Answer:
t = 1.75
t = 0.04
Explanation:
a)
For part 1 we want to use a kenamatic equation with constant acceleration:
X = 1/2*a*t^2
isolate time
t = sqrt(2X / a)
Plugin known variables. Acceleration is the force of gravity which is 9.8 m/s^2
t = sqrt(2*15m / 9.8m/s^2)
t = 1.75 s
b)
The speed of sound travels at a constant speed therefore we don't need acceleration and can use the equation:
v = d / t
isolate time
t = d / v
plug in known variables
t = 15m / 340m/s
t = 0.04 s
If energy is conserved, then:
O A. initial (PE + KE) = final (PE + KE).
O B. the initial KE must be zero.
O C. the momentum does not change.
O D. PE(before) = KE(before).
If energy is conserved, then initial (PE + KE) = final (PE + KE). So, the correct option is A.
What is meant by Law of Conservation of Energy ?The law of conservation of energy states that, energy can neither be created nor be destroyed, but can be transformed from one form to another.
Here,
According to law of conservation of energy,
The total energy of an isolated system remains constant. That means, the total energy of the system in the initial state will be same as that in the final state.
The total mechanical energy is the sum of kinetic energy and potential energy.
TE = KE + PE
Therefore, the energy to be conserved in the system,
Initial TE = Final TE
So, Initial (KE + PE) = Final (KE + PE)
Hence,
If energy is conserved, then initial (PE + KE) = final (PE + KE).
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in of the Solar System
When the ancient Greeks looked at the night sky they noticed that some points of light seem to wander" in the sky
Which term do we use for these wanderers today?
nebulae
moons
stars
1 planets
2 moons
3 stars
4 Planets
Answer:
stars #3
Explanation:
they didn't know it was stars
A dishwasher has a power of 1 kW. It is used for 2 hours. How much energy will it transfer?
Answer:2kwh
Explanation:
WILL GIVE YOU WHAT EVER YOU WANT JUST HELP ME
Which of the following best compares the structures in protists and fungi that allow these organisms to explore their environment.
Question 2 options:
Protists and fungi move using cilia, flagella, and hyphae.
Some protists move using cilia and flagella. Fungi do not move but have fast growing hyphae.
Protists move using hyphae. Some fungi move using cilia, and flagella.
Neither protists nor fungi have cilia, flagella, and hyphae. They obtain energy only if the food source moves by them.
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Answer:
Explanation:
Essential Knowledge
It is essential that the student be able to distinguish between specialized structures that allow protists and fungi to obtain energy and explore their environment.
Protists
Protists are organisms that are classified into the Kingdom Protista. Although there is a lot of variety within the protists, they do share some common characteristics.
● Protists are usually single celled organisms.
● Live in moist environments.
● Vary in the ways they move and obtain energy.
Protists obtain their energy in several ways.
● Animal-like protists ingest or absorb food after capturing or trapping it.
● Plant-like protists produce food through photosynthesis.
● Fungus-like protists obtain their food by external digestion either as decomposers or as parasites.
● Some protists have both autotrophic and heterotrophic characteristi
The one which best compares the structure in protists and fungi that allow these organism to explore their environment is option B. Some protists move using cilia and flagella. Fungi do not move but have fast growing hyphae.
What are moving aids in protists and fungi ?Protists are the eukaryotes that are not considered to be either fungi, animals, or plants. They are mainly tiny and unicellular. Many unicellular protists are motile and can move by employing flagella, cilia, or pseudopods, especially protozoans.
Cells that employ cilia for movement are typically referred to as ciliates, whereas those that use flagella are typically referred to as flagellates.
In marine, brackish, and freshwater reservoirs, hundreds of species of the ciliate genus Paramecium or flagellated Euglena can be found; the green alga Chlamydomonas is found in soil and freshwater all over the world.
Due of their inability to move, fungi produce spores that resemble seeds. These spores spread by the wind, animals, etc., and seek out new environments to flourish.
As the primary means of vegetative growth in the majority of fungi, hyphae are referred to as a mycelium. Therefore, option B is correct.
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The ____ of a machine is the factor by which it multiplies the force applied to the machine.
The mechanical advantage of a machine is the factor by which it multiplies the force applied to the machine.
How do we find work from a force-displacement graph when the force exerted
is not constant?
Answer:
Explanation:
Read forces directly from the graph.
Read displacements directly from the graph.
