Answer:398.5 watts
Explanation:
Which represents an endothermic reaction? wood burning in a fire splitting a gas molecule using a heat pack on an injury TNT exploding
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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4. Un móvil lleva una velocidad de 75 m/s, en dicho momento aplica los frenos durante tiempo de 15 segundos hasta detenerse. ¿cuál será la aceleración del frenado? ¿cuál es la distancia que recorre hasta detenerse?
Answer:
a = 5 m / s² and x = 562.5 m
Explanation:
Let's apply the kinematics relations
v = v₀ + at
v² = v₀² + 2a x
In this case, as the car stops, its final speed is zero (v = 0) and the acceleration must be opposite to the speed, that is, negative
0 = v₀ - a t
a = v₀ / t
let's calculate
a = 75/15
a = 5 m / s²
let's look for the distance
0 = v₀² - 2a x
x = v₀² / 2a
let's calculate
x = [tex]\frac{75^2}{2 \ 5 }[/tex]
x = 562.5 m
Which quantity is measured in newton seconds (Ns)?
impulse
moment
power
work done
Answer:
Impulse
Explanation:
Impulse is force times time
What is the dominant season in the low latitude belts? Question 6 options: Fall Spring Summer Winter
Answer:
dominant season is SUMMER
Explanation:
Latitude on the planet is the angle measurement from the so-called equator or midpoint of the Earth's sphere, therefore latitude values can range from 0º to 90º.
Low latitude values, values close to zero degrees, are very close to the central part of the planet, so when you plan to tilt in or orbit the Sun, this part is almost fixed, therefore the solar irradiation is very constant. throughout the year, consequently the dominant season is SUMMER
Do you believe that there should be no age limit in ballroom dancing?
Answer:
There should be a certain age limit Idon't know
Explanation:
Which carries information by copying an original sound?
O analog signal
O digital signal
O volume
O frequency
Answer:
A. Analog signal
Explanation:
:)
A trombone acts as if it were an
open pipe of length 2.96 m. What
is the frequency of its fourth
harmonic?
(Speed of sound
343 m/s)
(Unit = Hz)
Answer:231.756757
Explanation:
(4)(343/2.96(2)= 231.756757
Answer:
The answer is 231.757 trust
Explanation:
star
A person runs 2 laps around a 400 meter track and stops where they initially
began running. It took this person 3 minutes and 18 seconds to complete this
run. What is this persons average velocity?
A:4.04 m/s
B:2.02 m/s
c:0 m/s
The runner's total distance covered was 800 meters. Her displacement (straight-line distance between start-point and end-point) was zero.
Her average speed = (distance)/(time) = 4.04 m/s
Her average velocity = (displacement) / (time) = zero (choice - c)
Si lo deseas cada estudiante puede hablar algún otro aspecto de la pandemia que les parezca importante e interesante
Answer:
Give them assignment on the pandemic.
Explanation:
If you wish, each student can talk about some other aspect of the pandemic that seems important and interesting then you have to give them the assignment of presentation and give reward on them. The students will definitely make the presentation on other aspects of the pandemic and when they present it in the class it enhance the knowledge of other students as well.
the brain can retain the impression of the image of an object for 1/20of a second even when the image is no longer in front of the eyes .
plz tell me whether it is true or false
I need help please hurry ??!!!
Answer:
I would use the model of Ammonia because it helps you visualize the structure of NH3 better than the description. It would be easier to understand the structure of it if you can see it, rather than reading its description.
Assume ω = 47.0 rad/s . What is the magnitude v of the velocity of the particle in m/s?
That completely depends on the radius of the particle's path.
That is, the radius of the wheel the particle is riding on, and exactly where on the wheel the particle is riding.
This information is not included in the question, so no answer is possible.
A woman runs 4.5 miles south and 3,7 miles east. What is the angle of the displacement of the resultant?
Answer:
51°
Explanation:
Please see attached photo for explanation.
In the diagram, R is the resultant and θ is the angle of the displacement of the resultant.
The value of θ can be obtained as follow:
Angle θ =?
Opposite = 4.5 miles
Adjacent = 3.7 miles
Using Tan ratio:
Tan θ = Opposite / Adjacent
Tan θ = 4.5 / 3.7
Tan θ = 1.2162
Take the inverse of Tan
θ = Tan¯¹ 1.2162
θ ≈ 51°
Thus, the angle of the displacement of the resultant is 51°
which of the following is not good conductor of electricity
Answer:
Plastic is not a good conductor of electricity.
Explanation:
Hope it helps!
If you dont mind can you please mark me as brainlest?
What causes a snowflake to melt on your tongue?
Answer:
thermal energy
Explanation:
heat transfers into it causing it to physically change
Answer:
A pesar de las diferencias entre cada copo de nieve y las grandes familias de copos que existen, estos todavía tienen una base hexagonal. Esta estructura hexagonal se explica por la forma en que las moléculas de agua se unen para formar un cristal
Despite the differences between each snowflake and the large families of flakes that exist, they still have a hexagonal base. This hexagonal structure is explained by the way in which water molecules come together to form a crystal.
