Answer: There are 9 molecules.
Explanation: 3H2O has 6 hydrogen atoms and 3 oxygen atoms. Heres a diagram.
HHO + HHO + HHO = 3H2O
what are the standard units of displacement?
Mr. White drops a bowling ball and a feather from the top of the Washington Monument.
a) Which will hit the ground first? Why?
b) If Mr. White were to repeat this experiment inside a vacuum chamber, which would hit the ground first? Why?
If you can provide some explanation I would greatly appreciate it! :)
Answer:
A) The bowling ball will hit the ground first. It is heavier, which has greater density, allowing it to reach the ground first.
B) Feather. If you want to be able to blow a bowling ball in a vaccum cleaner, it's almost impossible since it's very heavy. If it's a feather, it would be easier as it's light and the air inside it is able to force it down.
Note: I haven't learnt physics at all yet, this is just an attempt. I'm in 7th grade currently and I will probably be taking physics sometime in 9th grade.
A car drives in a circle at 56 km/hr. Which of
the following accurately describes the
motion of the car? The car's -
speed and velocity are both constant.
velocity is constant but speed is changing.
speed is constant but velocity is changing.
speed and velocity are both changing.
Answer:
Speed is constant but velocity is changing
Explanation:
Speed is a scalar quantity, meaning magnitude only. Velocity is a vector quantity, meaning magnitude and direction. If you're moving in a circle at a constant speed, the speed is constant but the direction is constantly changing. Therefore, the speed is constant but velocity changes.
Complete the following statements for each of these rules
a (?)×(-)=(+)
b (?)×(-)=(×)
c (-)÷(-)=(?)
d (-)×(?)=(-)
e(+)÷(-)=(?)
f(+)÷(+)=?
g(?)÷(+)=(-)
h(-)3=?
i (+)3=?
j(-)2=?
l(+)2=2
Answer:
i dont know
Explanation:
Can any one here form light from lemon?
Answer:
I did not get it
Explanation:
what u r saying
Find the following answer based on the image.
We are given:
Mass of Neptune = 1.03 * 10²⁶ kg
Distance from the center of Neptune (r) = 2.27 * 10⁷
now, computing the value of the acceleration due to gravity (g)
Finding g:
We know the formula:
g = G(mass of planet) / (r)²
g = [6.67 * 10⁻¹¹ * 1.03*10²⁶] / (2.27*10⁷) [since G is 6.67*10⁻¹¹]
g = (6.87 * 10¹⁵) / (5.15 * 10¹⁴)
which can be rewritten as:
g = (6.87 * 10¹⁵ * 10⁻¹⁴) / 5.15
g = (6.87 * 10¹⁵⁻¹⁴) / 5.15
g = (6.87/5.15) * 10
g = 1.34 * 10
g = 13.4 m/s² (approx)
Some one plz help me and I will give you brainliest plz
An endothermic reaction is one in which heat is transferred from the surroundings to the reactants.
Please select the best answer from the choices provided
T
F
Answer:
An endothermic reaction is one in which heat is transferred from the surroundings to the reactants.------- true
Answer:
T . Energy is transferred to the reactants
Explanation:
An object is placed 1.0 cm from a convex mirror with a focal length of 4.0 cm.
Answer:
image distanc=-0.8cm
Explanation:
.8 is the answer, sorry I do not have the proof.
But the other guy DOES NOT know how to write.
Which is NOT considered as a property of electromagnetic waves: 5
- Travels at speed of 3 x 10^8 m/s
- Transverse wave
- Transfer energy /information
- Require a medium to propogate
Answer:
require a medium to propagate
Explanation:
this is because electromagnetic waves can travel through vacuum at the speed of 3.0 x 10^8 m/s
because they don't need particles to transfer energy
hope this helps
what is refractive index ?
Explanation:
Refractive Index is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater density. The refractive index variable is most commonly symbolized by the letter ‘n’ or n’ in a descriptive text and mathematical equations.
