Answer:
b
Explanation:
The statement which represents an endothermic reaction is using a heat pack on an injury.
What is an endothermic reaction?An endothermic reaction is a type of chemical reaction that absorbs heat energy from the surroundings. In other words, in an endothermic reaction, energy is taken in from the environment as the reaction proceeds, resulting in a decrease in the temperature of the surroundings.
Endothermic reactions require an input of energy to occur, usually in the form of heat, light, or electricity. This energy is used to break the bonds between atoms or molecules in the reactants, and the products formed have higher potential energy than the reactants. The excess energy is absorbed from the surroundings to compensate for this increase in potential energy.
Examples of endothermic reactions include melting ice, evaporating water, and baking soda reacting with vinegar to produce carbon dioxide gas. These reactions require an input of energy to occur and absorb heat from the surroundings, resulting in a decrease in the temperature of the surrounding environment.
Here in this question,
Endothermic reactions absorb heat energy from the surroundings, meaning that they require energy input to proceed. In the case of using a heat pack on an injury, energy is required to activate the reaction that produces heat and provides warmth to the injured area. This process absorbs heat from the environment, making it an endothermic reaction.
In contrast, wood burning in a fire and TNT exploding are exothermic reactions because they release heat energy into the surroundings, which means that they produce heat as a byproduct. The splitting of a gas molecule is not an endothermic or exothermic reaction, but rather a chemical reaction that can be either endothermic or exothermic depending on the specific reaction and conditions involved.
Therefore, The correct answer is using a heat pack on an injury.
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The EMF does not depend on which of the following?
A. The magnetic field strength
B. The number of electrons in the magnetic field
C. The velocity of the wire in the field
D. The length of the wire in the magnetic field
Answer:
Explanation:
When a wire of length L is moved with velocity v , perpendicular to magnetic field B , EMF will be produced at its two ends . EMF can be calculated with the help of following expression
EMF = BLv
As per this formula , EMF produced will not depend upon number of electrons in the magnetic field.
So B is the right choice.
A 90N force towards postive x-axis, A 50N force towards negative x-axis applied on 5kg object. Find:- A) the net force on the object and B) the acceleration of the object
Answer:
a. Net force = 40 Newton.
b. Acceleration = 8m/s²
Explanation:
Given the following data;
Force on postive x-axis = 90N
Force on negative x-axis = 50N
Mass = 5kg
a. To find the net force;
Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.
The net force is equal to the difference between the two forces applied because they are acting in opposite directions.
Net force = 90 - 50
Net force = 40N
b. To find the acceleration;
Acceleration = net force/mass
Acceleration = 40/5
Acceleration = 8m/s²
This graph shows a supply curve. A graph titled Supply Curve has Quantity Supplied on the x-axis, from 0 to 50 in increments of 10, and price on the y-axis, from 0 to 15 dollars in increments of 5 dollars. A line is drawn with points (10, 5 dollars), (20, 7 dollars), (30, 10 dollars), (40, 13 dollars), and (40, 15 dollars). What happens when the price of a good increases? The quantity of goods that are produced increases. The producer of the good is certain to make less money. The quantity of goods that are produced decreases. The quantity of goods that are produced stays about the same.
Answer:
A just took the quiz on edge
Explanation:
In the supply curve, when the price of a good increases, A. The quantity of goods that are produced increases.
What is supply?Supply simply means the quantity of goods and services that a supplier is willing to sell at a particular place, price and time.
In this case, when there's an increase in the price of goods, it should be noted that producers will supply more of the goods. This is done in order to generate more revenue.
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A horse accelerates from rest at 3 m/s2. How long does it take to reach a speed of 12 m/s?
Answer:
it will take 4.0 seconds
In order to have an airplane ascend, it needs to have more___
than weight. *
Drag
Weight
Lift
Thrust
Answer:
drag weight lift thrust
I’ll love you forever if you help me <3
A 1.0 kg toy car is released at the top of a frictionless track on the left and rolls off of the track from its right
side ramp. The car starts at a height of 0.80 m, goes through a 0.50 m diameter loop, and exits the ramp at a
height of 0.25 m.
Answer: -5.4
Explanation:
Khan said so
Answer:
2.5 J
Explanation:
What is the change in the car gravitational potential energy from A-B
What is the charge of electron?
Answer:
negative I hope u got ur answer mate
In what areas is the Big Bang theory inadequate or weak?
what are newtons laws of motion?
Answer:
In classical mechanics, Newton's laws of motion are three laws that describe the relationship between the motion of an object and the forces acting on it. The first law states that an object either remains at rest or continues to move at a constant velocity, unless it is acted upon by an external force.
Explanation:
Some problems with the digestive system make it very difficult for the body to digest enough food. Why would it be harder to exercise when you have a digestion problem like this?
Answer:
If your body did not digest enough food, you would not have the energy to exercise. Food is like fuel for the body.
Explanation:
Question 5
5. What subatomic particle has no electrical charge?
•neutron
•proton
•electron
•atom
Answer: A Neutron.
I know this is correct. Thank's and yw :3
A plane mirror forms an image of an object because it ____________ light from the object.
Answer:
reflect
Explanation:
In order to see the image of an object in a mirror, you must sight at the image; when you sight at the image, light will come to your eye along that line of sight.
7) When you place a metal saucepan on the heating element of a stove, heat is transferred from the element to the saucepan by:
A reflection.
B convection.
