Explanation:
chemical changes
>produce new substances w/ different chemical structure/ properties
> thermal energy can be used to BREAK bonds (endothermic)
>thermal energy can be transferred to a chem rxn to help form new products (endothermic)
> heat can be released by an exothermic chemical reaction (excess energy- the total energy used to break bonds is less than energy released in forming new bonds)
physical changes
>does not result in new substances (typically changes in state- solid, liquid, gas)
> thermal energy can be transferred to EVAPORATE water (add thermal E... water (liquid) to steam (gas)) or FREEZE water (remove thermal E... water (liquid) to ice (solid))
calculate the depth of ocean if ultrasonic pulses produced are received after 9 seconds. ( speed of sound in water = 1498m/s )
Answer:
13482m÷2
Explanation:
1498m÷s×9=13482m÷s
The depth of the ocean if the ultrasonic pulses produced are received after 9 seconds will be equal to, 6741 m.
What is Sound?Sound is a mechanical disruption from an equilibrium position that travels through an elastic medium of material.
It is also possible to define sound solely subjectively, as that which is regarded by the ear, but this definition lacks clarity and is overly constrictive because it is useful to talk about sounds that are manufactured by devices other than the human ear, such as dog whistles and sonar machinery, which cannot do hear by human ear.
The features of sound waves must be examined first in any study of sound. Transverse and longitudinal waves are indeed the two fundamental forms of waves, and they vary by the direction in which they move.
As per the given information in the question,
Let the depth is d.
Total distance the pulse has to travel = 2d
Time taken, t = 9 sec
Speed of sound, V = 1498 m/s
Velocity = Distance/time taken
V = 2d/9
d = 1498 × 4.5
d = 6741 m.
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What is the equivalent resistance of the circuit?
Resistors & Notations In Series In Parallel
A, B A + B A | B
A, B, C, D A+B+C+D A | B | C | D
In Combination Example A | B | ( C + D ) A | B | ( C + D )
Dec 1 2020
An object is moving across a surface, but it is not gain or lose speed. Which best describes the objects force?
Answer:
Gravity. An object is moving across a surface, but it does not gain or lose speed.
Explanation:
The basic idea. Physicists see gravity as one of the four fundamental forces that govern the universe, alongside electromagnetism and the strong and weak nuclear forces.
Hope it helps! Brainliest?
A 6.0 kg object is pushed with a force of 12 N. If the mass of the object is cut in half to 3.0 kg, what happens to the acceleration if the force remains constant?
Answer:
aceleration doubles
Explanation:
From Newton's secon law, one has
F=m*a
where F is the force, m the mass and a the aceleration.
In general, if m becomes m/2, in order to have the same force,
the acceleration must be doubled:
[tex]F=m*a=\frac{m}{2} (2*a)[/tex]
In our particular case,
[tex]12=6*a=\frac{6}{2} (2*a)\\12=3(2*a)[/tex]
White light can be separated into SIX main colors (although colors are continuously blended). List these SIX colors from MOST energetic to least energetic.
Answer:
Violet, blue, green, yellow, orange, red
Explanation:
I just took the astronomy quiz, I got it right
why do we use mercury in thermometer
Answer:
Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. It also has a high boiling point which makes it very suitable to measure higher temperatures. Also, it has a shiny appearance and doesn't stick to the glass surface of glass.
Explanation:
If you see a dark mass similar to a blown-up balloon at the top of a volcano, what type of feature are you most likely viewing?
a lava dome
a flood basalt plateau
a geyser
a newly formed island
Sorry I marked it as physics, because it should be science but there isn't a subject for that :(
Answer:
Lava dome
Explanation:
A geyser is hot water being shot up from the ground
A newly formed island would be somewhere on the ground not directly above a volcano (Well depending on where the volcano is anyways)
A flood basalt plateau is like rocks I think?
A dog has a mass of69kg and an acceleration of 2m/s/s. What is the force of the dog?
Answer:
138 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 69 × 2
We have the final answer as
138 NHope this helps you
Technology has increased the success of the medical field. Which examples of technology have had a great impact on the medical field?
Answer:
what do you need helo with
Thank you if you them
Answer:
Explanation:
3. The word circuit means "go around", therefore a circuit is a pathway or closed path around which electricity (or water) flows.
4. Electrons flowing through a wire can be compared to water flowing through a hose. Once the flow of electrons or water is going, work, is performed.
5. You would get shocked in a bumper car by touching the floor and the ceiling at the same time. This means you are completing the circuit allowing electricity to flow.
