Answer:
[tex]\eta = 0.8 = 80\%[/tex]
Explanation:
Efficency of a machine is defined as the ratio of "useful" energy over the total energy imput in it. In this case a kettle wants to heat water, so thermal energy is what we need; if we wanted to build some kind of music instrument, we would be looking at the energy generating vibrations.
[tex]\eta = \frac{1200J}{1500J} = 0.8[/tex]
A Dog Is 60 m Away from while moving at a constant velocity of 10 m/s towards you.where is the dog after4 seconds?
Answer:
20 meters away from you.
What is the force of gravity on Earth in Newton's?
Answer:
9.8 meters/second^2
Explanation:
formula: Fg=mg
the speed of a wave depends on the ________.
a. crest
b.pitch
c.medium
d.amplitude
Answer:
C. Medium
Explanation:
The speed of the wave depends on the medium in which it is traveling. ... The wavelength of a wave does not affect the speed at which the wave travels. The speed of a wave is only altered by alterations in the properties of the medium through which it travels.
Hope it helps!
Một chất điểm dao động điều hòa trên trục Ox với phương trình vận tốc là
v 12 cos 4 t /6 cm / s = + ( )
. Biết rằng tại thời điểm ban đầu (t=0), chất điểm có mặt tại tọa độ 5,5 cm. Phương trình tọa độ của chất điểm là
Answer:
I think you don't understand my word because I write in English your writing in Italian
Copernicus believed the planetary motions were due to:
circular heliocentric orbits
elliptical heliocentric orbits
elliptical geocentric orbits
circular geocentric orbits
(a) circular heliocentric orbits
Copernicus's model positioned the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds.
Answer:
Copernicus's model positioned the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds.
Explanation:
Nitrogen gas reacts with hydrogen to produce ammonia. Use the chemical equation to complete the statements.
N2 + 3H2 → 2NH3
There are
nitrogen atoms on the product side.
There are
hydrogen atoms on the reactant side.
Given equation
[tex]\\ \sf\longmapsto N_2+3H_2\longrightarrow 2NH_3[/tex]
Nitrogen on product side:-
[tex]\\ \sf\longmapsto 2(1)=2[/tex]
Hydrogen on reactant side:-
[tex]\\ \sf\longmapsto 3(2)=6[/tex]
According to the question,
The Equation is
[tex] \sf \: N_2 + 3H_2 \: \longrightarrow2NH_3[/tex]
Let's balance the equation (Excluded)
[tex]\sf \longmapsto \: N_2 + 3 H_2 = 2 NH_3[/tex]
Hydrogen atoms on product side:
[tex]\sf \longmapsto2 \times 1[/tex]
[tex]\sf \longmapsto \: 2[/tex]
Nitrogen atoms on the reactant side:
[tex]\sf \longmapsto \: 3 \times 2[/tex]
[tex]\sf \longmapsto \: 6[/tex]
There fore,
Product side
[tex] \sf \: 2[/tex]
Reactant side
[tex] \sf6[/tex]
Question 9 (10 points)
✓ Saved
3
Listen
A man is whirling a 0.25 kg ball on a 1.5 m long string at 3 m/s. Find the centripetal force acting on this ball.
6
O0. 13 N
9
20. 5 N
O1.5 N
03.4 N
Answer:
C 01.5
i calculated and it was right
pls ignore the first answer
it was mistake
PLEASE ANSWER NEED HELP!!!!!!!! PLEASE THE CORRECT ANSWER!!!!!!
Hector wants to pay more attention to his diet, but he does not want to get hung up on sticking to a rigid program. Which BEST summarizes a strategy for a healthy diet?
A.
Count calories and be sure to measure every portion.
B.
Eat healthy one day and whatever you want the next.
C.
Limit sugars and fats, eat a lot of fruits and vegetables.
D.
Skip breakfast, have healthy lunch, and whatever you want for dinner.
PLEASE NO LINKS
Answer:
count calories and be sure to measure every portion
Hector wants to pay more attention to his diet, then he must count calories and be sure to measure every portion. Hence, option A is correct.
What is Diet?The food and beverages a person routinely consumes are referred to as their diet in the field of nutrition (or a group). The diet, or one that fulfills the physical needs of an individual, may be controlled during a specific therapy for a disease or management of a specific health condition.
A diabetic person's diet could be limited to a particular list of foods and beverages that can assist control blood sugar levels, for example. Numerous fiber, non-starchy fruits, and vegetables are part of the diabetes diet that is advised for patients. Rich in carbohydrates, starchy meals have the potential to raise blood sugar levels when consumed in significant quantities.
If Hector wants to pay attention to his diet and also doesn't want to get hung up on any rigid program then he must count calories and ensure that he must measure every portion.