A force of 900 N pushes a wedge 0.10 m into a log. If the work done on the log is 50 J, what is the efficiency of the wedge?
Answer:
I'm fairly certain it's 1,800
Explanation:
The efficiency of the wedge with force F=900 N displaces the wedge 0.10 m is 55.55% or 56%.
What is the efficiency of the machine?The efficiency of the machine equals the ratio of output energy and input energy. It is also defined as the ratio of work done on a load by the machine to the work done on the effort by the machine.
A load is defined as the weight lifted by the machine. The effort is defined as the force applied to bring the desired change in the load. Work done is defined as the product of force and displacement.
The efficiency, η = Output power / Input power, and the highest efficiency of the machine is equal to one. The efficiency of the machine has no unit. The efficiency η = (Actual work done / Ideal work done) × 100.
From the given,
Force = 900 N
Displacement = 0.1 m
Work done = F × s = 900×0.1 = 90 J
Actual work done = 50 J
Efficiency,η = (50/90) × 100
η = 55.55 %
Thus, the efficiency of the wedge is 55.56%.
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Plz help me plzzz. I'm begging you
Answer:
a then c then b
Explanation:
Science: Work, Power and Efficiency Practice Problems:
Work = Force x Distance
Power = Work / Time
Percent Efficiency = Work
Output/Work Input x 100
Step 1: Write the equation
Step 2: Substitute with units
Step 3: Solve with units
rounding to the nearest tenth
1) It took 639 Newtons to push a table 21 meters. How much work was done?
Answer:
I believe it is 13,419 joules.
Explanation:
I could be very wrong, please fact check me
By applying the principle of moments, find the value of F2
Answer:
bla bla bla
Explanation:
it will give the people who answer the points or brainliest!
Please help!!!
What do all of the inventors discussed in this lesson have in common?
All of the inventors can be characterized as problem-solvers.
O All of the inventors created new things as children.
All of the inventors used engineering principles to create new things.
O All of the inventors needed mathematics principles to formulate solutions.
Answer:
All of the inventors can be characterized as problem-solvers.
Explanation:
Took the practice
Answer:
All of the inventors can be characterized as problem-solvers.
Explanation:
Describe a way that gravity influenced the formation of the solar system, with the planets orbiting the sun.
Gravity influenced the formation of the solar system, with the planets orbiting the sun.
What is Gravitational Force ?Gravitational force is force of attraction between two masses. Gravitational force(F) between two bodies is directly proportion to the product of masses(m₁,m₂) of two bodies and inversely proportional to square of distance(r) between them. mathematically it is written as,
F [tex]\alpha[/tex] m₁.m₂
F [tex]\alpha[/tex] 1/r²
F = G m₁,m₂÷r²
where G is gravitational constant, whose value is 6.6743 × 10⁻¹¹ m³ kg-1s⁻².
Force is expressed in Newton N in SI unit. its dimensions are [M¹L¹T⁻²].
According to Kepler's first law of motion, every planet is moving in an elliptical orbit with sun has situated at one of the foci of the orbit.
when a planet moves in the orbit around the sun, it moves in a stable orbit. in this orbit , centripetal force is equal to centrifugal force, in this case centripetal force appears as gravitational force. Means Gravitational force between sun and planet balances the centrifugal force which is outwards. In such a way gravity influenced the formation of the solar system.
Hence gravity plays crucial role in the formation of solar system.
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What unit of time on Earth is based on the revolution of the Earth around the Sun?
A.
day
B.
hour
C.
year
D.
month
C.) Year
i hope this helped! please mark me as brainliest and 5 stars >:)
Answer:
I believe it's C. Year.
Explanation:
Hope this helps! ^^
How are reversibility, time, and entropy connected
Answer:
As one goes "forward" in time, the second law of thermodynamics says, the entropy of an isolated system can increase, but not decrease. ... Thus, entropy measurement is a way of distinguishing the past from the future.
Explanation:
A projectile is shot horizontally from the edge of a cliff, 400 m above the ground. The projectile is traveling horizontally at 65 m/s the moment it leaves the cannon.
