Physics High School

which is a necessary part input for all heat engines?


A) Steam to act as a working substance

B) An energy source, such as fuel or electrticity

C) A device to generate electrticity

D) Luiqid water to act as a working substance

Answers

Answer 1
I believe the answer is B. An energy source such as fuel or electricity.
For example an energy source such as fuel or electricity. For example a heat source generates thermal energy that brings the working substance to the high temperature state. the working substance generates work in the working body of the engine while transferring heat to the colder sink until it reaches a low state of temperature.

Related Questions

It's a good idea to create your procedure so that it's written _____. A. on a computer B. after your conclusions C. with step-by-step instructions D. in a way other scientists can't understand

Answers

the answer is C. step by step

Answer:

C. with step-by-step instructions

Explanation:

In order to create a procedure that is well understood and easily readily one needs to draw step by step action of the event that can lead to the formation of the proper answer to the query, and help in forming a good ides and proper sentence, also one should try to avoid too many words and use a active voice and be proper explanation of the statements should be made.

What is the magnitude of the instantaneous velocity at 4.00 s?

Answers

.100(\:\rms)))$=2m/s (4)

The required magnitude of the instantaneous velocity at t = 4.00 s is 2 m/s.

What is velocity?

Velocity is defined as the rate of change in the position of an object with respect to time.

The displacement function of an object s(t) gives the position of the object at time t. To find the instantaneous velocity at a particular time t, we need to find the derivative of the displacement function with respect to time.

In this case, the displacement function is s(t) = 2t + 4. Taking the derivative with respect to time, we get,

v(t) = ds/dt = 2

This means that the instantaneous velocity of the object is constant and equal to 2 m/s at all times. Therefore, the magnitude of the instantaneous velocity at t = 4.00 s is 2 m/s.

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Complete question-

What is the measure of the magnitude of the instantaneous velocity at 4.00 s where displacement is a function of t, s = 2t + 4?

For the Doppler effect to occur ?

Answers

change of pitch that occurs due to a moving sound source

You throw a water balloon straight up with a velocity of 12 m/s. What is its maximum height?

Answers

Considering that the earth's gravitational pull of 9.8 m/s is applied, and there are no other outside forces, then the maximum height would be 2.2 meters.

This is found by subtracting the earth's gravitational pull from the velocity in which you threw the object.

An object dropped will hit the ground before an object that is thrown horizontally. true or false?

Answers

Without air resistance and assuming the earth is flat, false. Both will hit the ground at the same time.

Without air resistance and taking into account the curvature of the earth, true. The object dropped will hit the ground first.

With air resistance, it could be either way.

The correct answer is false.

Hope this helps! ;)


Nanotechnology and microtechnology devices are both very tiny. However, one property of nanotechnology distinguishes it from microtechnology. What is this unique property?

Answers

Nanotechnology deals with atomic, or rather molecular scales, as opposed to micro-technology which deals with mechanical and electrical devices. In addition, nanoscale is one-third of microscale.
The unique property of it is that nanotechnology deals with atomic, or rather molecular scales, as opposed to micro-technology which deals with mechanical and electrical devices. In addition, nanoscale is one-third of microscale. It deals with the very small and tiny particles that our naked eye cannot see.

((Psychology))According to Sternberg, consummate love includes:

A. attraction and low commitment.
B. intimacy, commitment, and passion.
C. passion, romance, and little responsibility.
D. passion and high commitment.

Answers

According to Sternberg, consummate love includes:

This is the answer:

B. intimacy, commitment, and passion

These three are the components of love in Sternberg's Triangular Theory of Love.

Hope this helps.

Answer:

The correct answer is B. According to Sternberg, consummate love includes intimacy, commitment, and passion.

Explanation:

The triangular love theory of the American psychologist Robert Sternberg characterizes love in an interpersonal relationship according to three different components, which are intimacy, passion and commitment:

-Intimacy, understood as those feelings within a relationship that promote the approach, the link, the connection and mainly the self-revelation. Or in other words, the affection towards another person that arises from feelings of closeness, affective bond and relationship, implies the desire to give, to receive, to share, and so on.

-Passion, as a state of intense desire for union with the other, as an expression of desires and needs, great sexual or romantic desire accompanied by psychological excitement.

