Answer:
T cell
Explanation:
a. If 0.45 kg of iron at 140°C is added to 1.5 kg of water at 22°C, what will be the final temperature of the system? (4 points)
Answer:
25.67 °C
Explanation:
From the question,
Heat lost by iron = heat gained by water
c'm'(t₁-t₃) = cm(t₃-t₂)................ Equation 1
Where c' = specific heat capacity of iron, m' = mass of iron, c = specific heat capacity of water, m = mass of water, t₁ = initial temperature of iron, t₂ = initial temperature of water, t₃ = temperature of the system.
make t₃ the subject of the equation
t₃ = (c'm't₁+cmt₂)/(c'm'+cm).............. Equation 2
Given: m' = 0.45 kg, t₁ = 140 °C, t₂ = 22 °C, m = 1.5 kg
Constant: c' = 450 J/kg.K, c = 4200 J/kg.K
Substitute these values into equation 2
t₃ = (0.45×450×140+1.5×4200×22)/(450×0.45+4200×1.5)
t₃ = (28350+138600)/((202.5+6300)
t₃ = 166950/6502.5
t₃ = 25.67 °C
Using the text and the lab results, can you identify the TRUE statements?
The instantaneous speed of the car at 40 cm was about 2cm/sec.
The speed of the car increased during the 100 cm trip.
The straight line in the graph indicates that the speed during the trip was constant.
Every two seconds the wind-up car moved about 20 cm.
The data tells us that it takes the wind-up car about 50 seconds to travel 100 cm.
Without the actual text and lab results, it's not possible to definitively confirm these statements. They involve concepts of physics including instantaneous speed, acceleration, constant speed, and average speed. Understanding these terms can aid in evaluating the claims.
Explanation:In the absence of the actual text and lab results, it's impossible to definitively evaluate the truth of these statements. However, here's a general understanding of what each would mean:
The instantaneous speed of the car at 40 cm was about 2 cm/sec. - This means at the very moment when the car had traveled 40 cm, it was moving at a rate of 2 cm every second.
The data tells us that it takes the wind-up car about 50 seconds to travel 100 cm. - This implies an average speed of 2 cm/sec.
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A car has a force of 2000N and a mass of
1000kg. What is the acceleration of the
car?
Answer:
2 m/s
Explanation:
The acceleration of the car is 2 m/s².
What is acceleration?
Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).
Given parameters:
Force acting on the car; F = 2000N.
Mass of the car; M = 1000 kg.
From Newton's second law of motion, we know that:
Force = mass× acceleration.
⇒ acceleration = Force/mass = 2000/1000 m/s² = 2 m/s².
Hence, the acceleration of the car is 2 m/s².
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Newton's "quantity of motion" is conservation.
True
False
Write a reflection about what you learned and how you can reduce your carbon footprint (ecological footprint)
Answer:
You could say that you learned that humans effect the ecosystem and many big ways. You can reduce ur footprint by recycling, riding bikes instead of cars, and eating more fruits and vegetables
Explanation:
Which tectonic plate boundary caused the structure that is circled in the image?
Answer:
Crust
Explanation:
A force that pushes or pulls is known as
O A.
an expected force.
B.
a reaction force.
OC.
an applied force.
a positive force.
Answer:
C
Explanation:
An applied force is a force that is applied to an object by a person or another object. If a person is pushing a desk across the room, then there is an applied force acting upon the object. The applied force is the force exerted on the desk by the person.
Answer:
C:
Explanation:
any force acting on an object is a positive force I believe.
Which statement uses the terms velocity and acceleration correctly?
A. Acceleration is the rate of change of velocity.
B. An object with a constant velocity cannot accelerate.
C. Acceleration is always in a straight line.
D. Acceleration is an increase in velocity.
E. Acceleration happens only in the same direction as the object is moving.
Option A: Acceleration is the rate of change of velocity.
Explanation:The statement that uses the terms velocity and acceleration correctly is option A: Acceleration is the rate of change of velocity. Acceleration is defined as the change in velocity over time, so it represents how quickly the velocity is changing. Option B is incorrect because even though an object with constant velocity has no change in speed, it can still accelerate if it changes its direction. Option C is also incorrect because acceleration can occur in any direction. Option D is incorrect because acceleration can be a decrease in velocity as well. Option E is incorrect because acceleration can happen in any direction.
