of the heat engine is

$k = \frac{3}{4} * 0.3856$

=> $k = 0.2892$

Generally the efficiency of the heat engine is also mathematically represented as

$k = \frac{W}{P}$

Here W is the work done which is mathematically represented as

$W = P - P_e$

Here $P_e$ is the heat exhausted

$k = \frac{P - P_e}{P}$

=> $0.2892 = \frac{44*10^{3} - P_e}{44*10^{3}}$

=> $P_e = 31275.2 \ W$

8 0

2 years ago

Plz help me find the answers

san4es73 [151]

Answer: Plastids are the site of manufacture and storage of important chemical compounds used by the cells of autotrophic eukaryotes

Explanation:

6 0

2 years ago

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What invisible force will cause you to fall to the earth if you fall off your bed?

Katyanochek1 [597]

Answer:

The answer to this is falling all the way through the Earth is impossible, since its core is molten. ... As you approached the center of the earth the pull of gravity would decline and eventually (at the center) cease, but inertia would keep you going.

Explanation:

your welcome

8 0

3 years ago

The three branches of science are ____, earth, and physical

Rom4ik [11]

The three branches of science are life, earth, and physical science.
Life science deals with living organisms, so, biology is the most important of these sciences, although there are many.
Earth science deals with Planet Earth, studying its atmosphere, lithosphere, etc.
Physical science studies the inorganic world.

5 0

3 years ago

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