-Commitment, the decision to love another person and the commitment to maintain that love. This component implies maintaining the relationship in good times and bad times

The electrician's main source of information about electrical installation rules and regulations is the

Answers

The main source of information is the National Electric Code or the NEC. However, always track changes and amendments to the national electric code as this is the same as any law or regulation. This is universal, however, some states or cities may have their own subset of regulations about the electric code for their residents.

What type of radiation can penetrate deepest into exposed materials?

Answers

Gamma radiation has the greatest penetrating power. Gamma Radiation can only be absorbed by a thick lead plate.  Gamma  will pass through 6 feet for steel-lined concrete and can give a lethal dose in as little as 20 minutes.  Gamma rays are the most penetrating, being able to travel through a few meters of lead.

A plane traveling at a constant speed is able to travel 600 miles in 5 hours. how fast was the plane flying?

Answers

600 ÷5 = 120mph
120mph

Is true that the earth's crust is made up of many tectonic plates?

Answers

Yes, it is true. In the 20th century, researchers realized that the Earth's crust is not one piece, but is made up of many huge tectonic plates upon which the continents ride.

The type of mass movement where rock fragments become airborne is:

Answers

The type of mass movement where rock fragments become airborne is Rock Avalanches (airborne).   Rock Avalanches is most spectacular - at 125miles/hr rapid sliding and falling - capacity to become airborne cuts avalanche chute to be repeatedly used, forms talus (debris deposit at angle of repose).

One hypothesis states that plate movement results from convection currents in the a. inner core. c. lithosphere. b. asthenosphere. d. outer core.

Answers

One hypothesis states that plate movement results from convection currents in the asthenosphere.

From an ethical standpoint, which best describes why new biotechnology products should be tested extensively before they are allowed to be used?

(2 points)

There can be unintended consequences to many new biotechnology products.

Many new products end up being more expensive than they appear to be.

Biotechnology products tend to stop working after a few years.

There are usually no benefits to the products of biotechnology.

Answers

Its actually A. I did the same question and A was the correct answer.

There can be unintended consequences to many new biotechnology products so they should be tested extensively before allowed to be used. Option A is correct.

Biotechnology:

It is a field of science that use principles of technology and biology to improve the human lives.

For example-

Vaccines are produced by using the principles of biotechnology.Immunotherapy drugs are also produced by the biotech companies.The effect of biotechnology products in a long term manner cannot be predicted.

Therefore, there can be unintended consequences to many new biotechnology products so they should be tested extensively before allowed to be used.

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-Select ALL that apply-
Absolute zero is ___.

A. 0K
B. –40oC
C. –273oF
D. –273oC
E. the temperature at which water freezes
F. the temperature at which motion is at a minimum

Answers

The correct options are:
A) 0 K
F) the temperature at which motion is at a minimum

In fact, absolute zero corresponds to zero degrees in the Kelvin scale: 0 K. At this temperature, the motion of the molecules of any substance is minimum (it is zero, to be precise).

(note: there are some weird signs in the answers. if there is a negative sign in front of [tex]273^{\circ}C[/tex] in option D), then option D is correct as well, because [tex]0 K =-273^{\circ} C[/tex]).

What linear speed must an earth satellite have to be in a circular orbit at an altitude of 159 km?

Answers

Gravitational acceleration, g = GM/r^2. Additionally, for a satellite in a circular orbit, g = v^2/r

Where, G = Gravitational constant, M = Mass of earth, r = distance from the center of the earth to the satellite, v = linear speed of the satellite.

Equating the two expressions;
v^2/r = GM/r^2
v = Sqrt (GM/r);
But GM = Constant = 398600.5 km^3/sec^2
r = Altitude+Radius of the earth = 159+6371 = 6530 km

Substituting;
v = Sqrt (398600.5/6530) = 7.81 km/sec = 781 m/s

Explain why cooler stars are red and hotter stars are blue

Answers

More cool stars produce much of their light in the red part of the spectrum, so you see them, and bam, the color red. More hot stars, however, produce much more of their light in the green and or yellow spectrums, with much more tinier amounts of red / blue. This balance of the colors, your eye, sees simply as white. The more hot something is, the greater frequency of radiation it produces! Blue light has a higher frequency than red light, so the stars that glow red are cooler, than the stars that glow blue. :)

Hope this helped!

Which of the following helps explain why the planets remain in motion around the sun?