6. Electricity from a wall outlet has enough energy to stop your heart.
7. Electricity is the flow of electrons, because electrons move or jump from atom to atom.
8. Materials that allow electrons to move easily from atom to atom are called conductors.
9. Materials that do not allow electrons to flow easily are called insulators.
10. Semi- conductors are materials that are somewhere in between .
11. Voltage is the force or pressure of electricity and is compared to the amount of water pressure in a hose.
12. Current (amps ) is the amount of electricity and is compared to the amount of water in a hose .
13. Watts (power) is the term for work performed by electricity.
1. Which has more momentum: a bowling ball with a velocity of 7.0 m/s or a basketball with a
velocity of 9.0 m/s? The bowling ball has a mass of 5.5 kg (roughly a 12-pound bowling ball),
and the basketball has a mass of 6.2 x 10 kg.
bowling ball:
basketball:
Answer:
kenitec energy
Explanation:
because kinetic and mass have same
first answer will be made brainliest
Using the graph from part (c) calculate the spring constant of the spring that the student
used.
Give your answer in newtons per metre
the image shows the information that was on the graph
Answer:
1.75 is the unit rate so yeah
state two reasons why the rod is not in equilibrium
Answer:
For equilibrium the net torque on the rod must be zero. So the 100N forces should on either side of the pivot point i.e. one on the left and one the right, and in same direction.
Given a force of 100 N and an acceleration of 5 m/s2, what is the mass
Answer:
20 kg
Explanation:
Mass equals force divided by acceleration, so divide 100 N by 5 m/s2 and you get your mass: 20 kg
Answer: m= 20 kg
Explanation: Use the formula
F = m a
to solve this.
100 N = m (5 m/s²)
100 N / (5 m/s²) = m
20 kg = m
(N is also kgm/s², so when you divide by m/s², you are left with kg.)
What does rain look like?
Answer:
is about something failing down
it is a water
Explanation:
it falls after the clouds are full from either evaporation or transportation in the water cycle but do not drink it, it is very dirty and bad for you
If a 25 kg object is moving at a velocity of 10 m/s, the object has
energy. Calculate it.
Answer: Your answer is 1250J
Explanation:
K E = 1/2 m v 2
The mass is
m = 25 k g
The velocity is v = 10 m s − 1
So,
K E = 1 /2 x25 x 10 2^2= 1250 J
pls mark brainiest answer
What is the difference in KE between a 52.5 kg person running 3.50 m/s and a 0.0200 kg bullet flying 450 m/s?
(Unit = J)
Answer:
Ek = 1705.28 [J]
Explanation:
In order to solve this problem, we must remember that kinetic energy can be calculated by means of the following equation.
[tex]E_{k}=\frac{1}{2} *m*v^{2}[/tex]
where:
m = mass [kg]
v = velocity [m/s]
Ek = kinetic energy [J] (Units of Joules)
For the person running
[tex]E_{k} =\frac{1}{2}*52.2*(3.5)^{2} \\ E_{k} =319.72[J][/tex]
For the bullet
[tex]E_{k} =\frac{1}{2} *m*v^{2}[/tex]
[tex]E_{k} =\frac{1}{2} *0.02*(450)^{2} \\E_{k}=2025 [J][/tex]
The difference in Kinetic energy is equal to:
Ek = 2025 - 319.72
Ek = 1705.28 [J]
Answer: 1703.44
Explanation: trust
Answer and I will give brainiest!!!! How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2? 0.013 N 75 N 108 N 1080 N
Answer: the answer is 108 N
Just took the test and got 108 N correct
Solve this system of equations without graphing and show your reasoning
5x+y=7
20x+2=y
Answer:
Explanation:
5x + y = 7
20x - y = -2
25x = 5
x = (1/5)
5(1/5) + y = 7
1 + y = 7 .
y = 6
system of equations 5x+y=7, 20x+2=y
is [tex]x=\frac{1}{5} \\y=6[/tex]
What is system of equations?Orsimultaneous equations, system of equations Two or more equations to be solved in algebra together (i.e., the solution must satisfy all the equations in the system). To have a unique solution, the number of equations must equal the number of unknowns. A set of simultaneous equations is a finite set of equations for which common solutions are sought. It is also referred to as an equation system or a system of equations. Systems of equations are used to solve applications when there are multiple unknowns and enough information to set up equations in those unknowns. In general, we need enough information to set up n equations in n unknowns if there are n unknowns.Therefore,
Calculation
[tex]5x+y=7.............(i)\\20x+2=y..........(ii)[/tex]
adding equations (i) and (ii)
⇒[tex]5x+y=7-(20x-y=-2)[/tex]
⇒[tex]25x=5[/tex]
⇒[tex]x=\frac{1}{5}[/tex]
putting the value of x in equation (i), we get
⇒[tex]5[/tex]×[tex]\frac{1}{5}+y=7[/tex]
⇒[tex]y=7-1[/tex]
⇒[tex]y=6[/tex]
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What is technology?