Use the area under the graph to find the work done by the force. This is equal to the kinetic or potential energy the object gains due to the application of the force.
How much force is applied if a 130 kg mass is accelerated at 5 m/s^2
Answer:
650N
Explanation:
f = ma
130kg x 5 m/s^2 = 650N
What part of the atom contains the protons and neutrons?
The atom
The electron cloud
The nucleus
The bottom part
What is the speed of a walking person in m/hr if the person travels 1000 m in 30 minutes?
match the microscopes with their useable
Answer:
there is no question that I can use so sorry
Explanation:
but have a great day :D
The geese fly 23 m/s to the south when they migrate for the winter. Identify if this example is speed or velocity.
Answer:
Its velocity.
PLEASE HELP PHYSICS
Wiley coyote pushes a 5kg boulder from an initial height of 10m, the boulder rolls down the hill, across the road, and up the hill on the left. The rock is able to reach a height of 17 m before rolling back down. How fast did Wiley have to push the rock to make this happen?
Answer:
v = 11.7 m / s
Explanation:
For this exercise we can use the conservation of energy
starting point. Where you drop the stone
Em₀ = K + U = ½ m v² + m g h₁
final point. Point where the stone arrives
Em_f = U = mgh₂
We are assuming that there is no friction, so the energy is conserved
Em₀ = Em_f
½ m v² + m g h₁ = m g h₂
v² = 2g (h₂-h₁)
let's calculate
v² = 2 9.8 (17 - 10)
v = √137.2
v = 11.7 m / s
3. How did Kepler's work influence Newton?
Kepler understood that forces caused the motion of planets, but did not understand how to describe this
motion.
Newton understood that forces caused the motion of planets, but did not understand how to describe this
motion.
O Kepler acted as a mentor for Newton as a young astronomer
O Kepler described the motion of planets, but did not explain the cause of this motion
Answer:
How Kepler's work influenced Newton is;
Kepler described the motion of planets, but did not explain the cause of this motion
Explanation:
Kepler's first law states that the motion of the planets are elliptical
Kepler's second law states that the elliptical orbit of the planets round the Sun at the focus of the ellipse is such that an equal area at equal times is swept by the line between the planets and the Sun
Kepler's third law states that the distance of a planet from the Sun and the time it takes the planet to move round the Sun are related mathematically
From Kepler's law Sir Isaac Newton explained the causes of motion
Can someone please help me I don’t understand this
The burning of wood in a campfire is which type of reaction?
A. Exothermic, because energy is absorbed from the surroundings
B. Endothermic, because energy is released to the surroundings
C. Exothermic, because energy is released to the surroundings
D. Endothermic, because energy is absorbed from the surroundings
Which of these organisms is connected to all other organisms in a food web?
carnivores
herbivores
scavengers
decomposers
Answer:
I want to say decomposers, because they break down plants that the herbivores eat, and they can also decompose the remains of a scavenger, herbivore, OR carnivore, that was killed and eaten by a carnivore, and maybe even found and eaten by a scavenger. I'm sorry if it's not correct, that's just what my brain has decided right now
Answer:
The answer is number 4. Decomposers
Explanation:
Hope this helps!!
What work is done when we apply a force of 5N and move in the direction of the force 2m?
Answer:
10 J
Explanation:
work = force x distance
work = 5x2
work = 10 J
Joule is the unit for work
Which of these characteristics will produce the most dense water?(Giving Brainlist For Correct Answer!)
-High salinity, high temperature
-High salinity, low temperature
-Low salinity, high temperature
-Low salinity, low temperature
A net force accelerates a 60 kilogram cart at a rate of 0.5 m/s². What is the magnitude of the force?
Answer:
13
Explanation:
34
How much force is required to accelerate a 15-passenger van weighing 1955 kg at a rate of 26.82 m/s2?
Answer:
52433.1
Explanation: you just multiply the numbers
Taking into account the Newton's second law, a force of 52,433.1 N is required.
Newton's second law, called the fundamental law or fundamental principle of dynamics, states that a body accelerates if a force is applied to it.
So, Newton's second law defines the relationship between force and acceleration mathematically. The acceleration of a body is proportional to the net force applied to it and inversely proportional to its mass. That is, if you apply a greater force, the body increases its acceleration.
Mathematically, Newton's second law is expressed as:
F= m×a
where:
F = Force [N] m = Mass [kg] a = Acceleration [m/s²]In this case, you know:
F= ? m= 1955 kg a= 26.82 m/s²Replacing:
F= 1955 kg × 26.82 m/s²
Solving:
F= 52433.1 N
Finally, a force of 52,433.1 N is required.