A. density
B. gravity
C. inertia
D. both gravity and inertia

Answers

Um I think it is D both gravity and inertia. Hope this helped
D is the answer hope helps

A voltage source in a circuit provides electrical _________.

Answers

A voltage source in a circuit provides electrical ENERGY.

In fact, a voltage source is a device (like a battery) that creates a potential difference between two points of the circuit. This potential difference allows charge carriers to move from one side of the device to the other side, flowing through the circuit, producing a current, and current is a form of electrical energy.

8. A thin slice of silicon that contains many solid-state components is a(n)
A) Transistor
B) Intergratef circuit
C) Diode
D) Cathode-ray tube

9. A current of 6.0 amps passed through a motor that has a resistance of 5.0 ohms. Clacukate the power
A) 30 watts
B) 150 watts
C) 180 watts
D) 900 watts

If you have the answers to the Electricity and Magnetism Unit Test I'd really appreciate all of them, I have less than an hour to finish this, yikes.

Answers

Final answer:

Answer to Question 8 is B) Integrated circuit. Answer to Question 9 is C) 180 watts, calculated using the power formula P = IV where I is current and V is voltage determined by Ohm's law.

Explanation:

Solution for Question 8:

A thin slice of silicon that contains many solid-state components and is referred to in the question is known as a(n) Integrated Circuit (IC). This is because an integrated circuit consists of numerous semiconductor devices like transistors, diodes, and resistors that are fabricated onto a single piece of semiconductor material, typically silicon. Therefore, the correct answer is B) Integrated circuit.

Solution for Question 9:

To calculate the power consumed by a motor when a current of 6.0 amps passes through it and it has a resistance of 5.0 ohms, we use the formula for electrical power, P = IV (Power = Current × Voltage). Since we know the current (I) and the resistance (R), we first need to find the voltage (V) using Ohm's law, V = IR (Voltage = Current × Resistance). Plugging in the values, we get V = 6.0 A × 5.0 Ω = 30.0 V. Now we can calculate the power, P = 6.0 A × 30.0 V = 180 watts. Thus, the correct answer is C) 180 watts.

A current of 1.8 A delivers 2.5 C of charge. How much time was required?
A.0.70 S
B.0.72 S
C.1.4 S
D..5 S

Answers

The current is defined as the amount of charge that flows through a given point in a certain time interval:
[tex]I= \frac{Q}{\Delta t} [/tex]
where Q is the charge and [tex]\Delta t[/tex] the time interval.

In our problem, I=1.8 A and Q=2.5 C, therefore we can find the time interval by re-arranging the previous formula and plugging these numbers into it:
[tex]\Delta t= \frac{Q}{I}= \frac{2.5 C}{1.8 A}=1.4 s [/tex]

Therefore, C) is the correct answer.

Answer: C

Explanation:

A particle moving with initial velocity of 5m/s is subjected to a uniform acceleration of -2.5 m/s2.find the displacement for next 4 second

Answers

1/2vt^2-1/2at^2
1/2*5*16-1/2*2,5*16=20

Which one of the following equations encompasses Boyle's Law, Charles's Law, and the relationship between pressure and temperature when the volume is constant?

A. P = F/A
B. P1V1 = P2V2
C. V1/T1 = V2/T2
D. PV = nRT

Answers

PV =nRT for ideal gases
Answer is D. PV=nRT
Hope this helped

The answer and how to do it

Answers

The answer is A. The resistance will be half(1/2R)
V=IR
R=V/I
If I is increased, R would decrease as R is inversely proportional to I.
Similarly, I is doubled by a factor of 2, R will decrease by a factor of 2.

Hope it helped!

A toy helicopter begins flying across a field with a speed of 3 m/s and an acceleration of 0.8 m/s2. How long does it take the helicopter to reach a speed of 7 m/s?

Answers

From equations of  motion;
v = u + at, where v = final velocity, u = initial velocity, a = acceleration, t = time taken to reach the final velocity. 
Using the values given,

7 = 3 + 0.8*t=> 7-3 = 0.8t

4 = 0.8t
t = 4/0.8 = 5 seconds

Can anyone please help me with answering this question? : An accelerating (speeding up) body has a Net Force acting in the direction of motion. True or False? Why? ​

Answers

That's true.

