Answer:
A negative charged is induced on the balloon and the wool acquires a positive charge.
Explanation:
It gains negative electrons, therefore becoming negatively charged.
As charge cannot be created, nor destroyed, only transferred, this leaves the wool positive.
Option B. A negative charge is induced on the balloon and the wool acquires a positive charge.
They stick to each other.
It gains negative electrons, therefore becoming negatively charged.
A charge cannot be created, nor destroyed, only transferred, this leaves the wool positive.
Now that they have opposite charges, the two items attract.
What are 3 facts about electrons?Electrons are found free in nature (free electrons) and bound within atoms. Electrons are responsible for the negatively-charged component of an atom. In an atom, electrons orbit around the positively-charged atomic nucleus. In solids, electrons are the primary means of conducting current.
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A(n)
such as oxygen or carbon, is a pure substance.
Answer:it is a pure substance
Explanation:
All elements are pure substances because they are made up of only one type of atom
Answer: An element is the answer you’re looking for!
u will get POINTS......
answer it fast... someone...
brainliest will be awarded for sure....
→calculate the pressure exerted by a body having a mass of 30kg over an area of contact 400cm2.
also explain it clearly... for every step there should be explanation...
Explanation:
mass of the body=30kg
area on which it is exerting pressure=400 cm2 to m2
=4m2
pressure it exerts=?
the formula for finding pressur in physics is F/A where the mass of the body is the force implied while area is taken as area
therefore:pressure=F/A
=30/4
=7.5 kgm/s2
=
Answer:
7500 N/m²
Explanation:
The formula for finding pressure = force/area
force = 30 kg we convert this to newtons.this is because pressure is in N/m²
30 x 10 = 300N
Area = 400cm² we convert to m² = 400/10000 = 0.04
pressure = force/ area
pressure = 300/0.04 = 7500 N/m²
If you need any more explanation pls do mention in the comment section so that i can help more.
Hope this helps and if it does mark as branliest answer thx
Cereal plants gain chemical potential energy as they grow. Which form of energy is converted to create the chemical potential energy?
The plant absorbs the sunlight which serves as source of energy for the plant. Therefore, the form of energy which gets converted to “chemical potential energy is the solar energy”.
Explanation:
In process of photosynthesis, the plant makes the food and release oxygen, this occurs only in presence of solar energy that is sunlight. Therefore, the source of energy for the plants are sunlight which provides solar energy which is used up in energy conversion through various process.
The end product of the energy resource is the conversion to chemical potential energy gained over the growth of the cereal plants.
Both mechanical and electromagnetic waves _____. have compressions and rarefactions oscillate in the same direction as the wave motion transmit energy require a medium for transfer
Answer:
transmit energy
Explanation:
Waves (both mechanical and electromagnetic) are periodic perturbations of the space that transmit energy without transmitting matter. (so, "transmit energy" is valid for both types of waves).
The other statements are wrong because:
have compressions and rarefactions --> this is a property only of longitudinal waves, while electromagnetic waves are transverse, so they do not have compressions
oscillate in the same direction as the wave motion --> this is the description of longitudinal waves, while electromagnetic waves are transverse,
require a medium for transfer --> this is true only for mechanical waves: electromagnetic waves in fact do not need a medium to propagate.
Answer:
Both mechanical and electromagnetic waves transmit energy .
I hope this really helps!!!
Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery?
A. the current in the battery and in each resistor is the same
B. The current the battery equals to the sum of the currents in the resistors
c.The current in the battery is less than the current in either resistor
d. The current in the battery equals to the product of the currents in the resistors
B. The current the battery equals to the sum of the currents in the resistors describes the current in a circuit that is made up of any two resistors connected in parallel with a battery
What is a parallel combination ?
When two or more resistances are connected between the same two points, they are said to be connected in parallel combination
Resistors are connected in parallel combination , and its been known that if resistors are connected in parallel combination than current gets divided in each branch according to the value of resistance attached in that branch and voltage remains same across each resistance .
Also total current in the circuit or current in the battery is equal to the algebraic sum of current in each branch of the circuit
correct answer will be B. The current the battery equals to the sum of the currents in the resistors
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answer please 98 points also brainliest
the answer is D) The air in the aquarium is saturated
none of the other answers were realistic AND I took this before so I know the right answer.
