Answers
Answer:
13.7%
Explanation:
Given that,
Heat absorbed by the engine = 97.2 kJ
Heat exhausted by the engine in each cycle = 83.8 kJ
We need to find the efficiency of the engine. It is calculated by the formula.
\(\eta=1-\dfrac{Q_e}{Q_a}\\\\=1-\dfrac{83.8}{97.2}\\\\=0.137\\\\=13.7\%\)
so, the efficiency of heat engine is 13.7%.
Related Questions
Please Help:)
How to draw two vectors being added:
Answers
Explanation:
you add the from head to tail. Head is the triangle and tail is the final point of the vector
The speed of light is 3×10^8 meters per second, which means that light can travel 300 million meters in just one second. How far can light travel in one minute?
Answers
Answer:
(1.8 × 10^9) meters in one minute
Explanation:
To determine how far light can travel in one minute, we need to multiply its speed by the number of seconds in a minute.
The speed of light is 3 × 10^8 meters per second.
There are 60 seconds in a minute.
Therefore, the distance light can travel in one minute is:
Distance = Speed × Time
Distance = (3 × 10^8 meters per second) × (60 seconds)
Calculating this, we get:
Distance = 3 × 10^8 meters/second × 60 seconds
Distance = 18 × 10^8 meters
Distance = 1.8 × 10^9 meters
So, light can travel approximately 1.8 billion (1.8 × 10^9) meters in one minute.
Some dragonflies splash down onto the surface of a lake to clean themselves. After this dunking, the dragonflies gain altitude, and then spin rapidly at about 1100 rpm to spray the water off their bodies. When the dragonflies do this "spin-dry," they tuck themselves into a "ball" with a moment of inertia of 2.0×10−7kg⋅m2 . How much energy must the dragonfly generate to spin itself at this rate?
Answers
The dragonfly must generate approximately 4.8 × 10^-4 Joules of energy to spin itself at a rate of 1100 rpm.
Start by converting the rotational speed from rpm (revolutions per minute) to rad/s (radians per second). Since 1 revolution is equal to 2π radians, we can use the conversion factor:
Angular speed (ω) = (1100 rpm) × (2π rad/1 min) × (1 min/60 s)
ω ≈ 115.28 rad/s
The moment of inertia (I) is given as 2.0 × 10^-7 kg⋅m².
Use the formula for rotational kinetic energy:
Rotational Kinetic Energy (KE_rot) = (1/2) I ω²
Substituting the given values:
KE_rot = (1/2) × (2.0 × 10^-7 kg⋅m²) × (115.28 rad/s)²
Calculate the value inside the parentheses:
KE_rot ≈ (1/2) × (2.0 × 10^-7 kg⋅m²) × (13274.28 rad²/s²)
KE_rot ≈ 1.331 × 10^-3 J
Round the result to the proper number of significant figures, which in this case is three, as indicated by the given moment of inertia.
KE_rot ≈ 4.8 × 10^-4 J
Therefore, the dragonfly must generate approximately 4.8 × 10^-4 Joules of energy to spin itself at a rate of 1100 rpm.
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Using the periodic table, determine which of the following atoms is most likely to form a positive ion?
Answers
Using the periodic table Calcium (Ca) is most likely to form a positive ion.
What is ion?Ion is a type of particle that has an electric charge. It can be positively or negatively charged, depending on its atomic structure and the number of protons and electrons it contains. Positively charged ions are called cations and negatively charged ions are called anions. Ions play an important role in a variety of physical and chemical processes, such as forming ionic bonds, allowing substances to dissolve in water, and carrying electrical current in solutions. They are also important in the formation and stability of molecules, as well as in the formation of compounds and minerals.
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Select the correct answer. In a given chemical reaction, the energy of the products is greater than the energy of the reactants. Which statement is true for this reaction? A. Energy is absorbed in the reaction. B. Energy is released in the reaction. C. No energy is transferred in the reaction. D. Energy is created in the reaction. E. Energy is lost in the reaction.
Answers
c = speed of light = 3.00 × 108 m/s
A gamma ray has a very high frequency of about 1019 s−1. What is the wavelength of the gamma ray?
A.
3.00 × 10−11 m
B.
3.00 × 1027 m
C.
3.33 × 1010 m
D.
3.33 × 10−12 m
URGENT!!!!!!!!!!
Answers
Answer:
The correct answer is option A: 3.00 × 10^(-11) m.
