Answer:
they transfer Matter and energy
D An Erlenmeyer flast of Surface area 0.5m² and wall thickness 2cm is filled with water at 0°C The Erlenmeyer Flask is then immersed in a glass beaker filled with water at a temperature of 30°C. what is the heat current?
The heat current in the Erlenmeyer flask is 448.5 W.
What is Heat current?
Heat current or heat flow rate is the quantity of heat transferred in a given period of time.
[tex]Q = \frac{kA \Delta \theta }{L}[/tex]
where;
Q is the heat currentk is thermal conductivity of water = 0.598 W/m.KL is thicknessA is areaΔθ is change in temperature[tex]Q = \frac{0.598 \times 0.5 \times (30-0)}{0.02} \\\\Q = 448.5 \ W[/tex]
Thus, the heat current in the Erlenmeyer flask is 448.5 W.
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a sprinter starting from rest reaches final velocity of 18.0 mi/h. What is her average velocity?
Answer:
9m/s
Explanation:
Average velovity= (Initial velocity+Final velocity)/2
or A.V=(0+18)/2
or A.V= 9m/s
A sprinter starting from rest reaches final velocity of 18.0 mi/h. The average velocity of the sprinter is 9.0 mi/h.
Given that the sprinter starts from rest and reaches a final velocity of 18.0 mi/h, we can assume that the sprinter accelerates uniformly. Therefore, her average velocity would be the average of her initial velocity (0 mi/h) and her final velocity (18.0 mi/h).
Average velocity = (Initial velocity + Final velocity) / 2
Average velocity = (0 mi/h + 18.0 mi/h) / 2
Average velocity = 18.0 mi/h / 2
Average velocity = 9.0 mi/h
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How might having a testing site like the "Mars Yard" be helpful in mission planning? Provide an example of how this might help scientists solve a problem during a mission.
Your answer should include at least two complete sentences.
Be sure to check your grammar and spelling.
Testing site provides real environment to the scientists.
How testing site help the scientists to solve problem?This type of site might help scientists to solve a problem during a mission because the site provides real environment and similar problems comes to the scientist which can be solved so that the real experiment can't experience such type of difficulties so we can conclude that testing site provides real environment to the scientists.
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a rectangular container measuring 20cmX20cmX30cm is filled withn water.What is the mass of the voulme of water in kilogram and in grams?
Answer:
12,000 grams = 12 kg
Explanation:
Volume V = 20 x 20 x 30 cm³ = 12,000 cm³
density of water d = 1 g/cm³
so the mass is 12,000 grams = 12 kg
A force is exerted on a box and an equal and opposite force is exerted by the box. What will happen to the box?
Explanation:
The box will undergo an acceleration. Due to Newton's 3rd Law, any action causes an equal and opposite reaction. The equal and opposite force from the box will not cancel the force that you are applying.
Answer:
The box will not move as it is in a a stable condition
Explanation:
when an equal and opposite force acts on a body the effects of forces cancels out. provided the body can withstand the tensile and compressive actions of the forces. when both forces are coming together it leads to compression while tension refers to forces moving away fro, each other.
Based on the latitude you estimated, predict how much energy is transferred from the sun to the surface, and then to the air in your city.
A low latitude, the energy transferred from the sun is high while at a high altitude the energy transferred from the sun is low.
Effect of latitude on energy transferred from the sunLatitude is an angle which ranges from 0 degree at the Equator to 90 degrees at the poles of the Earth.
At higher latitudes, the sun's rays are less direct and a lower latitude the ray's of the sun are more direct. The farther an area is from the equator, the lower its temperature.
Thus, a low latitude, the energy transferred from the sun is high while at a high altitude the energy transferred from the sun is low.
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A current is induced by moving a magnet in and out of a coil of wire. What will happen to the induced current if you move the
magnet twice as fast?
A. Nothing. The induced current will not change.
B. The induced current will decrease
C. The induced current will increase
D. The induced current will change directions
Answer:
1. The induced current will increase.
2. The ammeter will detect an increase in current, and the compass will detect a stronger magnetic field.
3. the ratio of incoming and outgoing voltages
4. Voltage and electric current are induced.
100%
The induced current will increase.
