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Firdavs [7]
3 years ago
6

Consider each of the following processes. Would the calculated value of ∆E for the system be a positive or negative answer? a. W

ater warms up when left in the sun (system = water) b. A gas is compressed. (system = the gas) c. A hot object cools when left out. (system = the object) d. In a car engine, a mixture of air and fuel combusts and expands, pushing the piston. (system = the cylinder of the engine)
Physics
2 answers:
kotykmax [81]3 years ago
7 0

Answer:

a. positive

b. positive

c. negative

d. positive

Explanation:

The Entropy (E) of  a system represents the degree of disorderliness of a system. The entropy of a system is directly proportional to the temperature of the system.

<em>As water warms up, the temperature of the water increases and the entropy increases. Hence, change in entropy is positive.</em>

<em>The random movement of molecules in a gas that is compressed increases and forces such as friction generates heat into the system, leading to an increase in entropy.</em>

<em>A hot object that cools down when left out loses heat and this leads to a reduction in entropy and hence, a negative entropy change.</em>

<em>Combustion within an engine generally generates heat and leads to an increased entropy. Hence, combustion leads to a positive change in entropy.</em>

Andrej [43]3 years ago
3 0

Answer:

a) positive bc the surroundings are losing heat

b) positive

c) negative bc the surroundings are gaining heat

d) negative bc work is done by the system

Explanation:

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Explain the function and the difference between figure 1 and 2
natita [175]

Answer:

figure one (step up transformer) helps in increasing the output voltage

figure two (step down transformer) helps in decreasing the output voltage

8 0
2 years ago
an astronaut weighs 8.00x10^2 on the surface of earth. what is the weight of the astronaut 6.37x10^6 meters above the surface of
Marta_Voda [28]
To solve this problem, we use the Law of Universal Gravitation:

F = Gm1m2/d^2

where m1 and m2 are two objects. In this case, earth and man. d is the distance between the objects. Lastly, G is the gravitational constant. Since the mass of the earth and man are constant, this is lumped up with G into k. The equation would be:

F = k/d^2
k = Fd^2
F_{1} d_{1} ^{2} =F_{2} d_{2} ^{2}

The radius of earth, d1, is equal to 6.371E+6 m. Thus, d2 = 2d1

(8E+2)(d1)^2 = F2(2d1)^2

(8E+2)(d1)^2 = 4F2(d1)^2

(8E+2)=4F2
F2 = 200 Newtons
4 0
3 years ago
PLEASE HELP!!! DUE TOMORROW
Dmitry_Shevchenko [17]
Thermal energy measures the total kinetic energy of the particles in a substance. The greater the motion of particles, the higher a substance's temperature and thermal energy. A substance's total thermal energy depends on its temperature, number of atoms, and physical state.
6 0
3 years ago
A 11 547,83-N car is raised using a hydraulic lift, which
kati45 [8]

Answer:

75457.54816 N

Explanation:

F_1 = Initial force

F_2 = Weight of car = 11547.83 N

r_1 = Smaller radius = 5 cm

r_2 = Larger radius = 19.56 cm

From Pascal's law we have

\dfrac{F_1}{A_1}=\dfrac{F_2}{A_2}\\\Rightarrow F_1=F_2\dfrac{A_1}{A_2}\\\Rightarrow F_1=11547.83\dfrac{\pi r_1^2}{\pi r_2^2}\\\Rightarrow F_1=11547.83\dfrac{5^2}{19.56^2}\\\Rightarrow F_1=754.57548\ N

The force is 754.57548 N

3 0
4 years ago
How many mm equal 14m
Fed [463]

Answer:

14000 mm

Explanation:

multiply the length value by 1000

3 0
4 years ago
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