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What is the kinetic energy of a 24 kg mass that is moving with a velocity of 3.5 m/s?
Explanation:
using kinetic energy=½MV²
m=24kg
v=3.5m/s
½×24×3.5²=147J
Can you be a teen at the age of 12
Answer:
12 is a tween (preteen) and still growing, definitely still a kid and not really a teen
Answer:
nope
Explanation:
13 thir TEEN
When nonmetals such as nitrogen and phosphorus are solids, they tend to be?
A
brittle
B
dense.
С
malleable
D
shiny
Answer:
answer is A hope this helps
Explanation:
According to the characteristics of non-metals such as nitrogen and phosphorous which are solids they are also brittle.
What are the characteristics of non-metals?Non-metals do not possess luster and are dull . They are not malleable and ductile and are soft due to the covalent bonding present in them . Non-metals on the other hand owing to their soft nature have low melting points.
Non-metals have four to seven valence electrons owing to which they usually form covalent bonds. They are poor conductors of heat and electricity and are mostly in liquid or gaseous state.They are widely used in the manufacture of fertilizers , in rocket fuels and in the form of graphite in pencil leads.
Non-metals have high ionization energies and high electronegativities.
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Radio waves and gamma rays traveling in space have the same...
Answer:
Radio waves and gamma rays traveling in space have the same speed in free space.
Hope this helps!!
Radio and Gamma rays travel with the same speed in free space.
What are Radio and Gamma waves ?"Both are electromagnetic waves. Both the waves travel with the speed 3 x 10^8 m/s in free space. Radio waves have low frequency but high wavelength. Gamma waves have very high frequency but small wavelength. Hence Radio and Gamma waves both travel with the same speed in free space."
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LA 7.0 liter balloon at room temperature (22°C) contains hydrogen gas. If the
balloon is carried outside to where the temperature is 30°C, what volume will the
balloon occupy?
Answer:
Explanation: Convert temperatures to Kelvins.
22 C = 295 K
30 C = 303 K
According to Charles' law:
V1 / T1 = V2 / T2
7 / 295 = V2 / 303
V2 = (303 * 7) / 295
V2 = 7.18983 Litres which rounds to 7.19 litres.
Magnesium Oxide Reaction
Answer:
When magnesium reacts with oxygen, it produces light bright enough to blind you temporarily. Magnesium burns so bright because the reaction releases a lot of heat. As a result of this exothermic reaction, magnesium gives two electrons to oxygen, forming powdery magnesium oxide (MgO).
Answer:
Mg+O2 -----MgO
balanced equation
2Mg+O2-------2MgO
PLEASE ANSWER NEED HELP!!!!!!!! PLEASE THE CORRECT ANSWER!!!!!!
Eduardo has always been a little self-conscious about his nose, which is quite prominent. Many members of his family have similar features, but that does not make Eduardo like it any better. What would be a body positive approach?
A.
to look into surgery to alter the shape of his nose
B.
to accept and appreciate his features for what they are
C.
to choose another part of his body to work on changing
D.
to compare himself to more successful people with different features
PLEASE NO LINKS
Answer:
I think the correct answer is B
When a marble rolls from starting point to a stopping point the type of motion is called __________ _______.
Answer: Rotational motion
Explanation: The two types of motion of the rolling ball are translational motion and rotational motion. The center of mass of the ball undergoes translational motion whereas the ball undergoes rotational motion in the center of mass frame.
Gambar berikut menunjukan lintasan sebuah proyektil yang di tembakkan dengan kecepatan horizontal v dari atas gedung setinggi h. Nilai untuk v dan h berikut yang akan menghasilkan θ terbesar adalah
Answer:
Yes
Explanation:
Thank you
9
1 point
A girl throws a football with an average velocity of 18.5 m/s a distance of 52.1 m. How long does it take the ball to cross that distance?
Time = distance / velocity
52.1 meters / 18.5 m/s = 2.82 secondsT
Francesca and Maricruz are walking to Kroger to buy some juice. They walk 3000 meters in 900 seconds. What was their average speed in km/h?
Answer:
3000m in 900 s
which means 1km/1hour=1000m/3600s=5/18
3000/900*5/18
1.6kmph
Explanation:
CAN I GET BRAINLIEST
What type of energy transformation is demonstrated in the above diagram?
A. heat energy to light energy
B. solar energy to heat energy
C. chemical energy to heat energy
D. heat energy to electrical energy
Answer:
C :)
Explanation:
Trust me
Energy transformation is demonstrated in the diagram is solar energy to heat energy.
What is energy?Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.