What are faraday's law? What is Maxwell - Faraday equation?Faraday's law states that the electromotive force around a closed path is equal to the negative of the time rate of change of the magnetic flux enclosed by the path.or
Faraday's law states that the emf is also given by the rate of change of the magnetic flux. Mathematically -[tex]${\displaystyle {\mathcal {E}}=-{\frac {\mathrm {d} \Phi _{B}}{\mathrm {d} t}}}[/tex]
Maxwell–Faraday equation states that a time-varying magnetic field always accompanies a spatially varying (also possibly time-varying), non-conservative electric field, and vice versa. Mathematically -[tex]$\nabla \times \mathbf {E} =-{\frac {\partial \mathbf {B} }{\partial t}}[/tex]
or
[tex]${\displaystyle \oint _{\partial \Sigma }\mathbf {E} \cdot \mathrm {d} \mathbf {l} =-\int _{\Sigma }{\frac {\partial \mathbf {B} }{\partial t}}\cdot \mathrm {d} \mathbf {A} }[/tex]
Given is that a current is induced by moving a magnet in and out of a coil of wire.
As the magnet moves twice as fast, then the rate of change of magnetic flux will increase and hence the induced current will increase.
Therefore, we can conclude that the induced current will increase.
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is paper an insulator or a conductor?
Answer:
Paper is an insulator.
Please mark as brainliest
Answer:
Paper is an insulator because it don't allow heat to pass or flow through them.
Conductor
•Are materials that can transfer heat easily.
•Allowing heat to transfer freely through them.
Ex: cooking pan
silver
metal spoon
nail
Insulator
Are materials that do not allow heat to pass through them.
Ex: rubber
wood
leather
plastic
paper
What are the six functions of a root
Answer:
hold the plant in the ground
keep the plant upright
absorb water from the soil
take in nutrients from the soil
transport water and nutrients to the plant
provide a place for food storage
Explanation:
The plants are very complex organisms and can be classified into various types based on certain characteristics. The roots are very important structures which provide a lot of functions.
What are roots?The roots are the important underground part of all the vascular plants. This part of the plant is generally responsible for anchoring it down into the ground and absorbing all the essential minerals, nutrients, and water from the soil.
The root of the plant also help us to store the food. The roots are not the reproductive part of the plants, they are called the vegetative parts. In certain plants, the roots are the means of reproduction. This type of reproduction is called the vegetative reproduction.
The roots also check the soil erosion, provide sustenance and also habitat for various organisms. The root absorb water and minerals from the soil and help in the process of photosynthesis.
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A generator spins and does 64,000 J of work in 200 seconds. What is the power of the generator?
Answer:
L = V × I × t
P = V × I then
P = L/t
P = 64000J/200s= 320W
answer : P = 320 W
........
A 615 N student standing on a scale in an elevator notices that the scale reads 645 N. From this information, the student knows that the elevator must be moving
a) downwards
b) upwards
c) you cannot tell if it is moving upward or downward.
I thought the answer would be B but it says it is C
A 615 N student standing on a scale in an elevator notices that the scale reads 645 N. From this information, the student cannot tell that if the elevator is moving upward or downward. The correct answer is option C.
The reason for this is that the scale reading depends not only on the weight of the student but also on the acceleration of the elevator. If the elevator is accelerating upwards, the scale will read more than the actual weight of the student.
Similarly, if the elevator is accelerating downwards, the scale will read less than the actual weight of the student.
In this case, we know that the scale reads 645 N, which is 30 N more than the actual weight of the student (615 N).
However, we don't know whether the elevator is accelerating upwards or downwards. It could be accelerating upwards with an acceleration of 3 m/s^2 (in which case the apparent weight would be 645 N), or it could be accelerating downwards with an acceleration of 3 m/s^2 (in which case the apparent weight would be 585 N).
Therefore, based on the information given, we cannot determine whether the elevator is moving upwards or downwards. The correct option is c.