Answer:
d.
Explanation:
Look at it this way, when a sponge is saturated it cannot take in any more water. When air (a mixture of gasses) is saturated it cannot take in any more water vapour and water vapour will condense out as liquid water. This is termed the saturation point.
Air is classed usually as a percentage of saturation, dry air being 0% and saturated 100%
However, unlike the sponge ananalogy, 1kg of air will have a different capacity for water vapour depending on its temperature (and pressure). Charts (Psycrometric Charts) are available that allow the degree of saturation to be calculated, usually by determining the dew point (temperature at which 100% saturation occurs) by using a wet bulb thermometer and comparing it with the normal dry bulb temperature.
how do you find the net force acting on an object?
a- find the reaction force
b- assume there is no friction
c- add all the force vectors
d- find the largest force on the object
Answer:
C. Add all the force vectors
Explanation:
The net force acting on an object is the vector sum of all the forces on the object.
Remember, Newton's first law tells us a body at rest will remain at rest or that in uniform motion will continue in motion unless acted by unbalanced forces.These unbalanced forces act in all direction towards the body thus to get the net force you require a summation of all these force with respect to their magnitudes and directions.
For example a force of 3N towards the East direction acting on a body and another force of 2N towards the West direction on the same body will generate a net force of 1N towards the East direction.
Final answer:
To find the net force acting on an object, one must add all the force vectors using both the x- and y-components to generate an accurate answer.
Explanation:
To find the net force acting on an object, one must add all the force vectors acting on the object (option c). This is known as the vector sum of all the forces or the net force in the x-direction or y-direction, depending on the orientation of the forces. When forces are at an angle, it's important not to forget about the x-components. Creating a free body diagram can help visualize and calculate the forces.
It’s essential to break down angled forces into their x- and y-components and then combine these components from all forces to generate an accurate answer for the net force.
For example, consider the free-body diagram of a shopping trolley. To find the resultant, or net force, one would draw all forces acting on the trolley, including its weight, normal force, friction, and any applied forces.
Then, after dividing any angled forces into their horizontal and vertical components, all forces in each direction are summed to find the net force in each direction, and from these, the overall net force on the trolley.
It's also important to understand that the net force is related to an object's acceleration, as per Newton's second law of motion, Fnet = ma, where Fnet is the net force, m is the mass of the object, and a is the acceleration.
VEICUL HC CICLE MICI.
Why is it important to warm up your muscles before a workout?
Answer:
You could become injured.
Explanation:
It is important to warm up your muscles before a workout because if you didn't you could pull a muscle or become seriously injured.
Answer:
To decrease your chance of injury
Explanation:
Suppose a balloon was tied to a pole. What happens?
Answer:
it wont fly away
Explanation:
depending how tight the knott and find it is going to be stuck to the pole
A balloon sticks to a sweater due to static electricity, and hair stands up when brought near a charged balloon. A helium balloon moves with the wind, so a flag will not wave unless there's a change in motion. Hot air balloons rise because of a buoyant force, and releasing a filled balloon demonstrates Newton's third law of motion.
The phenomenon of a balloon sticking to a sweater after being rubbed against it is explained by static electricity. When the balloon is rubbed against the sweater, electrons are transferred from the sweater to the balloon, giving the balloon a negative charge and the sweater a positive charge. Due to the attraction between opposite charges, the balloon sticks to the sweater. Bringing the charged balloon close to your hair, which has a neutral charge, will result in your hair standing up due to the attractive force exerted by the balloon's excess electrons.
When you bring a candle close to a balloon, the heat may cause it to pop, resulting in a loud bang. If you are a passenger in the open basket hanging under a helium balloon, and the balloon is being carried along by the wind at a constant velocity, a flag held in your hand will not wave because you, the flag, and the balloon are all moving at the same velocity relative to the wind. However, if there is a gust of wind or an acceleration of the balloon, the flag might wave in the opposite direction of the wind or acceleration.