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A student is writing a paper on her laptop while sitting on her couch. After some time the student feels her computer getting warm. Which of the following is most likely the explanation for this observation
The warmth felt by the student from her laptop most likely results from the heat generated by the computer's internal components. This is a common occurrence exacerbated by potentially blocked cooling vents when the laptop is used on a soft surface like a couch.
Explanation:When the student feels her laptop getting warm, it is most likely due to the heat generated by the computer's components as they work. Computers convert electrical energy into computational power, and during this process, some energy is lost as heat. This is a typical thermal phenomenon where the electronic components, like the CPU and GPU, produce heat as a byproduct of their operation. As more processes run on the laptop or the more intensive the tasks, the more heat is generated. This heat is usually dissipated by cooling mechanisms such as fans or heat sinks. However, when using a laptop on a soft surface like a couch, its cooling vents might be obstructed, which can cause the system to become warmer than it would on a hard, flat surface.
The scientific method might be applied to this observation by proposing hypotheses and conducting experiments. For example, a hypothesis could be, 'The laptop is warm because its cooling vents are blocked while sitting on the couch.' A relevant prediction in line with the hypothesis could be, 'If the laptop is placed on a flat, hard surface where its vents are unobstructed, then it will cool down and be less warm to the touch.' Testing such a prediction by observation and experimentation gives insight into the causes of thermal phenomena.
What do you want to learn about simple machines? (could someone come up with a question about simple machines for me)
Answer:
what are simple machines lol
Explanation:
___ discharge occurs when oppositely charged objects get close enough for the air between them to become electrically charged.
Answer:
Static discharge
Explanation:
Static discharge occurs when oppositely charged objects get close enough for the air between them to become electrically charged causing electrons to flow between the oppositely charged objects leading to spark. The flow of the electron is from one charged body to another charged body is what causes the static discharge.
Charges can be built through friction, this buildup of electric charges is known as static electricity.
Electrical discharge occurs when the electric field between oppositely charged objects exceeds about 3 * 10⁶ V/m, ionizing the air and enabling a current to flow in the form of sparks or corona discharge.
The phenomenon being described is known as electrical discharge, which occurs when oppositely charged objects are brought close enough together for the air between them to become electrically conductive. When the electric field between these objects exceeds a certain threshold - about 3 * 10⁶ V/m for air - the air molecules become ionized. This leads to the flow of current and discharge in the form of sparks, like lightning, or a more gradual event known as corona discharge.
When this happens, if air was ohmic, the current would increase steadily as the voltage difference increased. However, gases are generally nonohmic, so there is zero current until the voltage reaches a point where the electrical forces tear electrons away from air molecules. Subsequently, these free electrons and positive ions create a cascade that ionizes more air molecules, resulting in an impressive electrical discharge.
An object gains a negative charge by accumulating electrons, while losing electrons makes it positively charged. In nature, we see this during thunderstorms, where the friction between water and air particles in thunderclouds creates huge charges. The sudden release of these accumulated charges towards the ground is what we witness as a dangerous lightning strike.
Which phrases describe all the outer planets motion? Select two options
no rotation
fast rotation
LAH
slow revolution
opposite revolution
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ՍԻՈ
Answer:
slow revolution and fast rotation
Explanation:
A. The boat uses a heat engine to move. This is a simple schematic of how a heat engine operates. Describe what this schematic is showing in terms of the laws of thermodynamics. (6 points)
Answer: The internal heat energy of the boat heat engine, metamorphoses into mechanical workdone that causes the boat to move.
Explanation: First law of thermodynamics tells us that energy cannot be created nor destroyed, it can only be transformed from one form to another.
The internal heat energy of the boat heat engine, metamorphoses into mechanical workdone that causes the boat to move.
According to the second law of thermodynamics which state that when energy changes from one form to another form, or matter moves freely, entropy (disorder) in a closed system increases. Differences in temperature, pressure, and density tend to even out horizontally after a while
What would happen to the speed of sound wave if it moved from ocean water to air
Answer:
The speed of sound in water increases with increasing water temperature, increasing salinity and increasing pressure (depth). The approximate change in the speed of sound with a change in each property is: Temperature 1°C = 4.0 m/s.
Explanation:
Answer:
It would slow down.
Explanation:
Right on Edge!
