The hot summer cottage she left in September will still be hot when she returns in June as long as no one enters it (Isolated).
What is second law of thermodynamics?The second law of thermodynamics states that, hot things always cool unless you do something to stop them. Or the total entropy of an isolated system can never decrease.
In other words, not all heat energy can be converted into work in a cyclic process.
Therefore, we can conclude that when the woman returns, the hot summer cottage she left in September will still be hot when she returns in June as long as no one enters it (Isolated).
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What must be known to determine the direction of the magnetic force on a charge? check all that apply.
please check attachment hope it helps you।।
आपका दिन शुभ रहे।।
If the gravitational force on an object is directly proportional to its mass, why don’t objects with large masses fall with greater acceleration than small ones?.
I need the answer of question (6) with explanation.
why didn't the geologists include dates in the notes for the sedimentary rock layers?
Answer:
To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
How long would it take a machine to do 5000 joules of work if the power rating of the machine is 100 watts?
A. 0.2 s
B. 10 s
C. 50 s
D. 5 000 s
Answer:
hope this he;ps
Explanation:
power = work ÷ time
time = work ÷ power
time = 5,000 J ÷ 100 W
time = 50 s
How much work do you do on a 25- kg backpack when you walk a horizontal distance of 100m ?
Answer:
2,500
Explanation:
what does the expression of the power consumed by an electric appliances by a DC current? What is this unit of this power in SI?
Explanation:
dc stands for direct current it won't hurt u if u get in contact with dc but ac will be threatening to life
si unit is same as in ac (alternate current) and it is ampere or amp
what unit of the energy does a power company charge a consumer for
I. Briefly answer the following questions.
1. Do renewable energy sources have little or no impact compared to
non- renewable resources? Why?
2. Discuss two human activities that endanger renewable resources.
Question 4
20 pts
A student connects a length of unknown
material in series with a battery and an
ammeter (which measures current flow).
When the circuit is complete, the ammeter
reads that no current is flowing.
The unknown material is most likely –
Insulator
Semiconductor
Superconductor
Conductor
If current did not flow in the circuit, it simply implies that the material is an insulator.
What is an insulator?An insulator is a material that does not conduct electricity. A circuit is a path that is provided for the flow of current.
If this material was connected into a complete circuit yet current did not flow in the circuit, it simply implies that the material is an insulator.
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A girl kicks a soccer ball into the air. Which of these best explains why the soccer ball falls back to Earth?
a.the motion of the ball is changed by extreme forces
b.the acceleration of the ball is unstable
c.the force exerted on the ball is greater than gravity
d.the pressure on the ball changes with altitude
Answer:
a
that extreme force is gravity changing the moshon
A gyroscope flywheel of radius 2.12 cm is accelerated from rest at 16.2 rad/s2 until its angular speed is 1820 rev/min. (a) what is the tangential acceleration of a point on the rim of the flywheel during this spin-up process
The tangental acceleration of the flywheel of radius 2.12 cm with a final angular velocity of 1820 rev/min and an angular acceleration of 16.2 rad/s is 0.34 m/s².
What is tangental acceleration?This is the rate of change of tangental velocity of an object in circular motion.
To calculate the tangental acceleration, we use the formula below.
Formula:
a = αr............. Equation 1Where:
a = Tangental accelerationr = radius of the flywheelα = Angular acceleration of the flywheel.From the question,
Given:
r = 2.12 cm = 0.0212 mα = 16.2 rad/s²Subsitute these values into equation 1
a = (0.0212×16.2)a = 0.34 m/s²Hence, The tangental acceleration of the flywheel of radius 2.12 cm with a final angular velocity of 1820 rev/min and an angular acceleration of 16.2 rad/s is 0.34 m/s².
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To clean the floor, David exerts a 40 N force on a broom handle to push it 2 m, what is the work done by David on the broom?
Answer:
80Nm
Explanation:
work done = force x distance
force= 40N, distance = 2m
work done= 40 x 2 = 80Nm
The region around a magnet in which magnetic forces can act is called the
magnetic field.
domain.
pole.
solenoid.
Answer:
magnetic fieldExplanation:
The region around a magnet in which magnetic forces can act is called a magnetic field.
Domain is not related to this topic ⇒ MathematicsPole ⇒ Magnets possess both North and South polesSolenoid ⇒ A iron core around which a wire is usually coiledCan you jump and fall at the same time?
i hate you right now..... im gonna be thinking about this all day now....... ohhhhhhh no i need my 5 monsters now cause i aint sleepin now......
What would likely happen if the fed changed reserve requirements?
Answer:
When the Fed adjusts the reserve requirement, it allows banks to charge lower interest rates.
Explanation:
Hope this helps.
A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is 50%. 90%. 10%. 110%. none of the above
Answer:
Explanation: 10%
What is the overall energy transformation in a coal-fired power plant?.