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Which energy transformation occurs when a butane lighter is lit?
When a butane lighter is lit, chemical energy transforms into heat energy.
What is law of conservation of energy?
Energy cannot be created or destroyed, says the law of conservation of energy. However, it has the ability to change its form. The total energy of an isolated system is constant when all sources of energy are taken into account.
The chemical energy is the bonds of chemical molecules contain energy. Exothermic reactions are those in which chemical energy is released during the reaction, frequently in the form of heat.
In butane energy is stored as a chemical energy as bonds of chemical molecules and when it is lit, the chemical energy of the butane transforms into heat energy.
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Why does the Law of Conservation of Matter/Mass/Energy support climate change research?
A. The energy we use constantly being destroyed.
B. The energy we use is created every time we use electricity
C. The energy we use cycles throughout our world, always balanced, creating a stable climate.
D. The energy we use is released into the atmosphere, creating loop of continual absorption and releasing of heat
The law of conservation of energy supports climate change research because the energy we use is released into the atmosphere, creating loop of continual absorption and releasing of heat.
Law of conservation of energyThe law states that energy can neither be created nor destroyed but can always be converted from one form to another.
In light of this, any energy used by humans or natural processes is not destroyed. Instead, they are converted into another form or released into the atmosphere.
In the atmosphere, absorption and release of heat energy by greenhouse gases and irradiation create a loop. This loop causes a net heating or cooling of the planet, a phenomenon that affects the climate.
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If the pressure on a gas is increased, the particles will __(blank)__.
Group of answer choices
move closer together, decreasing the volume
will stay about the same distance apart and move faster
move farther apart, increasing the volume
will stay about the same distance apart and move slower
Answer:
move closer together, decreasing the volume
Explanation:
What is a reflex? (This is an easier question)
A. Behavior that does not involve the forebrain, or "higher" centers of an animal's brain.
B. Part of the nervous system that connects the sensory receptors to the muscles.
C. A focused, conscious decision to send a signal to a body part.
D. Similar nerve cells grouped together in a nervous system.
Brainliest for whoever is right :)))
Answer:
I pretty sure the answer is A " Behavior that does not involve the forebrain, or "higher" centers of an animal's brain."
Explanation:
I say this because it is bassicaly saying you body and brain does this without think which is a reflex. Such as geting your knee tapped with a rubber hamer it shoots up with out thinking about it.
Answer:
Pretty sure it's B. However, I am not positive.
Explanation:
21. A cyclist travels 15 km in 30 minutes. What is the average speed of the biker in km/hr?
Calculate the force of your body on the ground. (Use your weight in pounds x 4.45 because 2.2lbs=kg)
Answer:
2.8ibs=kg check with someone else im not for sure.
Explanation:
if you divide 10 divided by 2 it gives you 5 and then subtract it by 2.2 = 2.8
there goes your answer.
An object is moving to the left
at a constant speed. Its
acceleration is:
A. Positive
B. Negative
C. Zero
what happens if you leave a drink on top of the car and drive off
Answer:
it spills or sometimes it doesn't
Explanation:
depends on the road and speed
The law of motion that states that if one object exerts a force on another object, the other object exerts an equal force back on the first object is
A. Newton's second law.
B. Newton's third law.
C. Newton's first law.
D. Newton's law of inertia
Answer:
B
Explanation:
For every action,there is an equal but opposite reaction.
A basketball player is standing on the floor from the basket as in Figure Assuming that the height of the basket and player are of the same height. He shoots the ball at angle 45 o with the horizontal. The height covered through the trajectory is 2.05 m 0 = 45° O ji 18°C Clear ло ENG US 19
The ball will operate under the laws of parabolic projectile motion and possess features sure as
The acceleration of the basketball at the highest point in its trajectory is a=0
What is are the characteristics of the throw?Question Parameters:
the basket and player are of the same height.
He shoots the ball at angle 45 o
The height covered through the trajectory is 2.05 m 0 = 45°
The ball will create a parabolic shape to make a basket
Generally, the equation for the projectile motion is mathematically given as
y = (tan θ0)x – gx2/2(v0cosθ0)2
Therefore
This formula will calculate the motion of the ball.