Hot air balloons rise because the hot air inside is less dense than the surrounding cooler air, creating a buoyant force. This principle is also used in the take-home experiment involving a balloon filled with air or water. When released, the balloon propels in the opposite direction of the expelled air or water, demonstrating Newton's third law of motion: for every action, there is an equal and opposite reaction.
in an exothermic chemical reaction the energy gained by the surroundings must be _______ the energy lost by the reaction
Most be equal to the energy lost by reaction
The energy gained by the surroundings must be greater than the energy lost by the reactants in an exothermic reaction.
Explanation:
Exothermic reaction is a chemical reaction in which the energy from the reaction is transferred to the surroundings and so the products and the reactants in the reaction have lesser energy compared to the energy gained by the surroundings.
For example, thermal decomposition of compounds in carbonates. So it must be greater than the energy that is lost by the reactants in an exothermic reaction.
26. A 40 kg boy jumps from a height of 4m onto a plate-form mounted on springs. As the
spring compress, the plate-form is pushed down a maximum distance of 0.2 cm below its
initial position, and it then rebounds. What is the loss in potential energy by the boy?
a. 800J
b. 1080J
c. 1600J
d. 1680 J
Answer:
c. 1600J
Explanation:
The loss in potential energy of the boy is given by:
[tex]U=mg \Delta h[/tex]
where
m = 40 kg is the mass of the boy
g = 9.8 m/s^2 is the acceleration of gravity
[tex]\Delta h = 4 m + 0.02 m = 4.02 m[/tex] is the total change in the height of the boy (4 metres + 2 cm due to the compression of the spring)
Substituting, we find
[tex]\Delta U = (40 kg)(9.8 m/s^2)(4.02 m) = 1577 J \sim 1600 J[/tex]
CuSO4 is__
an acid
a base
a salt
Answer:
Salt
Explanation:
An acid is a compound that has H as its metal as HCl
A base is a compound that has OH as its nonmetal as in KOH.
A salt has neither, and that's what this is (CuSO4)
World class speed skaters can skate a 3,000-m course in about 4 minutes.
What is their average speed for this course?
A. 12.5 m/s
B. 1.33 m/s
C. 1.25 m/s
D. 13.3 m/s
Answer:
a
Explanation:
3000 m / 4 minutes = 720 ave speed per minute
720 / 60 seconds = 12.5 m/s
Entropy can only be decreased in a system if
Final answer:
Entropy can only be decreased in a system if energy transfer occurs. When energy is transferred into a system, it can decrease the entropy of that system.
Explanation:
Entropy can only be decreased in a system if energy transfer occurs. When energy is transferred into a system, it can decrease the entropy of that system. For example, if you gather marbles scattered around a room and put them into a cup, you are decreasing the entropy of that system through your work. Similarly, energy from the Sun can decrease the entropy of local systems on Earth. However, it is important to note that the overall entropy of the rest of the universe increases, to satisfy the second law of thermodynamics.
Which of the following is one way that technology can improve procut
?
Answer:
Answer: C. Machines replace workers and eliminate human effort from the production process.
This is sad but true. By replacing the human workers, product cost and productivity increases as the machines now a days can perform tasks both faster and more accurately than humans. The productivity will rise also because of the lessening of human error when it comes to production lines.
Explanation:
Please mark brainliest and have a great day!
The correct option is: C. Machines replace workers and eliminate human effort from the production process.
Option C suggests that technology can improve productivity by replacing human effort with machines, specifically through automation. This process can lead to increased efficiency, reduced production time, and cost-effectiveness. Machines can handle repetitive tasks at a faster rate and with precision, potentially enhancing overall output. However, it's important to note that this can also result in job displacement for certain roles. While automation can streamline processes and reduce manual labor, its implementation requires careful consideration of its societal and economic implications. Therefore, the effectiveness of technology in improving productivity depends on how it is integrated and managed within the broader context of the workforce and industry.
Complete Question:
Which of the following is one way that technology can improve productivity?
A. Powerful machines are less dangerous to industrial workers.
B. Better methods of production allow workers to earn higher wages.
C. Machines replace workers and eliminate human effort from the production process.
D. The assembly line enables more workers to participate in the production process.
which air mass would produce warm,humid weather in the summer?