Explanation:
To find the wavelength of a gamma ray with a frequency of about 10^19 s^(-1), we can use the equation:
wavelength = speed of light / frequency
Given:
Speed of light (c) = 3.00 × 10^8 m/s
Frequency (f) = 10^19 s^(-1)
Substituting the values into the equation:
wavelength = (3.00 × 10^8 m/s) / (10^19 s^(-1))
To simplify the expression, we can rewrite the denominator as (1 / 10^(-19)) s:
wavelength = (3.00 × 10^8 m/s) / (1 / 10^(-19)) s
To divide by a fraction, we multiply by its reciprocal:
wavelength = (3.00 × 10^8 m/s) × (10^(-19) s)
Applying the properties of exponents, we can add the exponents when multiplying with the same base:
wavelength = 3.00 × 10^(-11) m
Therefore, the wavelength of the gamma ray is approximately 3.00 × 10^(-11) m.
An ideal monatomic gas expands isothermally from 0.540 m3 to 1.25 m3 at a constant temperature of 720 K. If the initial pressure is 1.20e5 Pa.
a) Find the work done on the gas
b) Find the thermal energy transfer Q
c) Find the change in the internal energy
Answers
Answer:
a) The work done on the gas during an isothermal expansion is given by:
W = nRT ln(V2/V1)
where n is the number of moles of gas, R is the gas constant, T is the temperature, V1 is the initial volume, and V2 is the final volume.
Since the gas is monatomic, we can use the ideal gas law to find the number of moles:
PV = nRT
n = PV/RT
Substituting this expression for n into the equation for work, we get:
W = PV ln(V2/V1)
where we have cancelled out the R and T terms.
Substituting the given values, we get:
W = (1.20e5 Pa)(0.540 m^3) ln(1.25/0.540) = 1.38e4 J
b) The thermal energy transfer Q during an isothermal process is equal to the work done on the gas. Therefore, Q = 1.38e4 J.
c) The change in internal energy ΔU of a gas during an isothermal process is zero, since the temperature of the gas does not change. Therefore, ΔU = 0.
W = nRT ln(Vf/Vi)
where:
- n is the number of moles of gas
- R is the gas constant (8.31 J/mol*K)
- T is the temperature of the gas
- Vi and Vf are the initial and final volumes of the gas, respectively
Since the gas is monatomic, its molar specific heat at constant volume is Cv = (3/2)R, and its molar specific heat at constant pressure is Cp = (5/2)R. Since the process is isothermal, the temperature of the gas remains constant, so T = 720 K for both Vi and Vf. Therefore, we can simplify the equation for work to:
W = nRT ln(Vf/Vi) = nRT ln(1.25/0.540)
We can calculate the number of moles of gas using the ideal gas law:
PV = nRT
n = PV/RT
Substituting the given values, we get:
n = (1.20 x 10^5 Pa)(0.540 m^3)/(8.31 J/mol*K)(720 K) ≈ 9.86 mol
Therefore, the work done on the gas is:
W = nRT ln(1.25/0.540) ≈ 9.92 x 10^3 J
b) The thermal energy transfer Q during an isothermal process is equal to the work done on the gas:
Q = W ≈ 9.92 x 10^3 J
c) The change in internal energy ΔU of an ideal gas during an isothermal process is zero, since the temperature of the gas remains constant and internal energy is a function of temperature only. Therefore, ΔU = 0.
A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?
Answers
Answer:
(a) q = 2.357 x 10⁻⁵ C
(b) Φ = 2.66 x 10⁶ N.m²/C
Explanation:
Given;
diameter of the sphere, d = 1.1 m
radius of the sphere, r = 1.1 / 2 = 0.55 m
surface charge density, σ = 6.2 µC/m²
(a) Net charge on the sphere
q = 4πr²σ
where;
4πr² is surface area of the sphere
q is the net charge on the sphere
σ is the surface charge density
q = 4π(0.55)²(6.2 x 10⁻⁶)
q = 2.357 x 10⁻⁵ C
(b) the total electric flux leaving the surface of the sphere
Φ = q / ε
where;
Φ is the total electric flux leaving the surface of the sphere
ε is the permittivity of free space
Φ = (2.357 x 10⁻⁵) / (8.85 x 10⁻¹²)
Φ = 2.66 x 10⁶ N.m²/C
explain why the ray does not bend when it enters the semi circular glass block
Answers
The ray does not bend when it enters the semi circular glass block - Light ray incident on semicircular block at 90 degrees, therefore there is no change in the direction of ray at P.