What is the initial vertical velocity of the projectile?
Determine the time taken by the projectile to hit the ground.
How far does the projectile land from the base of cliff?
Find the vertical component of the velocity just before the projectile hits the ground.
What is the magnitude of the final vector velocity the instant before it hits the ground?
What is the direction of the final vector velocity the instant before it hits the ground?
Answer:
a) [tex]v_{oy}[/tex] = 0, b) t = 9.035 s, c) x = 587.275 m, d) v_y = -88.54 m / s,
e) v = 109.84 m / s, f) θ = -53.7º
Explanation:
This exercise is a projectile launch
a) as the projectile is launched horizontally, its initial vertical velocity is zero
[tex]v_{oy}[/tex] = 0
b) let's use the relation
y = y₀ + v_{oy} t - ½ g t²
when reaching the ground y = 0 and the initial vertical velocity is v_{oy}=0
0 = y₀ + 0 - ½ g t²
t = [tex]\sqrt{ \frac{2 v_o}{g} }[/tex]
t = [tex]\sqrt{ \frac{ 2 \ 400 }{ 9.8} }[/tex]
t = 9.035 s
c) the horizontal distance is
x = v₀ₓ t
x = 65 9.035
x = 587.275 m
d) the vertical speed when touching the ground
v_y = [tex]v_{oy}[/tex] -gt
v_y = 0 - 9.8 9.035
v_y = -88.54 m / s
the negative sign indicates that the velocity is directed downwards
e) the velocity at this point
v = [tex]\sqrt{ v_x^2 + v_y^2}[/tex]
v = [tex]\sqrt{65^2 + 88.54^2}[/tex]
v = 109.84 m / s
f) the direction of the velocity
let's use trigonometry
tan θ = v_y / vₓ
θ = tan⁻¹1 v_y / vₓ
θ = tan⁻¹ (-88.54 / 65)
θ = -53.7º
this angle is measured clockwise
The three main types of nuclear radiation are alpha, beta, and gamma
Which of the following lists these types of radiation from highest penetrating power to lowest penetrating power?
beta, alpha, gamma
beta, gamma, alpha
ОООО
O gamma, beta, alpha
O alpha, gamma, beta
The correct order of these types of radiation from highest penetrating power to lowest penetrating power is gamma, beta, and alpha. The correct option is C.
Among gamma, beta, and alpha radiation, gamma radiation has the shortest wavelength. This is because gamma radiation consists of high-energy electromagnetic waves, similar to X-rays and light, but with even shorter wavelengths.
In terms of other properties:
Alpha radiation consists of particles called alpha particles, which are helium nuclei (two protons and two neutrons) that are emitted from the nucleus of an atom during radioactive decay. Alpha particles are relatively large and heavy, and they have a positive charge. They have a short range in air and can be stopped by a piece of paper or human skin, but they can cause significant damage to living tissue if they are inhaled or ingested.
Beta radiation consists of particles called beta particles, which are high-energy electrons or positrons that are emitted from the nucleus of an atom during radioactive decay. Beta particles are smaller and lighter than alpha particles, and they have a negative charge. They have a longer range in air than alpha particles, but they can be stopped by a thin sheet of metal or plastic.
Gamma radiation, as mentioned earlier, consists of high-energy electromagnetic waves. Gamma rays are similar to X-rays but have even higher energies and shorter wavelengths. Gamma rays have the longest range in air and require dense materials, such as lead or concrete, to stop them. Gamma radiation is the most penetrating of the three types of radiation and can cause damage to living tissue if exposure is prolonged.
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Plants make ___________ using carbon dioxide, water and energy from the sun.
a Minerals
b Vitamins
c Carbohydrates
dFats
Answer:
I think it's carbohydrates
Explanation:
The energy from light causes a chemical reaction that breaks down the molecules of carbon dioxide and water and reorganizes them to make the sugar (glucose) and oxygen gas.
