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3 years ago

When do spring tides occur?

Chemistry

1 answer:

USPshnik [31]3 years ago

5 0

The correct answers are:

1. C. during a new Moon;

The spring tides occur twice a month, after new Moon, and after full Moon. They cause the biggest differences in the high and low tides, with the high tides being abnormally high, and the low tides being abnormally low.

2. C. perigee;

The perigee is the point at which the Moon is closest to the Earth. This happens because the Earth is not right in the middle of the Moon's revolution, thus making one part of it being closer, and other part being further away.

3. C. sunrise;

The Moon has no influence on the sunrise whatsoever. The sunrise depends only on the movement of the Earth in comparison to the Sun, with the part is the becoming exposed to it as the Earth rotates being the part that is experiencing the sunrise.

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A certain heat engine operates between 800 K and 300 K. (a) What is the maximum efficiency of the engine? (b) Calculate the maxi

Sholpan [36]

Answer :

(a) The maximum efficiency of the engine is, 62.5 %

(b) The maximum work done is, 0.625 KJ.

(c) The heat discharge into the cold sink is, 0.375 KJ.

Explanation : Given,

Temperature of hot body $T_h$ = 800 K

Temperature of cold body $T_c$ = 300 K

(a) First we have to calculate the maximum efficiency of the engine.

Formula used for efficiency of the engine.

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

Now put all the given values in this formula, we get :

$\eta =1-\frac{300K}{800K}$

$\eta =0.625\times 100=62.5\%$

(b) Now we have to calculate the maximum work done.

Formula used :

$\eta =\frac{Q_h-Q_c}{Q_h}=\frac{w}{Q_h}$

where,

$Q_h$ = heat supplied by hot source = 1 KJ

$Q_c$ = heat supplied by hot source

w = work done = ?

Now put all the given values in this formula, we get :

$\eta =\frac{w}{Q_h}$

$0.625=\frac{w}{1KJ}$

$w=0.625KJ$

(c) Now we have to calculate the heat discharge into the cold sink.

Formula used :

$w=Q_h-Q_c$

$Q_c=Q_h-w$

$Q_c=1-0.625$

$Q_c=0.375KJ$

Therefore, (a) The maximum efficiency of the engine is, 62.5 %

(b) The maximum work done is, 0.625 KJ.

(c) The heat discharge into the cold sink is, 0.375 KJ.

4 0

4 years ago

Help....................

Ray Of Light [21]

Total cost: $603.42

Tickets (total): 134.23*4= $536.92

603.42-536.92= $66.50

Hot dog (total)= $9

66.5-9= $57.50

Popcorn (total)= $17.50

57.50-17.50= $40

They bought 2 parking passes

40/2=20

Answer: Each pass costs $20

4 0

4 years ago

If the spheres represent a potassium atom and a potassium ion, which best represents the ion?

saul85 [17]

If the potassium ions were represented by spheres, the smaller one is the ion and the bigger one is the (neutral) atom.

Generally, metallic atoms (such as potassium) readily form cations (positively-charged ions) by losing electrons in their outer shells. By losing these electrons, the atoms are expected to be smaller in size. However for nonmetals, they readily gain electrons to form anions (negatively-charged ions). By gaining these electrons in their outer orbital shells, the ions generally then becomes larger.

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3 years ago

Which of these best describes the state of the substance represented by State Z?

romanna [79]

A) it is a solid because strong attractive forces prevent particles from moving.

7 0

3 years ago

classify each of the statements about gases as true or false. oxygen molecules at 25 celsius are moving faster than oxygen

AleksandrR [38]

Since gas molecules average velocity depends on temperature, oxygen molecules at 25°C are moving faster than oxygen molecules at 0 °C.

According to the kinetic theory of gases, the molecules of a gas are in constant random motion and collide frequently with each other and the walls of the container.

The average speed of gas molecules depends on temperature and molar mass as shown by the relation;

vrms = √3RT/M

The following statement are true among the options provided;

Oxygen molecules at 25°C are moving faster than oxygen molecules at 0 °C
Gases exert pressure by colliding with container walls

The following are false among the options provided;

All hydrogen molecules are moving with the same velocity
Nitrogen gas exerts more pressure than hydrogen gas because nitrogen molecules are heavier than hydrogen molecules.
Nitrogen molecules remain suspended in the atmosphere because they are not attracted to Earth by gravitational forces.

Learn more: brainly.com/question/6505878

7 0

3 years ago