Electromagnetic radiation that falls within the region of the electromagnetic spectrum that the human eye can see is known as light or visible light.
Light is electromagnetic radiation that the human eye can perceive. From radio waves with wavelengths measured in meters to gamma rays with wavelengths shorter than around 1 1011 meters, electromagnetic radiation occurs throughout an incredibly broad range of wavelengths.
Light governs our sleep-wake cycle and is crucial to our health and wellbeing. In actuality, "light" that is visible is a type of radiation, which is just energy that moves in the form of electromagnetic waves. It can alternatively be explained as a flow of "wave-packets," or particles, known as photons.
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When heal flows between systems Entropy
Answers
Answer: increases
Explanation:
You have deposited the other $400 in a savings account, which pays three percent interest compounded quarterly. Find the amount in the account for 0, 5, 10, 15, and 20 years, using the compound interest formula.
Answers
The compound interest formula is given by:
\(I=P(1+\frac{r}{n})^{tn}\)where,
P: principal investment = $400
r: interest rate = 3% = 0.03
n: times at year = 4 quarterly
t: years = 0, 5 , 10, 15, 20
Replace the previous values of the parameters into the formula for I and simplify for each value of t:
\(\begin{gathered} I_0=400(1+\frac{0.03}{4})^{0\cdot4}=400(1+0.0075)^0=400(1.0075)^0=400 \\ I_5=400(1.0075)^{5\cdot4}\approx464.5 \\ I_{10}=400(1.0075)^{10\cdot4}\approx539.3 \\ I_{15}=400(1.0075)^{15\cdot4}\approx626.3 \\ I_{20}=400(1.0075)^{20\cdot4}\approx727.2 \end{gathered}\)Hence, the amounts for t=0, 5, 10, 15 and 20 years are, respectivelly:
$400
$464.5
$539.3
$626.3
$727.2
1 point
Jessica walks to a market 2.42 miles from her house. It takes her 1.1 hours
to get there. What is Jessica's average speed during her trip to the market?
2.2 mi/hr
0.44 mi/hr
2.66 m/s
0.45 m/s
Answers
A 10 KVA, 380 V, 50 Hz, 3-phas, star-connected salient pole alternator has direct axis and quadrature axis reactances of 12 ohms and 8 ohms respectively. The armature has resistance of 1 ohin per phase, The generator delivers rated load at 0.8 p,f lagging with the terminal voltage being maintained at rated value. If the load angle is 16.15, determine (i) the direct axis and quadrature axis components of armature current, (b) excitation voltage of the generator.
Answers
Direct axis and quadrature axis components of armature current are 30.28 A and 46.92 A respectively, and the excitation voltage of the generator is 765.36 V.
Given:
Apparent power (S) = 10 KVA = 10,000 VA
Line voltage (V) = 380 V
Frequency (f) = 50 Hz
Xd = 12 ohms
Xq = 8 ohms
Ra = 1 ohm
Power factor (pf) = 0.8 lagging
Load angle (δ) = 16.15 degrees
(i) Armature current's direct axis and quadrature axis components
We know that the apparent power is given by S = 3VLILcos(φ), where VL is the line voltage, IL is the line current, and φ is the angle between them. For a star-connected alternator, line voltage is equal to phase voltage, so we can write:
S = 3Vphase Iphase cos(φ)
Iphase = S / (3Vphase cos(φ))
For a lagging power factor, cos(φ) = 0.8, so
Iphase = 10,000 / (3 x 380 x 0.8) = 10.46 A
The direct axis component (Id) and the quadrature axis component (Iq) make up the armature current. Using the given values of Xd, Xq, and Ra, we can calculate these components as follows:
Id = (VL - IaRa) / Xd
Iq = (VL - IaRa) / Xq
where Ia is the magnitude of the armature current, which is equal to the magnitude of the line current divided by √3. Thus,
Ia = Iphase / √3 = 10.46 / √3 = 6.03 A
Substituting the given values:
Id = (380 - 6.03 x 1) / 12 = 30.28 A
Iq = (380 - 6.03 x 1) / 8 = 46.92 A
(ii) Excitation voltage of the generator:
The excitation voltage (E) of the generator is given by:
E = Vphase + IqXq
Substituting the given values:
E = 380 + 46.92 x 8 = 765.36 V
Therefore, the direct axis and quadrature axis components of armature current are 30.28 A and 46.92 A respectively, and the excitation voltage of the generator is 765.36 V.
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Help please
Stress is a ______________ that's created when we react to particular events.