Explanation:
mn
The hairdryer has a plastic case so there is no need for an earth wire connection in the plug.
Explain why the hairdryer is still safe to use.
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
Ice is made of water so why does it float?
Answer:Its a Soild
Explanation:
1. What physical benefits can a person gain from playing floor hockey?
Answer:
strengthens ur muscles
What property of a wave increases as the wave's energy increases?
frequency
pitch
trough
amplitude
Answer:
Frequency.
Explanation:
More energy = shorter wavelength = greater frequency
what are the comparisons and contrast of adaptation and natural selection? ASAP!!!!!!
Answer:
Natural selection is a mechanism, or cause, of evolution.
Explanation:
Adaptations are physical or behavioral traits that make an organism better suited to its environment. Heritable variation comes from random mutations.
help help help help help
Answer:
It is cold at saturn and far away
Explanation:
Explain why you can see a phone underneath a glass bell jar, but you cannot hear
it when it is ringing?
Answer: Any sound cannot be heard through a glass bell jar because a vacuum is created in the jar and sound cannot travel without a medium like gases, solids or liquids
Answer:
the glass hids it and the vibration of the phone is the way you hear it
Light can make things happen when it is ______. Fill in the missing word. COrrect answer gets brainliest!
Answer:
Light can make things happen when it is shining.
(or glowing)
Calcular la aceleración que produce una fuerza de 40 N sobre un cuerpo con 88 Kg de masa. Expresar el resultado en m⁄s^2 *
Answer:
a = 0.45 m/s²
Explanation:
The given question is ''Calculate the acceleration that produces a force of 40 N on a body with 88 kg of mass".
Given that,
Force, F = 40 N
Mass of the body, m = 88 kg
The net force acting on the body is given by :
F = ma
Where
a is the acceleration of the body
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{40\ N}{88\ kg}\\\\a=0.45\ m/s^2[/tex]
So, the required acceleration is 0.45 m/s².
tips for achieving good grades at science exam? i would be very thankful for you!!
Un cuerpo de 480 g de masa es atraído con una fuerza de 3.9 E-6 N por otro cuerpo de 196 g de masa. Calcula la distancia a la que se encuentran.
Answer:
La distancia entre los dos cuerpos es aproximadamente 1.269 milímetros.
Explanation:
Asumamos que ambos cuerpos son partículas, la fuerza de atracción ([tex]F[/tex]), en newtons, entre ambos cuerpos se define mediante la Ley de Newton de la Gravitación Universal, cuya ecuación es:
[tex]F = G \cdot \frac{m_{1}\cdot m_{2}}{r^{2}}[/tex] (1)
Donde:
[tex]G[/tex] - Constante de la gravitación universal, en metros cúbicos por kilogramo-segundo cuadrado.
[tex]m_{1}, m_{2}[/tex] - Masas de los cuerpos, en kilogramos.
[tex]r[/tex] - Distancia entre los cuerpos, en metros.
Si sabemos que [tex]G = 6.674\times 10^{-11}\,\frac{m^{3}}{kg\cdot s^{2}}[/tex], [tex]m_{1} = 0.48\,kg[/tex], [tex]m_{2} = 0.196\,kg[/tex] y [tex]F = 3.9\times 10^{-6}\,N[/tex], entonces la distancia entre los dos cuerpos es:
[tex]r = \sqrt{\frac{G\cdot m_{1}\cdot m_{2}}{F} }[/tex]
[tex]r \approx 1.269\times 10^{-3}\,m[/tex]
Es decir, la distancia entre los dos cuerpos es aproximadamente 1.269 milímetros.
Q. Why do molecules of an object moving faster when dropped to the ground?
(can you give a good example, if you aren't able to explain in words).
spam & you'll be reported
Answer:
the cause of variation gravity
Answer:
Heavier Objects Don't Hit the Ground First
A tea kettle is used to boil liquid water. When the water is boiling, a whistling sound comes from the kettle. Which provides the best explanation for the sound?
A. The liquid particles are sliding past each other slowly as the temperature increases
B. The gas particles are being pushed below the water at the bottom of the kettle.
C. The gas particles spreading out in all directions are being pushed quickly through a small opening.
D. The liquid particles are moving very quickly to the center of the kettle and pushing any gas particles out of the way.
Answer:
C would be the correct answer
Answer:
It has to have a whistle device on the spout. When boiling occurs, water vapour displaces air above the water which has to escape through the whistle hence activating the required vibrations. Thereafter, the continuing supply of steam does the same job until the cook involves turns off the heat. The whistle is not made to exacting scientific standards and there is no doubt a range of pressures above which it will work it. It would be interesting to know how you observed the water boiling without using a transparent kettle.
Explanation:
hope it helps
What is the wave speed of a 6 m wave with a frequency of 20 Hz?
Answer: Wave speed= frequency x wavelength
=20 x 3
=60 m/s
Explanation: