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Amanda [17]
3 years ago
13

The conversion of potential energy in coal into the kinetic energy that heats steam is an expression of: Answer the first law of

thermodynamics the second law of thermodynamics both laws neither law
Physics
1 answer:
erastova [34]3 years ago
7 0

Let me think about this........ correct me if I am wrong....... Laws of thermodynamics 1) Energy cannot be created nor destroyed. It is transferred. 2) All spontaneous reactions will increased the entropy of the universe (More disorder) 3) The entropy of the crystal lattice structure at 0 K is zero PE(coal) --> Steam(K.E) ................ This will increase entropy and also conversion of energy. So BOTH LAWS is my final answer. Wait...... I would like to use a lifelines...... I want to phone my Physical chem professor. *Ring Ring.........* Me: Hello, I wanted to make sure if I got the correct answer. Chem prof: You dont need my help, since you got the right answer. Me: WOOT!!!!!!!

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A competitive go-cart driver is traveling at a speed of 32m/s. He sees a caution flag go up and slows down at a rate of -1.5 m/s
djyliett [7]

Answer:

His final velocity is 15.8 m/s.

Step-by-step explanation:

Given:

Initial velocity of the driver is, u=32 m/s

Acceleration of the driver is, a=-1.5 m/s²

Time taken to reach final velocity is, t=10.8 s.

The final velocity is given using the Newton's equations of motion as:

v=u+at, where, v is the final velocity.

Now, plug in the given values and solve for v.

v=32-1.5(10.8)\\v=32-16.2=15.8\textrm{ m/s}

Therefore, his final velocity is 15.8 m/s.

5 0
3 years ago
HELP PLEAASE!!!You push against a steamer trunk with a force of 750 N at an angle of 25° with the horizontal . The trunk is on a
viva [34]
<span>your answer is m = 59 kg</span>
5 0
3 years ago
A 3.7-kg object is acted on by two forces. One of the forces is 11 N acting toward the
vitfil [10]

Answer:

F₂ = -7.3 N

Explanation:

Given that,

The mass of an object, m₁ = 3.7 kg

First force, F₁ = 11 N

The net acceleration of the object is 1 m/s².

We know that,

F₁+F₂ = ma

11+F₂ = (3.7)(1)

F₂ = 3.7-11

F₂ = -7.3 N

so, the other force is 7.3 N and it is acting in west direction.

7 0
2 years ago
An electric toaster is rated 1200 watts at 120 volts. what is the total electrical energy used to operate the toaster for 30 sec
Anarel [89]
Energy is calculated as power*time, so give the wattage of 1200 W (equivalent to 1200 Joules/second) and time of 30 seconds, multiplying these gives 36000 J or 36 kJ of electrical energy.

If electrical charge or current is needed: Power = voltage * current, so given the power of 1200 watts and voltage of 120 V, current is 1200 W / 120 V = 10 Amperes. Charge is calculated by multiplying 10 A*30 s = 300 C.
3 0
3 years ago
A car travels 1008km in 14 hours. What is the average speed of the car?
Montano1993 [528]

Answer:

72 km/hr. ...jshdhdhddjidididdiididudd

6 0
3 years ago
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