Flag this Question
Question 2 5 pts
What signals the adrenal glands to produce more of the hormones adrenaline and cortisol and release them into the bloodstream?
Group of answer choices
hyperextension
hypothalamus
hypodermis
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Question 3 5 pts
When the adrenal glands produce more of the hormones adrenaline what are two of the body’s reaction to these additional hormones:
Group of answer choices
heart rate slows down and pupils constrict
blood pressure and metabolism decrease
heart rate speeds up and sweat is produced
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Question 4 5 pts
Match the following terms with their appropriate definitions.
Group of answer choices
the stress response
the events that provoke stress
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Question 5 5 pts
The article talks about building up your resilience to cope with stress. What does resilience mean?
Group of answer choices
the capacity to recover quickly from difficulties
incapable of change
not good in stressful situations
Flag this Question
Question 6 5 pts
What are two ways that you can control stress?
Group of answer choices
compulsiveness and pesim
Answers
Answer:
This doesn't seem to really be a physics problem:
In physics stress is usually defined as Young's Modulus or Bulk Modulus
In the case of Young's Modulus Y would be defined as
Y = Stress / Strain or Force / Area
So the stress would be the force acting on some particular area: in the case of a wire the area is merely the area of the wire where the force is applied.
So maybe, they mean that stress would be an increase in blood pressure or some other physiological reaction due to an externally applied force.
During which type of change should you expect to see different chemical
symbols before and after the change?
A. Chemical
B. Phase
C. Nuclear
D. Physical
Answers
During the nuclear change we can expect to see different chemical symbols before and after the change
Chemical and nuclear reactions are quite different from one another. Atoms can share electrons with other atoms or participate in an electron transfer to increase their stability in chemical reactions. In nuclear reactions, the atom's nucleus stabilizes itself by going through some sort of alteration. Compared to the energies involved in chemical reactions, the energies produced in nuclear reactions are many orders of magnitude higher. Environmental factors like temperature or pressure do not significantly affect nuclear reactions like they do with chemical ones.
Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei
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A certain radio wave has a frequency of 2.0 x 10
6
106 Hz. What is its wavelength?
Answers
Radio waves are a type of electromagnetic radiation that propagate through space at the speed of light.
The speed of light in vacuum is approximately 3.0 x 10^8 m/s. The relationship between the frequency and wavelength of a wave is given by the formula:
c = λf
where c is the speed of light, λ is the wavelength, and f is the frequency. Rearranging this equation, we get:
λ = c / f
Substituting the values given in the problem, we get:
λ = 3.0 x 10^8 m/s / 2.0 x 10^6 Hz
Simplifying, we get:
λ = 150 m
Therefore, the wavelength of the radio wave is 150 meters.
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What is your hypothesis regarding difference in urine specific gravity between subjects who drank water and subjects who a drank sports drink
Answers
Answer:
Sports drink will show increase in specific gravity
While
Water will decrease in SG
Explanation:
This is because the relative density of urine will increase because of presence of ions in the sport drink unlike in water that has very little ions
3. How do electric and magnetic forces act on different object?
OA. They only pull objects.
OB. They only push objects.
OC. They either push or pull objects.
OD. They only push or pull objects when they touch each other.
Answers
Select the correct answer. When a substance changes from one phase to another, which of the following events occurs? A. The substance loses or gains heat. B. The average kinetic energy of the substance changes. C. The temperature of the substance changes. D. The molecular motion of the substance changes.
Answers
When a substance changes from one phase to another, which of the following events occurs (A) The substances loses or gains heat.
A Phase change is reversible physical change that happens when a substance changes from one state of matter to the another state of matter. when substances changes from solid , liquid or gas state to different state called as phase change. Temperature can change the substance from one phase to another. for example . we can freeze the water by putting it to freezer to change it into ice and when we put it on heat it changes to liquid.
Thus, When a substance changes from one phase to another, which of the following events occurs (A) The substances loses or gains heat.
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Answer:
The substance loses or gains heat.
Explanation:
Substances can be made to change phases by fluctuating the temperature, the pressure, or both
When ocean temperature rises,
a. excess gas is released into the atmosphere.
b. the ocean absorbs and holds carbon dioxide.
c. carbon dioxide is equalized between the ocean and atmosphere. d. no change takes place.
Answers
Answer:
see below
Explanation:
Kind of like when yo open a warm soda .....excess gas is released
Are worm holes a real phenomenon?