А. the ability to perform a task in a short period of time using little to no energy.
B. the ability to perform a task using a full range of motion in a short period of time.
C. the production of new machines as a result of processes using science and knowledge.
D. the interaction among people, companies, and governments of different nations
Answer:
C. the production of new machines as a result of processes using science and knowledge.
Explanation:
Technology is the application of scientific research and knowledge .
Helpp pls, with explanation
Answer:
B .
Explanation:
Elastic potential energy stored in a spring is given by;
E=1/2*k*{Δl}² where
k= spring constant
Δl = change is length of spring
if k is different the energy stored in the system is different. This is true also in the case where Δl is different.
For a parallel system, springs help each other to carry the weight. The stiffness doubles up to mean ;
k parallel =2k
and
Δl parallel = 1/2 Δl
so;
E in one spring = 1/2*k*{Δl}²----------{a}
Using {a} this in the parallel system;
E parallel = 1/2 * 2k * {1/2Δl}²
= 1/2 * 2* k* 1/4 *{Δl}²
= 1/2 E in one spring
Answer : Ep / 2
HUUUUURRRRRYYYYY
Latent heat of fusion refers to which changes of state?
liquid to solid or solid to gas
solid to gas or gas to liquid
solid to liquid or liquid to solid
gas to liquid or liquid to gas
Answer:
solid to gas or gas to liquid
Explanation:
welcome
Answer:
solid to gas or gas to liquid
Explanation:
Edge
what type of nuclear energy is used for a nuclear reactor power plant
Answer:
Nuclear fission creates heat!!
Explanation:
Reactors use uranium for nuclear fuel. The uranium is processed into small ceramic pellets and stacked together into sealed metal tubes called fuel rods. Typically more than 200 of these rods are bundled together to form a fuel assembly!
P.S. You can search this up!
- Hope this helped you!! :D
Choose the answer to fill in the blank, which best completes the sentence.
Choice of medium allows the artist to ________________
a.
convey different messages.
b.
experiment with combining materials to create new media.
c.
reconnect with old forms of art.
d.
improve realism in art, particularly with portraits.
Answer:
A on edge 2020
Explanation:
Answer:
a. convey different messages.
Explanation:
Got it on edge just took the test.
An object is moving across a surface, but it does not gain or lose speed. Which best describes the object’s force?
The net force is positive.
The net force is zero.
The positive force is greater than the negative force.
The negative force is greater than the positive force.
Answer:
An object is moving across a surface, but it does not gain or lose speed, the object's net force is zero.
Explanation: The net force means the vector sum of all the forces acting on an object
Answer:
well its not C
Explanation:
Two pieces of evidence for plate tectonics?
Explanation:
fossil and glaciers is the to pieces of evidence
HELP!!
You walk 130 m E and then turn and walk another 43m [E 28 degree S] what is the total displacement?
Answer:
Total displacement 155 m
Explanation:
From the question, the formula to apply will be that of cosine rule where:
[tex]c=\sqrt{a^2+b^2-2ab*cosC}[/tex]
where
a= 43 m , b=130m and c =? , <C=28° + 90° =118°
Substituting values in the equation as;
[tex]c=\sqrt{43^2+130^2-2*43*130*cos118}[/tex]
[tex]c=\sqrt{1849+16900-11180*-0.46947} \\\\c=\sqrt{1849+16900+5249} \\\\c=\sqrt{23998} \\\\\\c=155m[/tex]
Most persons are of the belief that the old time hard or solid iron cars are much safer in collisions than the new model softer cars. But how can newer, softer cars be safer in a collision, considering momentum?
If someone wanted to analyze a set of tree rings but didn't know when the tree lived, how could they find out?
1.Use carbon-14 dating methods on the organic wood sample.
2.By which analyzing which historic layer of rock or dirt the tree was found in.
3.Find a tree that matched the ring pattern.
4.Estimate how old the tree was by the condition of the wood.
Answer:
number one use carbon 14
Explanation:
Answer:
A
Explanation:
Carbon-14 testing of organic material such as wood can approximate the age by measuring the radioactive decay rate of the carbon-14 in the wood. From that a baseline for the trees age can be established and the ring patterns can by applied to a time period.
MORE POINTS, BRAINLIEST!!!
Explain what an electrical current is, and describe the parts of a circuit.
Answer: An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space.
Explanation: The parts of a circut bit can easily be found online, but heres a pic i found.