Netwon's second law states that the resultant of the forces F acting on a body is equal to the product between its mass m and its acceleration a:
[tex]\sum F = ma[/tex]
This means that if the net force acting on an object is different from zero (term on the left), than the acceleration of the object (term on the right) must be different from zero as well, and therefore the body is accelerating.

In particular, both F and a in the equation are vectors: this means that if the acceleration is positive, F and a have the same direction. In this problem, the acceleration is positive (because the object is speeding up), therefore the force and the acceleration have same direction.

Train car A is at rest when it is hit by train car B. The two cars, which have the same mass, are stuck together and move off after the collision. How does the final velocity of train cars A and B after the collision compare to the initial velocity of train car B before the collision? The final velocity is double train car B’s initial velocity. The final velocity is the same as train car B’s initial velocity. The final velocity is half of train car B’s initial velocity. The final velocity is zero since train car B will stop.

Answers

Answer:

C) The final velocity is half of train B's initial velocity.

Explanation:

The law of conservation of momentum states that in an isolated system, the total momentum of the system will remain constant. In this case, the two train cars will be treated as an isolated system.

Momentum is calculated by multiplying mass and velocity. Because the initial and final momentum are equal, we know that

[tex]m_Av_A+m_Bv_B=m_fm_f[/tex]

Since train A and train B have the same mass, mF = 2mB. Also, train A's initial momentum was 0 because it was at rest. So, we have

[tex]m_Bv_B=2m_Bv_f\\v_B=2v_f[/tex]

So, we find that the final velocity is half of train B's initial velocity.

How much heat is required to warm 1.40 l of water from 20.0 ∘c to 100.0 ∘c? (assume a density of 1.0g/ml for the water.)?

Answers

The water density is 
[tex]d=1.0 g/mL = 1000 g/L[/tex]
And the mass of 1.40 L of water is
[tex]m=dV=(1000 g/L)(1.40 L)=1400 g[/tex]

The amount of heat needed to increase the temperature of the water by [tex]\Delta T[/tex] is given by
[tex]Q=m C_s \Delta T[/tex]
where m is the water mass, [tex]C_s = 4.18 J/g ^{\circ}C[/tex] is the water specific heat capacity and 
[tex]\Delta T=100.0 ^{\circ}C-20.0 ^{\circ}C = 80.0^{\circ}C[/tex] 
is the increase in temperature. If we substitute these numbers into the equation, we find
[tex]Q=(1400 g)(4.18 J/g^{\circ}C)(80.0^{\circ}C)=4.68 \cdot 10^5 J[/tex]
Final answer:

The amount of heat required to warm the water can be calculated using the formula Q = mcΔT, where Q is the heat energy, m is the mass of water, c is the specific heat capacity of water, and ΔT is the change in temperature. Therefore, the amount of heat required to warm 1.40 L of water from 20.0 °C to 100.0 °C is 468,352 J.

Explanation:

The amount of heat required to warm the water can be calculated using the formula:

Q = mcΔT

Where Q is the heat energy, m is the mass of water, c is the specific heat capacity of water, and ΔT is the change in temperature.

Given that the density of water is 1.0 g/mL and the volume of water is 1.40 L, the mass of water can be calculated as:

m = density × volume = 1.0 g/mL × 1.40 L × 1000 mL/L = 1400 g

The change in temperature is 100.0 °C - 20.0 °C = 80.0 °C.

Substituting the values into the formula:

Q = (1400 g)(4.184 J/g °C)(80.0 °C) = 468,352 J.

Therefore, the amount of heat required to warm 1.40 L of water from 20.0 °C to 100.0 °C is 468,352 J.

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Michael is playing with two horseshoe magnets. He is trying to get them to touch, but they will not regardless of how hard he tries. Why will the magnets not come in contact?

Answers

since like poles repel, the two horseshoe magnets have like poles facing each other, hence they repel each other and therefore they will not come in contact
The reason the two horseshoe magnets wouldn't touch is because they are the same sides/ force. The saying of opposite attract becomes the opposite meaning, similar object repel. 

When applying a horizontal force of 30N, an object of mass 6 kg accelerates at 4m/s2. The force of friction on the surface must be ___ N

Answers

Using Newton's Second Law, F = ma, where F is the net force

So the net force is:

F = (6kg)(4m/s^2) = 24N

Since you are applying a horizontal force of 30N, we can find the force of friction by the difference of the net force and the applied force.

30N-24N = 6N

[tex]F_{f} = 6N[/tex]
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