C conduction.
D radiation.
8) Which of the following can be described as being luminous :
A Streetlights (turned on)
B A road sign
C The moon
D Water
9) In the burning of fireworks during New Year displays, chemical potential energy is converted into:
A heat, light and sound energy.
B light and sound energy.
C sound and heat energy.
D gravitational potential energy and light.
10) Which would be the most appropriate description of how energy is distributed when a torch is turned on?
A 70% light energy, 30% thermal energy
B 70% thermal energy, 30% electrical energy
C 65% light energy, 30% thermal energy
D 40% thermal energy, 55% light energy
Answer:
Explanation:
7.Conduction
Assuming the pot is cold and the heating element is hot: Heat will be transferred from the element to the pan via conduction because they are in contact with one another.
8. C The moon
9. A heat, light and sound energy.
When fireworks explode, chemical energy is transformed into thermal energy, mechanical energy, radiant energy, and sound energy.
10.A 70% light energy, 30% thermal energy
When the flashlight is turned on, the chemical energy is first transformed into electrical energy and then into light energy.
If number 10 is not correct then the answer is C.
How would the particles be arranged in an object that has a high density? What about in
an object that has a low density?
Answer:
Explanation:
The particles in solids are very close together. They are tightly packed, giving solids high densities.
The particles in gases are very far apart, so gases have a very low density.
PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer this correctly!!!! (60pts)
Can someone tell me what all these mean in pe pls I’m confused on what they mean all of them
All electrical devices must have two of what
Answer:
a voltage source and a conductor.
Explnation:
All electric circuits have at least two parts: a voltage source and a conductor. The voltage source of the circuit
A hydraulic press consist of of two
cylinders of cross sectional areas
0.2m2 and 5m². The piston in the
smaller cylinder is pushed down
with a force of 100N through a
distance 0.2m. calculate
Links
(0)
The pressure transmitted
(ii)
The force exerted by the
piston in the larger cylinder.
Answer:
Explanation:
i )
area of small piston = 0.2 m²
Force = 100 N
pressure created on small piston
= 100 / .2 = 500 N/m²
According to Pascal's law , this pressure will be transmitted to larger cylinder .
area of larger cylinder = 5 m²
ii )
pressure = force / area
force in the large cylinder = pressure x area of large cylinder
= 500 x 5
= 2500 N .
explain the forces of that affect the soccer balls path.
Answer:
yeah its correct
Explanation:
As the ball spins, friction between the ball and air causes the air to react to the direction of spin of the ball. ... Therefore, when a soccer player kicks the ball right of center the ball spins counter-clockwise and the Magnus force acts left, causing the ball to curve left.
Name three things that are NOT made of matter
Answer:
Light.
Sound.
Heat.
Energy.
Gravity.
Explanation:
Velocity is speed with ?
To answer this question click the blank, then click the word in the word bank.
Word Bank:
A:Direction
B:slope
C:acceleration
Answer:
A. Direction
Explanation:
Velocity is the speed of something heading in a certain direction. If speed or direction changes, the velocity changes.
Acceleration occurs when an object changes its_ or _or both
Answer:
Acceleration occurs when an object changes its VELOCITY or DIRECTION or both
Explanation:
Identify what happens to the kinetic energy (KE) and gravitational potential energy (PE) of a rock as it falls.
KE and PE both increase.
KE and PE both decrease.
KE increases and PE decreases.
KE decreases and PE increases.
Answer:
KE increases and PE decreases.
Explanation:
POTENTIAL ENERGY (PE):
The potential energy of the rock depends upon the height of the rock, as given by the following formula:
P.E = mgh
Therefore, the potential energy will be highest at the initial point due to the highest height attained by rock. As the rock falls, its height will decrease as a result its potential energy will also decrease.
KINETIC ENERGY (KE):
The kinetic energy of the rock depends upon the velocity of the rock, as given by the following formula:
[tex]K.E = \frac{1}{2}mv^2[/tex]
Therefore, the kinetic energy will be zero at the initial point due to the zero velocity of the rock. As the rock falls, its velocity will increase as a result its kinetic energy will also increase.
Hence, the correct option will be:
KE increases and PE decreases.
How is speed related to kinetic energy?
Answer:
K.E. = 1/2mv^2
Explanation:
v is velocity (a vector) not speed (a scalar) but they have the same magnitude
Can someone please help me with science.
Why the temperature of a resistor increase when a current pass through it
Answer:
So, when an electrical charge passes through a resistor, some of that electrical energy is transferred into heat, increasing the temperature. This extra energy causes the particles in the resistor to vibrate more. With these particles moving more, it is more difficult to for the electrons to move through the resistor.
What is the objects average velocity?
Answer:
answer should be 10 because the line goes from (0,0) then to (1,10) and so on
What is the rate at which velocity changes called?
A 6.3 μC electric charge is placed in an Electric Field with a magnitude of 5.0 x 105 charge due to the Electric Field? N/C. What is the electric force on the charge due to the electric field
Answer:
F = 3.15 N
Explanation:
Given electric charge, q = 6.3 μC
The magnitude of electric field, [tex]E=5\times 10^5\ N/C[/tex]
We need to find the electric force on the charge due to the electric field. The electric force is given by :
F = qE
Putting all the values,
[tex]F=6.3\times 10^{-6}\times 5\times 10^5\\\\F=3.15\ N[/tex]
So, the required force on the charge is 3.15 N.