PLEASE HELPPP!!! D:
A 62 kg person jumps from a window to a fire net 20.0 m directly below, which stretches the net 1.4 m. Assume that the net behaves like a simple spring. (a) Calculate how much it would stretch if the same person was lying on it. (b) How much would it stretch if the person jumped from 38 m?
a)___
b)___
Answer:
a is 4.6 x 10-2m
b is 1x8204m
Explanation:
The fire net is actually going past zero into a negative vertical displacement. Essentially because again, we're saying that why initial equals thirty eight meters. The person is falling down to zero meters. Zero meters is where the fire that is. And then after the person stretches the fire. Yet it has a certain vertical displacement. But this particles placement is negative. So here we're going to choose the negative value. so trying to see how much of the fire net would stretch if the person was lying on tough it and if the person jumped from a height of thirty eight meters. So for here Mass is going to be equal to sixty two kilograms and why initial for party is going to be twenty meters and then why final is going to be negative one point four meters And so in order to find in order to find this is an instance, essentially, this is an instance perspective in the sense that we need this data in order to figure out this during constant so we can see that energy initial equals energy final and then we consider it mg y initial equals mg.
It takes 300 N to move a box 10 meters in 10 seconds. How much power is
required?
O A. 100 W
O B. 3,000 J
C. 30,000 W
O D. 300 W
Answer:
I do t really know what's the answer but try it your self not uo but rude
In metal wires the charged particles that move are A. protons B. electrons C. neutrons D. none of the above
Answer:
the answer is B: electrons
Explanation:
Answer:
c
Explanation:
The earliest ideas of charge were the result of experiments by:
Benjamin Franklin
William Gilbert
Charles Coulomb
Isaac Newton
Answer:
The earliest ideas of charge were result of experiments by William Gilbert
Answer:
William Gilbert
1.What is the contour interval of this map?
Answer:
The contour interval of the map is 50
The direction of the magnetic field produced by an electric current will change when the direction of the ______ changes.
Answer:
Current
Explanation:
Your welcome
Answer:
Current
Explanation:
3. A pendulum with a 1.0-kg weight is set in motion from a position 0.04 m above the lowest point on the path of the weight.
What is the kinetic energy of the pendulum at the lowest point?
(Hint: Assume there is no friction.)
Answer: K.E = 0.4 J
Explanation:
Given that:
M = 1.0 kg
h = 0.04 m
K.E = ?
According to conservative of energy
K.E = P.E
K.E = mgh
K.E = 1 × 9.81 × 0.04
K.E = 0.3924 Joule
The kinetic energy of the pendulum at the lowest point is 0.39 Joule
Final answer:
The kinetic energy of the pendulum at the lowest point is 0.392 J, which is found by converting the initial gravitational potential energy into kinetic energy using the principle of conservation of energy.
Explanation:
To determine the kinetic energy of the pendulum at the lowest point, we use the principle of conservation of energy, which states that the total mechanical energy in a system remains constant if there is no friction.
We know that the pendulum starts with gravitational potential energy which is completely converted into kinetic energy at the lowest point. The potential energy (PE) at the starting point is due to its height above the lowest point and is calculated as PE = mgh where m is the mass, h is the height, while g is the acceleration brought on by gravity (9.8 m/s²).
Let's calculate the potential energy at the initial height:
PE = mgh
= (1.0 kg)(9.8 m/s²)(0.04 m)
= 0.392 J
Since there is no friction, this potential energy will be entirely converted into kinetic energy (KE) at the lowest point. Therefore, the kinetic energy at the lowest point is also 0.392 J.
How far does an object move if a 20 N force is applied to it doing 40 J of work?
Answer: The object moved 2 metres away
Explanation:
Given that the
Force applied F = 20 N
Work done W = 40 J
From the definition of workdone which state that: product of force and distance
W.D = F × S
Where S = distance
S = W.D/F
S = 40/20 = 2 metres
The object moved 2 metres away.
The energy carried by a wave is dependent upon its wavelength, frequency, and amplitude. So long as speed is constant, the energy of a wave will increase as a result of an increase in which of these characteristics?
The energy of a wave will increase with an increase in amplitude when the wave's speed is held constant. The amplitude of a wave is directly proportional to the energy it carries.
Explanation:
The energy of a wave is influenced by various factors such as its amplitude, frequency, wavelength, and speed. The question specifically focuses on how the energy will change, assuming speed is constant. Given a constant wave speed, it is the amplitude of the wave that, when increased, will result in an increase in the wave's energy. The amplitude is directly proportional to the energy carried by a wave – the greater the amplitude, the more energy the wave carries.