Answer: thermal energy, mechanical energy and, finally, electrical energy.
Explanation:
As a type of thermal power station, a coal-fired power station converts chemical energy stored in coal successively into thermal energy, mechanical energy and, finally, electrical energy. The coal is usually pulverized and then burned in a pulverized coal-fired boiler.
What is the SI (metric) unit of FORCE?
A. meter
B. newton
What is the SI (metric) unit of FORCE?
B. newtonwith symbol ( N )
All the best !
Answer:
B, Newton,
Explanation:
B. Newton defined as the Force which when applied to 1 Kg mass produces an acceleration of 1 m/s/s.
F = m * a.
explain the concept of force by practical examples of daily life
Answer:
a bicycle moving
Explanation:
due to the force that is applied towards the wheels of a bicycle and also gravitation the wheels. of a bicycle are therefore able to move
Determino la masa en gramos y kilogramos de 1500 cm3 de alcohol etílico, cuya densidad es aproximadamente 790.0 Kg/m3. Tomar en cuenta que: Densidad (ρ) = masa (m)/volumen(v).
Para calcular el contenido en gramos de una bebida alcohólica basta con multiplicar los grados de la misma por la densidad del alcohol (0,8). El contenido de alcohol de una bebida depende de la concentración de alcohol y del volumen contenido.
The mass in grams and in kilograms of ethyl alcohol respectively is: a) 1185.0 g and b) 1185 kg
What is density?Density is an intensive property of matter. It represents the relationship between the mass and the volume of a body or substance. Its units are in the International System kg/m3, kg/L, g/ml, g/cm3, among others.
The density formula is:Density = m/V
The mass is obtained by clearing this equation
m=Density *Volume
datam= ?
V= 1500 cm3 * 1 * 10⁻⁶ m³ / 1 cm³ = 0.0015 m³ = 1.5 * 10⁻³ m₃
Density= 790.0 kg/m3
m = 790.0 kg/m³ * 1.5 * 10⁻³m³ = 1.185 Kgm = 1.185 kg * 1000 g/ 1 kg = 1185,0 gm= 1185,0 gSee more about this at:https://brainly.com/question/23704878When working with a conservative force, it is generally easier to work with a potential energy function, which is a scalar, than to compute the work along some path from the forces and displacements, which are vectors. the change in the potential energy of an object depends only upon its initial and final position, but it is independent of the path undertaken to move between those positions. some effort is initially required to obtain the potential energy function. consider a block of mass m attached to the end of a horizontal hooke's law spring with spring constant k. the block is free to move along a frictionless horizontal surface, and displacements are measured from the equilibrium position of the spring, taken here as the origin of the coordinate system.
a = fs = - k x iì‚
b = ds = dx iì‚
c = dw = - k x dx
d = dus = k x dx
required:
a. a finite change in the potential energy may be obtained by integrating infinitesimal changes. what integral expressions is correct for this hooke's law spring?
b. perform the integrations, and input an expression for the change in the potential energy of the spring, also known as the elastic potential energy.
a. The integral expression for the change in potential energy of the spring is ΔU = ∫kxdx
b. The change in potential energy of the spring is ΔU = k(x₂² - x₁²)/2
Since we are given the differential elastic potential energy, du, to find the integral expression, we integrate du.
a. The integral expression for the change in potential energy of the springThe integral expression for the change in potential energy of the spring is ΔU = ∫kxdx
Since the infinitesimal elastic potential energy of the spring du = kxdx, integrating both sides of the expression, we have
ΔU = ∫du
ΔU = ∫kxdx
So, the integral expression for the change in potential energy of the spring is ΔU = ∫kxdx
b. The elastic potential energy of the springThe change in potential energy of the spring is ΔU = k(x₂² - x₁²)/2
Performing the integration for the change in potential energy of the spring
ΔU, we have that integrating for change in length from x₁ to x₂
ΔU = ∫kxdx
ΔU = k[x²/2]₁²
ΔU = kx₂²/2 - kx₁²/2
ΔU = k(x₂² - x₁²)/2
So, the change in potential energy of the spring is ΔU = k(x₂² - x₁²)/2
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Help, Please...Please Please, please please please, please, please please please please, please
Answer: i thinks Its C
Explanation:
] After treatment, hospital equipment may become contaminated.
Describe the level of the hazard associated with contamination with technetium-99.
You should include in your answer a description of how the level of hazard changes
over time.
Answer:
below
Explanation:
The primary hazard when working with technetium is inhalation of dust; such radioactive contamination in the lungs can pose a significant cancer risk. All technetium compounds should be regarded as highly toxic, largely because of its radiological toxicity. Once in the human body, Tc-99 concentrates in the thyroid gland and the gastrointestinal tract. The body, however, constantly excretes Tc-99 once it is ingested.
This group of elements is in group 2?
