Answer:
1400joules
Explanation:
work(j)= force × distance.
Distance is from 5m to 12 that is 7m
Force, we weren't given, and the formula is mass × acceleration due to gravity. mass is 20kg and a is 10 or 9.8
f= 20×10
f=200
work= 200 × 7
work= 1400joules
Hope it helped(...and is correct )
Can someone please help me with science
Answer:
Gravity as well as electrostatic and magnetic attraction and repulsion provide real life examples of forces being exerted by one object on another without them being in contact with each other.
Explanation:
Hope that helps!:)
Convection currents will transfer heat throughout a gas until what condition arises?
A.
The gas condenses and forms a liquid.
B.
The gas particles stop moving entirely.
C.
The gas has the same temperature throughout.
D.
The gas has no thermal energy in it.
Answer:
C
Explanation:
pls mark brainlest ty
have a good day
The gas has the same temperature throughout. (C)
please help me out on this...
Only dogs
Only reptiles
Both cats and dogs
Both amphibians and reptiles
Which statements about nonrenewable resources are correct? Check all that apply.
Nonrenewable resources form rapidly.
Even though fossil fuels can still form in nature, fossil fuels are considered nonrenewable resources.
Nonrenewable resources include cotton and wool.
Nonrenewable resources are in limited supply.
Once nonrenewable resources run out, they cannot be replaced.
Answer:
Nonrenewable resources are in limited supply.
Once nonrenewable resources run out, they cannot be replaced.
Even though fossil fuels can still form in nature, fossil fuels are considered nonrenewable resources.
Answer:
Even though fossil fuels can still form in nature, fossil fuels are considered nonrenewable resources. Nonrenewable resources are in limited supply. Once nonrenewable resources run out, they cannot be replaced.
Explanation:
When electromagnetic (EM) radiation is explained using the particle model, which particle-like behavior could be described?
a. EM radiation has a wavelength.
b. EM radiation has a frequency.
c. EM radiation can exhibit interference patterns.
d. EM radiation can move through space without a medium.
Answer:
EM radiation has a wavelength.
Explanation:
When electromagnetic (EM) radiation is explained using the particle model, the EM radiation has a wavelength.
According to De Broglie, all matter has an associated wavelength which is better known as the De Broglie wavelength.
This wavelength is given by; given by λ=h/p
Where;
p = mv
h = Plank's constant
m= mass of the body
v = velocity of the body
p = momentum of the body
Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays.Electromagnetic radiation has a wavelength.
What is electromagnetic waves?Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays
When electromagnetic (EM) radiation is explained using the particle model, the EM radiation has a wavelength.
According to De Broglie, all matter has an associated wavelength which is better known as the De Broglie wavelength.
This wavelength is given by; given by
[tex]\lambda=\dfrac{h}{p}[/tex]
Where;
p = mv
h = Plank's constant
m= mass of the body
v = velocity of the body
p = momentum of the body
Hence Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays.Electromagnetic radiation has a wavelength.
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Escriba un texto sobre el significado que ha tenido para la humanidad la utilización de la electricidad
Explanation:
La electricidad fue uno de los mayores inventos tecnológicos y científicos del mundo que permitió una gran evolución de la sociedad.
Es a través de la electricidad que podemos realizar tareas que parecen tan habituales en la actualidad, como usar luz eléctrica, usar internet, conservar alimentos, tomar baños calientes, y otras tareas que forman parte de la rutina diaria de miles de personas alrededor del mundo. mundo.
Por tanto, es importante observar en un contexto general cómo la electricidad ha traído beneficios a la humanidad, como la conservación de los alimentos por ejemplo, que ha facilitado la vida cotidiana.
En el entorno empresarial, la electricidad posibilitó la creación de máquinas, la automatización del trabajo, lo que facilita las funciones de los empleados, aumenta la seguridad de la empresa, permite el crecimiento empresarial y la aparición de muchos productos y servicios que existen en la economía actual.