Answer:
Maritime tropical
Explanation:
The maritime tropical air mass typically produce warm, humid weather in the summer.
Answer:
The correct answer is the maritime tropical air masses.
Explanation:
These air masses are loaded with moisture with the water on which they are produced and heated as well. These air masses are form over the ocean in the hot areas of the Gulf of Mexico and the tropics.
Later they move towards the north, which brings an increase of humidity and hot winds to the United States. This phenomenon generates an increase in the probability of rains and generally occurs in the summer season in the southern states of the country. But nevertheless they can be formed throughout the year.
25 points, plus brainiest if answer is correct. Please i don't have much time.
Electromagnetic waves who's photons carry the highest energy also have the:
A.) shortest wavelengths
B.) strongest positive charges
C.) lowest frequency
D.) highest amplitude
The wind pushes a cup along the sand at the beach. The force of the wind was 17.8N, and the opposing force was 2N. If the cup accelerates at 7m/s^2, how much does the cup weigh?
Explanation:
Let's begin with the cup's free body diagram (figure attached), there we are able to see the forces acting on this object:
On the X axis:
[tex]F_{x}=F_{1}+F_{2}[/tex] (1)
Where:
[tex]F_{1}=17.8N[/tex] is the force of the wind
[tex]F_{2}=-2N[/tex] is the opposing force (that is why it has the negative sign)
So:
[tex]F_{x}=17.8N-2N=15.8N[/tex] (2)
In addition we know by Newton's 2nd law:
[tex]F_{x}=m.a[/tex] (3)
Where:
[tex]m[/tex] is the mass of the cup
[tex]a=7m/s^{2}[/tex] is its acceleration
Substituting (2) in (3):
[tex]15.8N=m(7m/s^{2})[/tex] (4)
Finding [tex]m[/tex]:
[tex]m=\frac{15.8N}{7m/s^{2}}=2.25kg[/tex] (5)
On the other hand we have the forces acting on the Y axis:
[tex]F_{y}=N-W=0[/tex] (6)
Where:
[tex]N[/tex] is the normal force
[tex]W=m.g[/tex] is the weight of the cup, being [tex]g=9.8m/s^{2}[/tex] the acceleration due gravity
This means:
[tex]N=W=m.g[/tex] (7)
Substituting (5) in (7):
[tex]W=(2.25kg)(9.8m/s^{2})[/tex] (8)
Finally:
[tex]W=22.05N[/tex] This is the weight of the cup
On a hypothetical scale X The ice point is 40° and steam point is 120°.
For another scale Y the ice point and steam points are -30° and 130° respectively if X reads 50° The reading of Y is?
Answer:
The reading of Y is -10°.
Explanation:
For scale X, the ice point is 40° and steam point is 120°.
Difference between the two extremes for scales X = 120 - 40 = 80
For scale X, the ice point and steam points are -30° and 130° respectively.
Difference between the two extremes for scales X = 130 - (-30) = 160
Comparing both scales:
One unit of scale X = x
One unit of scale Y = y
Scale X has 80 divisions while scale Y has 160
80x = 160y
x = 2y
50° in scale X = 10x + ice point in X scale
10 divisions in Y scale = 20y
Reading of Y scale = ice point of Y + 20y
= -30° + 20°
= -10°
6. Shyam's motorcycle accelerated from 2m.s
to 10m/s in 10s. Find the distance the
motorcycle travels.
a) 120m
b) 5m
c) 60m
d) 24m
Answer:
The answer is c).
Explanation:
[tex]v_0 = 2 \frac{m}{s} \\ v_1 = 10 \frac{m}{s} \\ t = 10s \\ \\ s = unknown \\ \\ a = \frac{v_1 - v_0}{t} \\ a = \frac{10 \frac{m}{s} - 2 \frac{m}{s} }{10s} = 0.8 \frac{m}{ {s}^{2} } \\ \\ s = v_0t + \frac{a {t}^{2} }{2} \\ s = 2 \frac{m}{s} \times 10s + \frac{0.8 \frac{m}{ {s}^{2} } \times {(10s)}^{2} }{2} = 60m[/tex]
I dont get how to do the electron cloud model, can someone please tell me how in simple words. I have been lost and dont know anything on how to do the electron cloud model.