With the y as its vertical representation and x as its horizontal representation
In conclusion, characteristics of the throw
The acceleration of the basketball at the highest point in its trajectory isa=0
The height of the ball is given as h =Usin\thetaRead more about Motion
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a bicycle dynamo emits light only when the bicycle is on motion,why
Answer:
because the friction/movement of the bikes wheels, generates electricity and energy that the light can use to generate electricity and it also does not have a battery on it and relies on the wheels to generate the electricity for the light to work.
Explanation:
A box has a mass of 5.8 kg. the box is lifted from the garage floor and placed on a shelf. if the shelf is 2.5 m high, what is the potential energy of the box?
PE = mgh
PE = 5.8 x 9.8 x 2.5
PE = 142.1 J
the answer is 140 J and my work is on the paper, hope it helps!
how could you find out which materials are the best sound insulators?
Answer:
See down
Explanation:
Airborne Testing
In order to rate the airborne sound insulation of a party element, speakers are used to generate white noise, usually at levels of around 100 decibels, in the source room. Then, using a moving microphone technique, the average sound pressure level is measured the other side of the element in question.
which of the following is a true statement about the physical characteristics of the sun.
Answer:
The sun's interior is similar to the Earth's; it has a core, mantle, and crust
Which of the following Illustrates 2 resistors in a series circult? A, B, C, D.
Answer:
It's either B or D, I'm not positive which it is
Explanation:
Answer:
The answer is B.
Explanation:
The two resistors are in the same square space, while the others are not.
If we are viewing the atom in such a way that the electron's orbit is in the plane of the paper with the electron moving clockwise. Find the magnitude of the electric field that the electron produces at the location of the nucleus (treated as a point). Express your answer in newtons per coulomb.
The magnitude of the electric field that the electron produces at the location of the nucleus is 5.13 x 10¹¹ N/C.
Electric field strength of the electronThe magnitude of the electric field strength of the electron is the force experienced in the field per unit charge.
[tex]E = \frac{F}{Q} = \frac{kQ}{r^2}[/tex]
where;
Q is the charge of the electronr is the distance of the electron from the nucleusThe magnitude of the electric field strength is calculated as follows;
[tex]E = \frac{(9\times 10^9) \times (1.6 \times 10^{-19})}{(5.3 \times 10^{-11})^2} \\\\E = 5.13 \times 10^{11} \ N/C[/tex]
Thus, the magnitude of the electric field that the electron produces at the location of the nucleus is 5.13 x 10¹¹ N/C.
Complete question is below:
In the Bohr model of the hydrogen atom, the electron moves in a circular orbit of radius 5.3 x 10^-11 m with a speed of 2.2 x 10^6 m/s.
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Can you name a competition or sport in which the higher score does not actually win? Please list as many of these competitions or sport
Answer:
Fastening-run & High-Jumping
Three children are sitting on a merry-go-round while a fourth child is pushing on the outside edge with a constant force. Why does it take less time for the fourth child to speed the merry-go-round up if the three other children all sit in the center rather than half way between the center and outside edge?
Answer:
I the moment of inertia is less if the other children sit in the center
Τ = I α the angular acceleration will be greater for a given torque Τ
A uniform disc of inertia 75kgm and the radius of gyration 3m rotates with angular velocity of 2 rads. Determine the mass
Answer:
I= 1/2 mr^2 solve for mass m.
radius given
angular momentum: I*w=I*2
KE= 1/2 I w^2= 1/2 I *2^2
Explanation:
The mass of the uniform disc at the given moment of inertia is determined as 16.67 kg.
Conservation of angular momentumThe mass of the uniform disc is calculated from the moment of inertia of the disc.
I = ¹/₂mr²
2I = mr²
m = (2I)/r²
where;
m is mass of the discI is moment of inertiar is radius of the discm = (2 x 75)/(3²)
m = 16.67 kg
Thus, the mass of the uniform disc at the given moment of inertia is determined as 16.67 kg.
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