Solar radiation is absorbed at the surface of a receiver, which includes oris in touch with flow passageways through which a working fluid moves, during thermal conversion operations. Heat is delivered from the heating receiver to the working fluid, which might be air, water, oil, or molten salt.
Energy transformation is demonstrated in the diagram is solar energy to heat energy.
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near earth's surface is the weight of an object in newtons about 10 times it's mass in kilograms?
Answer:
Weight varies with location depending upon the acceleration due to gravity eg. for a mass m = 10kg on Earth it`s weight is W = mg = 10 x 10 = 100N.
Explanation:
Near Earth's surface, the weight of an object in newtons is 10 times its mass in kilograms. This relationship of the acceleration is due to gravity on Earth, which is 9.81 m/s².
Mathematically, it can be expressed as:
Weight (in newtons) = Mass (in kilograms) × Acceleration due to gravity
So, an object with a mass of, for example, 5 kg, its weight near the Earth's surface would be:
Weight = 5 kg × 9.81 m/s² = 49.05 N
The weight in newtons is roughly 10 times the mass in kilograms of objects near the Earth's surface. The given statement is correct.
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Does photosynthesis absorb or release energy
it absorbs energy and releases oxygen and glucose.
The student applies a force of 40 N to 20 kg box Assume there is negligible friction between the box and the floor. Calculate the magnitude of the box’s acceleration.
Answer:
cant be calculated since there is no direction and magnitude needs direction
Explanation:
please help ! Which of the following objects has the greatest momentum?
Answer:
An object with a mass of 0.5 kg and a velocity of 3 m/s
Explanation:
Momentum = mass * velocity
= 0.5 * 3
= 1.5
Highest value among all.
Hope it helps!!
Suppose two equal mass cars traveling with equal speeds in opposite directions inelasticcollide head on and stick together. What fraction of the energy is dissipated
A collision which is inelastic is one in which the internal energy changes.
All the kinetic energy is dissipated
Reasons:
The given parameters are;
The mass of one car = The mass of the second car in the collision = m
The type of collision = Inelastic collision
The speed of each of the cars in the collision = v and -v
Solution:
In an inelastic collision, we have;
[tex]m_1 \cdot v_{1i} + m_2 \cdot v_{2i} = (m_1 + m_2) \cdot v_f[/tex]
Therefore, we get;
[tex]m \cdot v_{i} -m \cdot v_{i} = 0= 2 \cdot m \cdot v_f[/tex]
Which gives;
[tex]v_f = 0[/tex]
The collision is an example of a perfectly inelastic collision, and the final velocity after the collision is zero.
The change in the energy is [tex]\Delta K.E. = K.E._{final} - K.E._{initial}[/tex]
[tex]K.E._{initial}[/tex] = 0.5·m·v² + 0.5·m·v² = m·v²
ΔK.E. = 0.5·(2·m)×0 - 0.5·m·v² + 0.5·m·v² = -m·v²
ΔK.E. = -m·v²
The negative sign stands for energy given out, which gives;
The energy dissipated = m·v² (The total initial kinetic energy)
Therefore, all the kinetic energy is dissipated
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You walk 2 minutes at 2 m/s and then 5 minutes at 1 m/s what is your average speed
5 mins
Explanation:
because speed ÷ to distance since the distance is 5 miles the answer is 5mins if not it's 0.2 if the teacher incorrect it
what can electromagnetic waves travel through that mechanical waves can not travel through?
Answer:
I believe it is vacuum of space
Explanation:
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
when light passes through an ordinary window pane, its angle of emergence is
when light passes through an ordinary window pane, its angle of emergence is the same as its angle of incidence light refracts when traveling from air into glass because light travels slower in glass then in air
Light speeds up and changes direction when it passes through water or glass at an angle and enters the atmosphere. Turning away from the usual line, the light. Imagine a tractor transitioning from a slow-moving, muddy, grassy area to a quick-moving road.
What light passes through an ordinary window pane?Light refracts while passing from air into glass because light travels more slowly in glass than it does in air. When light passes through a typical window pane, its angle of emergence and angle of incidence are the same.
When light travels from the less dense air into the denser glass or water, what actually happens is that it slows down. The light ray also changes direction as a result of this slowing down. Refraction is brought on by a change in the speed of the light.
Therefore, When light rays bounce off a surface, transition from one transparent medium to another, or proceed through a medium whose composition is constantly changing, they change direction.
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L4 M-9 T-6 J9 . L-2 M-6 T-3 J-3
???
A force of 50N acts in an easterly direction on an object at the same time as a force of 80N pushes on it in the direction of N 45 degrees E. Determine the magnitude and direction of resultant force
Answer:
Refer to the MS Word Document page to get explanation and answers.