Answer:
whats the question
Explanation:
12. A body is a particular amount of matter. It can be a solid, liquid or gas. It can be described as existing in
A. size and shape.
B. motion and force
C. time and space.
D. location and movement.
Answer:
A body is a particular amount of matter. It can be a solid, liquid or gas. It can be described as existing in time and space.
Explanation:
Answer:
c. Time and space.
Explanation:
A body is a particular amount of matter. it can be solid,liquid or gas. It can be described as existing in Time and space.
Acceleration involves a change in speed or what?
Answer:
Velocity would be your answer.
A value that describes how heavy an object is and is related to the force of gravity is
Answer:
mass
Explanation:
The heaviness of an object with the relation to force of gravity, is described by the ‘weight’
Explanation:
The heaviness of the object is referred to the mass of the object. When the mass of the object is concerned it is taken in space or vacuum where force of gravity do not exist.
Therefore, to value the actual heaviness of the object, mass is multiplied by the component of force of gravity, is termed as weight.
[tex] \bold{\text { Weight }=\text { Mass } \times \text { Accleration due to gravity }} [/tex]
Which of the following examples illustrates static friction?
A box sits stationary on a ramp.
A ball rolling on the lawn eventually comes to rest.
A car rounds a curve on a road.
A fish swims upstream.
Answer:
A box sits stationary on a ramp
Explanation:
Static friction is a force which keeps an object at rest as it is in the case of the box. It has to be overcome for the object to be set into motion.
Static force of friction is calculated as follows:
F= μη
F is static force of friction.
μ is the coefficient of static friction.
η is the normal force.
what is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ?
a. 10%
b. 20%
c. 80%
d. 25%
Answer:
b. 20%
Explanation:
Efficiency of an engine is a ratio in percentage of the work done to the energy intake of the engine.
η=(Q₁-Q₂)/Q₁×100%
η is efficiency, Q₁ is the energy intake, Q₂ is energy wasted.
The information provided is:
Energy intake = 400 J
Work done = 80 J = (400-320) =Q₁-Q₂
Energy wasted =320 J
η= 80/400×100%
=20%
Answer:
B.20 %
Explanation:
20pts.
The edge of a flying disc with a radius of 0.13 m spins with a tangential speed of 33 m/s
The centripetal acceleration of the edge of the disc is?
Answer:
84 m/s2.
Explanation:
A. 0.0051
B. 0.43
C. 25
D. 84
Answer:
84 m/s^2
Explanation:
the coefficient of kinetic friction between a couch and the floor is 0.81. if the couch has a mass of 71 kg and you push it with a force of 650 n, what is the net force on the couch as it slides?
a: 696 n
b:86 n
c: 46 n
d:331 n
Answer:
B: 86 N
Explanation:
There are four forces acting on the couch. Weight pulling down, normal force pushing up, your applied force to the right, and friction opposing you to the left.
In the y-direction:
∑F = ma
N - W = 0
N = W = mg
In the x-direction:
Fnet = P - Fᵣ
Fnet = P - Nμ
Fnet = P - mgμ
Given P = 650 N, m = 71 kg, g = 9.8 m/s², and μ = 0.81:
Fnet = 650 - (71)(9.81)(0.81)
Fnet = 86 N
Which of these metals are magnetic?
Answer:
If iron, nickle, or cobalt is an answer choice, those are the three metals that are purely magnetic.
Ella uses a camera as a model of the eye. The film in the camera serves the same role as which part of the eye?
lens
pupil
sclera
retina
Answer is :
retina- last choice
The film in a camera serves the same role as the d) retina in the eye.
Both the film and the retina are responsible for capturing images. In a camera, light enters through the lens, passes through the aperture (similar to the pupil), and is focused onto the film, where the image is recorded. Similarly, in the human eye, light passes through the cornea and lens, is focused by the lens, and hits the retina at the back of the eye.
The retina contains photoreceptor cells that convert the light into electrical signals, which are then sent to the brain for processing, forming the image we see. Therefore, the film in the camera acts as the light-sensitive part that captures and stores the image, just like the retina functions as the light-sensitive layer that detects and processes visual information in the eye.