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brainly.com/question/23845187?referrer=searchResults brainly.com/question/13959891?referrer=searchResultsThe price of a television was reduced from
$250 to $200. By what percent was the price
of the television reduced?
Answer:
20%
Explanation:
If a ball of radius 0.1 m is suspended in water, density = 997 kg/m^3, what is the volume of water displaced and the buoyant force?
Answer:
Part A
The volume of water displaced is 4.1887902 × 10⁻³ m³
Part B
The buoyant force is approximately 40.93 N
Explanation:
From the question, we have;
The radius of the ball suspended (barely floating) in the water, r = 0.1 m
The density of the water, ρ = 997 kg/m³
Part A
The volume of the ball = The volume of a sphere = (4/3)·π·r³
∴ The volume of the ball = (4/3) × π × 0.1³ = 0.0041887902 m³ = 4.1887902 × 10⁻³ m³
Therefore;
The volume of water displaced, V = The volume of the ball = 4.1887902 × 10⁻³ m³
The volume of water displaced, V = 4.1887902 × 10⁻³ m³
Part B
The buoyant force = The weight of the water displaced = Mass of the water, m × The acceleration due to gravity, g
The buoyant force = m × g
Where;
g ≈ 9.8 m/s²
The mass of the water, m = ρ × V
∴ m = 997 kg/m³ × 4.1887902 × 10⁻³ m³ = 4.17622383 kg
The buoyant force = 4.17622383 kg × 9.8 m/s² ≈ 40.93 N.
1. How does a lunar eclipse happen?
2. How does a solar eclipse happen?
3. Which one occurs more often?
Answer:
1.lunar eclipse- happen when Earths shadow block the sun light
2.solar eclipse-A solar eclipse occurs when a portion of the Earth is engulfed in a shadow cast by the Moon which fully or partially blocks sunlight
3. lunar and solar eclipses occur with about equal frequency. Lunar eclipses are more widely visible because Earth casts a much larger shadow on the Moon during a lunar eclipse than the Moon casts on Earth during a solar eclipse. As a result, you are more likely to see a lunar eclipse than a solar eclipse.
Explanation:
a body has a speed of 80 kilometre per hour how long it will take to travel 120 kilometre
Answer:
1.5 hour
Explanation:
Time = distance/speed
Time= 120/80 = 1.5 hour
which one is this one How does the author describe the conditions for women at the Blackfeet Reservation in Montana?
Answer: b
Explanation:
One difference between a solar flare and a CME is that a solar flare is composed of ___________, while a CME is composed of __________.
Answer:
magnetic energy (proton) and magnetic plasma.
Explanation:
The solar fare consists of bright light that occurs in various wavelengths and is observed at the surface. They are not as strong as compared to the coronal mass ejection or CME. The solar fares consist of 10²² joules, while the plasma is ejected from the solar corona and can be clearly seen from a distance. The Solar flares represent an atmospheric disturbance and plasms are the medium for the growth and development of solar flare and lead to solar activity.Sam studied kinetic and potential energy by observing apples on a tree during a field investigation. Explain what type of energy these apples have.
Answer:
Gravitational Potential Energy
Explanation:
The length of the track itself is 500m. The vehicles (each of mass 15kg) are dragged
along the track back to the top of the ride in stacks of 4. The force required to drag
them at constant speed is 200N
Use an equation from page 2 to calculate the total work done in dragging the stack
back to the start of the ride
Answer:
W = 100000 J = 100 KJ
Explanation:
Here we will use the most basic and general formula of work, which is as follows:
[tex]W = Fd[/tex]
where,
W = Work Done = ?
F = Force Required = 200 N
d = Length of Track = 500 m
Therefore,
[tex]W = (200\ N)(500\ m)\\[/tex]
W = 100000 J = 100 KJ
6. A wave has a frequency of 600 Hz and is traveling at 300 m/s. What is its
wavelength?
Answer:
0.5m
Explanation:
v=f×lamda
v is 300m/s, f is 600Hz, lamda is ?
lamda=v/f
lamda=300/600
lamda =3/6=1/2m
explain the coin in water appears to be raised..
Answer:
defraction
Explanation:
when light passes from a less dense medium(air) into a dense medium(water) the light rays bend towards the normal. This makes the coin look closer