En medicina ayudó en el tratamiento de enfermedades, en la creación de medicamentos, etc.
En la sociedad, la electricidad hace posible el saneamiento, permite una mejor calidad de vida para las personas, un mayor intercambio de información y varios otros desarrollos que tienen un impacto directo en la vida de cualquier persona.
Why is physics used to study stars?
A. Stars are interesting.
O B. Stars are circular.
O C. Stars are useful.
O D. Stars are made of matter.
Answer:
stars are made of matter
is doc mcstuffins the best
pretty cool not gonna lie
what is the equation for net force
Answer:
Is to add all forces, for example either the gf = gravitational force
Ff= force fiction
Fn= normal force
Thus, fg + ff + fn = y will give you results
Well then the forces you use in your exercises or questions.
The equation for net force is: ΣF = ma
or, ΣF = Δp/Δt.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.
A spring balance can be used to calculate the Force. Newton is the SI unit of force.
Hence, net force applied on the object = mass × acceleration
ΣF = ma
It can be written in another from as:
net force applied on the object = change in momentum ÷ time interval
ΣF = Δp/Δt
So, the equation for net force is: ΣF = ma
or, ΣF = Δp/Δt.
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The charges of two particles are as follows: Q1=2 x 10 -8 C and Q2 = 3 x 10 -7 C. Find the magnitude of the force between these charges if Q1 is located at (2, 5, 1) and Q2 is located at (3, 2, 3).
Answer:
F = 3.86 x 10⁻⁶ N
Explanation:
First, we will find the distance between the two particles:
[tex]r = \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2+(z_{2}-z_{1})^2}\\[/tex]
where,
r = distance between the particles = ?
(x₁, y₁, z₁) = (2, 5, 1)
(x₂, y₂, z₂) = (3, 2, 3)
Therefore,
[tex]r = \sqrt{(3-2)^2+(2-5)^2+(3-1)^2}\\r = 3.741\ m\\[/tex]
Now, we will calculate the magnitude of the force between the charges by using Coulomb's Law:
[tex]F = \frac{kq_{1}q_{2}}{r^2}\\[/tex]
where,
F = magnitude of force = ?
k = Coulomb's Constant = 9 x 10⁹ Nm²/C²
q₁ = magnitude of first charge = 2 x 10⁻⁸ C
q₂ = magnitude of second charge = 3 x 10⁻⁷ C
r = distance between the charges = 3.741 m
Therefore,
[tex]F = \frac{(9\ x\ 10^9\ Nm^2/C^2)(2\ x\ 10^{-8}\ C)(3\ x\ 10^{-7}\ C)}{(3.741\ m)^2}\\[/tex]
F = 3.86 x 10⁻⁶ N
what is vector product B×A of two vectors A=7i+4j-8k and B=3i-3j+5k
Answer:
[tex]4i+59j+33k[/tex]
Explanation:
Given that,
Vector A = 7i+4j-8k
vector B = 3i-3j+5k
We need to find B×A. It can be calculated as follows :
[tex]B\times A=(3i-3j+5k)\times (7i+4j-8k)\\\\=i (24 - 20) - j (-24 - 35) + k (12 + 21) \\\\=4i+59j+33k[/tex]
So, the value of vector product is [tex]4i+59j+33k[/tex].
an archer shot a 0.06 kg arrow at a target. the arrow accelerated at 5,000 m/s^2 as it left the bow.
What is the force of the arrow?
Answer:
The force of the arrow was 300N.
Explanation:
If a special type of ice has a specific heat capacity of 2060 J/kg K. How
much heat must be absorbed by 2.6 kg of ice at -27.00 C to raise it up to
0.00 C, before any melting takes place?
A. 140,000 J
B. 290,000 J
C. 56,000 J
D. None of the above
Answer:
Q = 144612 Joules.
Explanation:
Given the following data;
Mass = 2.6 kg
Initial temperature = -27°C to Kelvin = 273 + (-27) = 246K
Final temperature = 0°C to Kelvin = 273K
Specific heat capacity = 2060 J/kgK.