For mechanical waves, the energy transferred is proportional to both the square of the wave's amplitude and the square of its frequency. This means that if the frequency of the wave is doubled, the energy increases by a factor of four, assuming the amplitude remains the same. However, if the speed is kept constant, the energy increase resulting from an increase in frequency must be exchanged with a decrease in wavelength due to their inverse relationship. The essential point to remember is that, with speed being constant, increasing the amplitude of a wave will directly lead to an increase in its energy.
Ahmed saw all of these things as he walked to school this morning. Which one is an example of a force pushing downward toward the ground?
A. A bird sat on a telephone wire.
B. A woman moved her child from one place to another in a wagon.
C. A man pulled weeds in his garden
D. A dog tugged on a rope a child held
What is a tiny sheet of silicon containing an entire circuit with many different components? A. a binary circuit B. a coded circuit C. an integrated circuit D. a stationary circuit
The correct answer is C an integrated circuit.
Integrated circuits are tiny silicon sheets containing many components vital for modern electronics. They revolutionized technology by enabling miniaturization and high functionality in devices.
The correct answer is C. an integrated circuit. An integrated circuit is a tiny sheet of silicon that contains an entire circuit, including many different components such as transistors and diodes. These circuits are etched onto the silicon surface and are essential components in modern electronic devices, as they can hold billions of nanoscale components needed for various functions.
Integrated circuits revolutionized the way electronic devices are made, allowing for significant miniaturization and complexity in devices like computers and cell phones. The invention of the integrated circuit enabled the modern computer revolution by allowing vast amounts of electronic circuitry to fit into small chips, instead of requiring large rooms for the same technology.
Mirrors reflect light and lenses absorb light.
True
False
A box contains about 5.64 x 1021 hydrogen
atoms at room temperature 21°C.
Find the thermal energy of these atoms.
Answer in units of J.
Answer:
Explanation:
Given that,
The temperature of atom is 21°C
θ = 21 + 273 = 294K.
Then, from kinetic theory,
The kinetic energy of individual elements is
K.E = 2kT/3
k is Boltzmann constant
k = 1.38 × 10^-23 J/K•particle
Then,
K.E = 2 × 1.38 × 10^-23 × 294 / 3
K.E = 2.7048 × 10^-21 J/particle
Each particle of hydrogen is 5.64 × 10²¹ particle
Total K.E = 2.7048 × 10^-21 × 5.64 × 10²¹
Total K.E = 15.26 J
The sound from a loud speaker has an intensity level of 80 db at a distance of 2.0m. Consider the speaker to be a point source, how far from the speaker will the sound have an intensity level of 40 db.
Answer:
2.83m
Explanation:
The information that we have is
Intensity at 2.0 m: [tex]I=80dB[/tex] and [tex]r_{1}=2m[/tex]
we need an intensity level of: [tex]I_{2}=40dB[/tex]
thus, we are looking for the distance [tex]r_{2}[/tex].
which we can find with the law for intensity and distance:
[tex](\frac{r_{2}}{r_{1}} )^2=\frac{I_{1}}{I_{2}}[/tex]
we solve for [tex]r_{2}[/tex]:
[tex]\frac{r_{2}}{r_{1}}=\sqrt{\frac{I_{1}}{I_{2}} }\\\\r_{2}=r_{1}\sqrt{\frac{I_{1}}{I_{2}} }[/tex]
and we substitute the known values:
[tex]r_{2}=(2m)\sqrt{\frac{80dB}{40dB} }\\\\r_{2}=(2m)\sqrt{2}\\ r_{2}=2.83m[/tex]
at a distance of 2.83m the intensity level is 40dB
Need help now due in 5 minutes
Answer:
I'm positive it's the last one
Explanation:
Use the drop-down menus to complete the statements. are pure substances that cannot be broken down into a simpler form. are units of two or more atoms. are the smallest possible particles of an element. are pure substances made of two or more atoms of different elements.
Answer: Please see below
Explanation:
Are pure substances that cannot be broken down into a simpler form---- Element
are units of two or more atoms---- Molecule
are the smallest possible particles of an element---- an Atom
are pure substances made of two or more atoms of different elements---- Compound
An atom is the smallest unit of matter that consists of protons, neutrons and electrons. Eg the element, helium, contains atoms with two protons in the nucleus.
Eg of element, we have carbon, hydrogen, helium
Eg of a compound--- Ammonia
Eg of a molecule-----H2O (water),C6H12O6 (glucose)
Explanation:
An element is made up of
(One type of atom)