Which of the following objects have gravitational potential energy?
A) a diver standing on a diving platform.
B) A hockey puck gliding across the ice.
C) an archers bow that is drawn back.
D) A runner waiting on the starting blocks.
Answer:
An archers bow that is drawn back
Answer:
A)a diver standing on a diving platform.
REQUESTS/REQUIERMENTS:
BRAINLIEST PLEASE
Can y’all help me pleaseeee
prove that total mechanical energy is always constant
Explanation:
We know that the overall mechanical energy of a device stabilizes in the absence of any external force. We know that that the total of potential and kinetic of the freely velocity vector remains same. ,So mechanical energy of a body, underneath gravitation, remains constant.
Which is considered a dark green vegetable?
A.
Carrots
B.
Broccoli
C.
Squash
D.
Green peas
Answer:
Broccoli
Explanation:
Answer:
b. broccoli
Explanation:
took the quiz
hope this helps
A car accelerates from 20.0 m/s to 28.0 m/s over a distance of 50.0 m. What is the car’s acceleration?
Answer:
Explanation:
[tex]V^2=V^2_o+2a(x_f-x_i)[/tex]
[tex]28^2=20^2+2a(50)\\784=400+100a\\384=100a\\a=3.84m/s^2[/tex]
Balok diam diatas bidang miring pada sudut kemiringan 40° balok mulai bergerak,tentukan koefisien gesek statis antara balok dan bidang miring
Answer:
0.84
Explanation:
m = Massa balok
g = Percepatan gravitasi
[tex]\theta[/tex] = Sudut kemiringan
[tex]\mu[/tex] = Koefisien gesekan statik antara balok dan bidang miring
Gaya balok karena beratnya diberikan oleh
[tex]F=mg\sin\theta[/tex]
Gaya gesekan diberikan oleh
[tex]f=\mu mg\cos\theta[/tex]
Kondisi dimana balok mulai bergerak adalah ketika gaya balok akibat beratnya sama dengan gaya gesek pada balok.
[tex]mg\sin\theta=\mu mg\cos\theta\\\Rightarrow \mu=\dfrac{mg\sin\theta}{mg\cos\theta}\\\Rightarrow \mu=\tan\theta\\\Rightarrow \mu=\tan40^{\circ}\\\Rightarrow \mu=0.84[/tex]
Koefisien gesekan statik antara balok dan bidang miring adalah 0.84.
Ek = 12 x m X v2. Re-arrange to give an equation for:
a) The mass m.
b) Velocity squared v2.
c) Velocity.
Answer:
a) [tex]m = \frac{2\cdot E_{k}}{v^{2}}[/tex], b) [tex]v^{2} = \frac{2\cdot E_{k}}{m}[/tex], c) [tex]v = \sqrt{\frac{2\cdot E_{k}}{m } }[/tex]
Explanation:
a) Translational kinetic energy ([tex]E_{k}[/tex]), measured in joules, is represented by the following expression:
[tex]E_{k} = \frac{1}{2}\cdot m \cdot v^{2}[/tex] (1)
Where:
[tex]m[/tex] - Mass, measured in kilograms.
[tex]v[/tex] - Velocity, measured in meters per second.
Now we clear the mass within the formula:
[tex]E_{k} = \frac{1}{2}\cdot m\cdot v^{2}[/tex]
[tex]2\cdot E_{k} = m\cdot v^{2}[/tex]
[tex]m = \frac{2\cdot E_{k}}{v^{2}}[/tex]
b) Now we clear the velocity squared:
[tex]v^{2} = \frac{2\cdot E_{k}}{m}[/tex]
c) Now we clear the velocity:
[tex]v = \sqrt{\frac{2\cdot E_{k}}{m } }[/tex]
How long will it take a rocket traveling at 8km/s to reach 20 km?
Answer:
2.5 seconds
Explanation:
20:8= 2.5 seconds
have a nice day! (^o^)
Answer:
2.5 seconds
Explanation:
20 ÷ 8 = 2.5
That's it.