Answer:
If you meant the Periodic Table it's the alkaline-earth metal
beryllium (Be)
magnesium (Mg)
calcium (Ca)
strontium (Sr)
barium (Ba)
radium (Ra)
Explanation:
Proper use of the friction zone makes it easier to:.
Friction is the opposition offered to the movement of a surface on another and depends on the nature of the surfaces in contact.
What is friction?The term friction refers to the opposition that is offered by surfaces in contact when they move over each other. The question is incomplete but I will try to help you the much I can.
Now recall that fricton only depends on the nature of the surfaces in contact. The friction is te reason when heat is provides in the moving parts of machines.
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Can you help me pls
What happens when a student replaces the switch in an electric circuit with an object. A light bulb in the circuit does not light up. What can the student conclude about the object
Answer:
The student can conclude that as the bulb is not lighting up so the object can be insulator
Explanation:
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE
What is simple harmonic oscillation? express your answer verbally, mathematically, and visually.
Simple harmonic motion is the motion in objects where the restoring for d is directly proportional to the body displacement.
What is simple harmonic motion?Simple harmonic motion a type of periodic motion where the force that restores moving object to it's right position is directly proportional to the magnitude of body's displacement and this normally acts towards the object's equilibrium position.
The formulate for simple harmonic motion are
,F = −kx, where F is the force, x is the displacement, and k is a constanst. An example of a simple harmonic oscillator is the vibration of a mass attached to a vertical spring.
Simple harmonic oscillator can be represented by the equation x ( t ) = A cos ( 2 π f t ) x(t) = A\cos(2\pi f t) x(t)=Acos(2πft)x,
where t is period.
x is displacement
A is amplitude.
Learn more about simple harmonic motion here.
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i would appreciate your help
Answer:
22. C. Pz > Py > Px
23. B. 5.0 × 10⁴Pa
24. B. Upward thrust exerted by the liquid
25. B. The volume of the object immersed in the liquid decreases
26. D. When a body is wholly or partially immersed it experiences upthrust equal to the weight of the fluid displaced
Explanation:
22. The more you go deeper into the sea, the more the pressure of the water increases pushing down on you.
The reason why salt water is very dense is that when the salt dissolves in the water, it adds to the mass of the water, which makes the water more denser.
Due to this, we can assume that the water pressure exerted on the fish will be greater beneath the sea than the lake at the same depth.
Answer: C. Pz > Py > Px
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23.
Given:
Density of water = 1000 kg m⁻³
Atmospheric pressure at sea level, Patm = 1.0 × 10⁵ Pa]
Depth of water in sea = 5m
To find the pressure exerted by the water on the fish, we use the formula: P = hpg
P = pressure
h = height or depth of water
p = density of water
g = gravitational field strength
We are given the depth and density, but not the gravitational field strength
Gravitational Field Strength: Measures how much gravity there is
And since we live on earth, the gravitational field strength is 10 N/kg
Depth, h = 5m
Density, ρ = 1000 kg/m³
Gravitational Field Strength, g = 10 N/kg
Now we substitute these into the formula:
P = hpg
P = (5)(1000)(10)
Multiply 5 and 1000 to get 5000
P = 5000 × 10
Multiply 5000 and 10 to get 50000
P = 50000Pa
↓
P = 5.0 × 10⁴Pa
Answer: B. 5.0 × 10⁴Pa
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24. When a body is fully or partly immersed in a liquid, it undergoes an apparent loss in its weight due to upward thrust exerted by the liquid.
The upward thrust is the same as the weight of the fluid being displaced by an object.
Answer: B. Upward thrust exerted by the liquid
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25.
When you add common salt to water it becomes denser, which can increase the mass and volume of the water. Due to water becoming denser, it can make an object thats less dense float. Also, density and volume are inversely proportional to each other, meaning that when density increases, volume decreases.
Answer: B. The volume of the object immersed in the liquid decreases.
----------------------------------------------------------------------------------------------------------
26.
Achimede's principle states that:
Answer: D. When a body is wholly or partially immersed it experiences upthrust equal to the weight of the fluid displaced.
a 20-kg object travelling at 20 m/s collides head on with an 18-kg object travelling at 17 m/s.If they were locked together after the collision, what is their velocity?.
Answer:
2.47 m/s
Explanation:
Momentum = Mass X Velocity
If they were locked together, it means its a perfectly inelastic collision. Therefore,
Total momentum before = Total momentum after
Total momentum before = (20 X 20) - (18 X 17)
= 94
Total momentum after = 94
Y = Object speed after collision
94 = (20+18)Y
Y = 2.47368421 m/s
What is the definition of a surface wave?
Answer:
A surface wave is a wave that travels on the crust of the earth after an earthquake; surface waves cause the destruction of an earthquake
Explanation:
A surface wave is a wave that travels on the crust of the earth after an earthquake; surface waves cause the destruction of an earthquake