Answers
So to cut the story short, it is not a proven phenomenon only theoretical.
A granite block is at rest on a horizontal surface in a vacuum chamber. The granite block is 3 cm tall, and the length and width are both 20 cm. The density of granite is 2.75 g/cm^3. What pressure does the block exert on the surface?
Answers
Answer:
M = V ρ = .03 * .2*2 cm^3 * 2.75 g / cm^3 = .0033 kg weight
W = m g = .0033 kg * 9.80 m / s^2 = .032 N
P = F / A = W / A = .032 N / .2^2 m^2 = .80 N/m^2 = .80 Pascal
Aaron ran 500 meter in 100 Seconds. Find the speed in km per hour.
Answers
Answer:
50km
cuz he ran so fast in 100 seconds
Explain the process of refraction of light
Answers
The process of refraction of light occurs when light rays bends when travelling between media of different densities.
What is refraction of light?
Refraction of light is the bending of light rays or the change in the direction of light rays as it travels between media of different densities.
Light waves travel faster in media of less density than media of more density.
The change in density of the media makes light waves to be bend towards or away from the normal.
For example, when light travels from less dense air to more dense water, the light rays are bent towards the normal. However, when light rays travel from water to air, the light rays are refracted away from the normal.
In conclusion, refraction of light waves occur when light crosses the boundary of media of different densities.
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force and ___ work together cause objects to move or to stay in place
Answers
Answer:
frictional force
2. The muscles on the right side of your body are controlled by what part of your brain? the right cortex the right hemisphere the left cortex the left hemisphere
Answers
Answer:
Motor cortex
Both hemispheres have a motor cortex, with each side controlling muscles on the opposite side of the body (i.e, the left hemisphere controls muscles on the right side of the body).
Explanation:
A 120-V rms voltage at 60.0 Hz is applied across an inductor, a capacitor, and a resistor in series. If the peak current in this circuit is 0.8484 A, what is the impedance of this circuit?
A) 200 Ω
B) 141 Ω
C) 20.4 Ω
D) 120 Ω
E) 100 Ω
Answers
Answer:A 200
Explanation:
Vp=1.41*Vrms
Vp=169.7 v
Z=Vp/Ip
Z=169.7/.8484
Z=200.03 ohm
ASAP HELPPPPPP POP PLEASE
Answers
Answer:
The answer is in the attachment
Explanation:
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If a biker rides west for 50 miles from his starting position, then turns and bikes back east for 80 miles. What is his displacement?
Answers
Answer:
Displacement = 30 miles due east.
Explanation:
Let the distance due west be A
Let the distance due east be B
Given the following data;
A = 50 miles
B = 80 miles
To find the displacement;
Displacement can be defined as the change in the position of a body or an object. It is a vector quantity because it has both magnitude and direction.
Thus, the displacement would be calculated by subtracting distance A from distance B because the rider rode in opposite directions.
Displacement = B - A
Displacement = 80 - 50
Displacement = 30 miles due east.
Consider a system of two charges of magnitude 2 × 10-7 C and 4.5 × 10-7 C which is acted upon by a force of 0.1 N. What is the distance between the two charges?
Answers
To find the distance between two charges, we can use Coulomb's law, which states that the force between two charges is proportional to the product of their magnitudes and inversely proportional to the square of the distance between them.
The formula for Coulomb's law is:
F = (k * |q1| * |q2|) / r^2
where:
F is the force between the charges,
k is the electrostatic constant (k = 8.99 × 10^9 N m^2/C^2),
|q1| and |q2| are the magnitudes of the charges, and
r is the distance between the charges.
Given:
|q1| = 2 × 10^-7 C
|q2| = 4.5 × 10^-7 C
F = 0.1 N
k = 8.99 × 10^9 N m^2/C^2
We can rearrange the equation to solve for r:
r^2 = (k * |q1| * |q2|) / F
Plugging in the values:
r^2 = (8.99 × 10^9 N m^2/C^2 * 2 × 10^-7 C * 4.5 × 10^-7 C) / 0.1 N
r^2 = (8.99 × 2 × 4.5) * (10^9 * 10^-7 * 10^-7) / 0.1
r^2 = 80.91 * (10^9 * 10^-7 * 10^-7) / 0.1
r^2 = 80.91 * 10^(-7 + 9 - 1)
r^2 = 80.91 * 10^1
r^2 = 809.1
Taking the square root of both sides:
r = √809.1
r ≈ 28.46
Therefore, the distance between the two charges is approximately 28.46 units.