To find the quantity of heat absorbed;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
dt = T2 - T1
dt = 273 - 246
dt = 27 K
Substituting the values into the equation, we have;
[tex] Q = 2.6*2060*27[/tex]
Q = 144612 Joules.
Why is this statement false?
As the temperature of water is decreased from 4C to 0C contraction occurs.
The statement is false because as the temperature of water is decreased from 4C to 0C, expansion occurs.
You should understand that this is very weird behavior for any compound ... within a small temperature range, the stuff actually gets bigger as it gets colder. That's why cubes float in your sody, and bergs float in the ocean.
Water is one of only two known substances that do this. And if water didn't do it, then life on Earth would not be possible.
Hmmm....
There is not contraction, Instead expansion occurs .
We know density of water is temperature dependant .
at 4°C water has max density so least volume as density is indirectly proportional to volume.
at 0°C density decreases so volume increases
A slide projector has a magnification of 50. How wide will the projected image be if the slide is 2.8 cm wide?
Answer:
hi = 12mm or 1.2cm
Explanation:
XOXO
Kit ^w^
A slide projector has a magnification of 50. 12mm or 1.2cm.
What is Magnification?Bringing an object as close to the eye as feasible when wishing to observe an object's details is instinctual. The angle that an object subtends at the eye increases with proximity to the eye, making it appear larger.
However, if an item is too near, the eye will no longer be able to generate a distinct image. The creation of a "virtual image" that may be comfortably observed is made possible by the use of a magnifying lens between the observer and the object.
The magnifier should be positioned exactly in front of the eye to provide the clearest image possible. Once a clear image of the thing is present, the object of interest is brought closer to the eye.
Therefore, A slide projector has a magnification of 50. 12mm or 1.2cm.
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is it true that the radiation that transfer thermal energy is a type of electromagnetic radiation
Answer:
Since heat is carried by electromagnetic waves, it does not need a physical medium to transfer it. Instead it radiates through space - this is how the Earth is heated by the Sun despite space being a vacuum.
Explanation:
Explain why there is a voltage between the two terminals of the secondary coil
Answer:
The coils are not electrically connected. ... the primary coil current produces a magnetic field, which changes as the current changes. the iron core increases the strength of the magnetic field. the changing magnetic field induces a changing potential difference (voltage) in the secondary coil.
There is a voltage between the two terminals of the secondary coil because the magnetic field/magnetic flux is strengthened by the iron core. The secondary coil's potential difference (voltage) changes as the magnetic field changes. Energy is transferred by law of conversation .
What is magnetic flux?
Magnetic flux is the number of magnetic field lines passing through a closed surface.
What is electromagnetic induction?There is a change in magnetic flux associated with a coil it gives rise to an induced current and hence an induced EMF in the coil. This phenomenon is called electromagnetic induction.
What is law of conservation of energy?Law of conservation of energy states that energy can neither be created nor be destroyed . It can only be converted from one form to another form.
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PLEASE HELP!!!!!!! A student is trying to demonstrate static electricity, so they rub two identical balloons with a neutral rabbit fur to give them a charge. How
do these three objects now behave when brought near to each other?
A. They all attract each other.
B. The balloons repel each other but attract the rabbit fur.
O C. They all repel each other.
O D. The balloons attract each other but repel the rabbit fur.
I uploaded the answer to a file hosting. Here's link:
tinyurl.com/wpazsebu
What could you have done to reduce those errors?
When heat is added to ice, the first change it goes through will be which of the following?
It will begin to boil.
It will melt into a liquid.
It will turn into steam.
It will become a vapor.
Answer:
it will begin to melt into a liquid
Explanation:the ice will melt first before turning into a liquid.
Geologists know the past temperature of the planet based on rock and fossil evidence. Why do you think it is difficult to determine what has caused climate change in the distant past?
Answer:
I think it is difficult to determine what has caused climate change in the distant past because it must have been a long time ago so geologists can't carry out different experiments and figure out what gases the planet had conjured, so geologists can only make predictions based off the evidence they currently have from what the planet looked like before. The planet must have changed over the years, therefore the climate has also changed in the future, so they cannot work with how the planet looked in the past.
If you add more hot water than cold water, will the temperature of the cold water change more?
Answer:
Yes because of the temputer
Explanation:
yes cause of the tempture
What is the starting and final form of energy for someone playing the piano
X=Y=MC scourer that would be the answer for you mam or sir
Me das mas información?
Answer:
jello
Explanation:
it jiggles
on
Draw
3. The weight of a body varies from location to location. Where would the weight of the
body be least
On the moon
At sea level on earth
On top of Mount Everest
In space
4. We meet many different types of force every day. Some of these are shown in the list
below. However, one of these is NOT a force. Which one is it?
A
Speed
B
Push
C
Pull
Friction
Answer:
it's C a pull friction
Explanation:
because it's all said in the explained
__________ is the
process by which populations change over
time.
Evolution, is a process that results in changes in the genetic material of a population over time.
A car goes East from 2 m/s to 16m/s in 3.5s. What is the Car's acceleration?
In a tropic level, energy flows from the producer to the primary consumer and to a secondary consumer. True False
Answer:
True
Explanation:
This is true because in an energy flow, the primary producers such as plants produce their own foods by using energy from the sun. These primary producers are consumed by primary consumers such as rabbits for food, while secondary consumers such as snakes would consume the primary consumers.
By so doing, energy flows from one trophic level to the other.
A 0.035 bullet strikes a 5kg wooden block that is stationary and gets stuck inside the block. The block and bullet move together at 8.6 m/s. What is the initial velocity of the bullet?
Answer:
1240 m/s
Explanation:
[Do you mean 0.035 kg bullet?]
Since the momentum of the system is conserved,
Let u m/s be the initial velocity of the bullet
0.035u = 8.6(5+0.035)
u ~= 1237.1714 m/s
u = 1240 m/s (3 sig. fig.)
This problem has been solved! See the answer A 21.5 kg person climbs up a uniform 85 N ladder. The upper end of the ladder rests on a frictionless wall. The bottom of the ladder rests on a floor with a rough surface. The angle between the horizontal and the ladder is 59 ◦. The person can climb 78 % up the ladder before the base of the ladder slips on the floor. What is the coefficient of static friction µs between the base of the ladder and the floor? The acceleration of gravity is 9.8m/s 2 .
Answer:
μ = 0.179
Explanation:
For this exercise we use the rotational equilibrium condition, where we set a reference system at the top of the ladder where it is in contact with the parent, we will assume the counterclockwise rotations as positive
∑ τ = 0
W_stairs x/2 + W_man x’+ fr y - N x = 0
fr y = -W_stairs x/2 - W_man x’ + N x
let's use trigonometry for distances
* the man up the ladder 78%
l ’= 0.78 L
cos 59 = x ’/ l’
x’= 0.78 L cos 59
* the horizontal distance
cos 59 = x / L
x = L cos 59
* vertical distance
sin 59 = Y / L
y = L sin 59
we substitute
fr L sin 59 = -W_stairs Lcos59 / 2 - W_man 0.78 L cos59 + N L cos59
fr sin 59 = - ½ W_stairs cos 59 - 0.78 W_man cos 59 + N cos 59
fr = ctan 59 (N - ½ W_stairs - 0.78 W_man) (1)
Let's write the translational equilibrium equations
Y axis
N -W_stairs - W_man = 0
N = W_stairs + W_man
N = 85 + 21.5 9.8
N = 295.7 N
we substitute in 1
fr = ctg 59 (295.7 - ½ 85 - 0.78 21.5 9.8)
fr = 0.6 (295.7 - 42.5 - 164.346)
fr = 52.89 N
the expression for the friction force is
fr = μ N
μ = fr / N
μ = 52.89 / 295.7
μ = 0.179