Answer:
D) Mechanical systems need an external energy source to maintain their
Explanation:
Mechanical systems need an external energy source to maintain their motion.
In this case, electrical energy is transformed to mechanical energy. Without electrical energy, the carousel slows due to friction and eventually stops.
A sprinkler sprays water out of a hose with a velocity of 6.3 m/s. if the sprinkler is aimed 25° above the ground, at what distance from the sprinkler does the water hit the ground? ignore air resistance and use 9.8 m/s2 for acceleration due to gravity.
Final answer:
To determine the distance the water hits the ground from the sprinkler, projectile motion principles are applied, separating the initial velocity into horizontal and vertical components and then calculating the time of flight and horizontal distance.
Explanation:
A student asked how far water will hit the ground if a sprinkler sprays water at a velocity of 6.3 m/s, aimed 25 degrees above the ground, ignoring air resistance. To solve this, we use the principles of projectile motion. First, decompose the initial velocity into horizontal (vx) and vertical (vy) components. The horizontal velocity, vx = v × cos(θ) and the vertical velocity, vy = v × sin(θ), where θ is the launch angle and v is the initial velocity.
For a projectile landed on the same level from which it was launched, the time of flight, t, is given by t = 2 × vy / g, where g is the acceleration due to gravity (9.8 m/s2). The horizontal distance, or range, R, is then R = vx × t. Substituting the given values, vx = 6.3 × cos(25°) and vy = 6.3 × sin(25°), we can find t and subsequently R.
Which example best describes the term carrying capacity?
Which of the following statements is true regarding how blackbody radiation changes as the temperature of the radiating object increases?
The maximum intensity increases, and the peak wavelength decreases.
The maximum intensity decreases, and the peak wavelength increases.
Both the maximum intensity and the peak wavelength decrease.
Both the maximum intensity and the peak wavelength increase.
Final answer:
The correct answer is that as the temperature of a blackbody radiator increases, the maximum intensity of radiation increases, and the peak wavelength decreases, resulting in a shift towards shorter wavelengths and more intense radiation.
Explanation:
The correct statement regarding how blackbody radiation changes as the temperature of the radiating object increases is that the maximum intensity increases, and the peak wavelength decreases. The distribution curves of blackbody radiation indicate that with higher temperatures, the intensity of radiation becomes greater, and the peak of the curve shifts toward shorter wavelengths. Objects such as lava become visible to the human eye at high enough temperatures, emitting radiation that progresses through colors red, orange, yellow, and eventually white as temperature increases - each color representing a decrease in wavelength and an increase in intensity.
Which of the following increases the speed of waves in a stretched elastic cord?
weakly foliated, coarse-grained metamorphic rock that is made mostly of quartz and feldspar is _____. A. skarn B. gneiss C. phyllite D. quartzite
If the angular momentum of an object increases, which of these could be true?
A. the angular velocity of the object decreased.
B. The mass of the object decreased.
C. The momentum of inertia increased.
D. The object's momentum of inertia decreased.
A sound wave has frequency of 430 Hz in air . Which of these is closet to the wavelength of this sound? ( The speed of sound in air is 343 m/s.)
A. The height of a skyscraper
B. The length of car
C. The height of a tree
D. The width of highway
E. The height of a desk
. Alfonso pushes a box on a well waxed (frictionless) floor to the right with a 20 N force causing it to accelerate at 1.5 m/s2 . What is the mass of the box?
Answer:
The answer is m = 13.33Kg
Step by Step Explanation:
1- Taking into account Newton's second law (also known as the fundamental law of dynamics) we know that force is directly proportional to the mass and acceleration of a body.
2- This law is represented by the formula f = m.a where (f) represents force, (m) mass and (a) acceleration.
3- Having this formula, we can clear the mass (m) and replace the data given in the problem.
f = m.a
[tex]m = \frac{f}{a} \\m = \frac{20N}{1.5m/s^{2} } \\m = 13.33 kg[/tex]
A light beam in air strikes the surface of water at an angle of 35° to the normal. When it enters the water it bends toward the normal, making an angle of 25.5° to it. The velocity of light in air is approximately 300,000 km/s. What is the approximate velocity of light in water? A. 77,000 km/s B. 225,000 km/s C. 278,000 km/s D. 341,000 km/s
A soccer ball has 1200 j of kinetic energy and a mass of o.8 kg what is the speed of the ball when it is kicked
A brick moves across a rough surface at constant velocity. Which of the following are forces that should be included in a free body diagram? (select all that apply) gravity friction applied force force of motion
Answer:
the force that are included here is given as
1) Gravity
2) Friction
3) Applied force
Explanation:
As per the Force diagram of the moving block
We know that the block is moving with constant speed
so here the applied force on the block is counter balanced by the friction force due to ground
Also we can see that the the Normal force due to ground is also counter balanced by the weight or force of gravity on it
So the force that are included here is given as
1) Gravity
2) Friction
3) Applied force
the table shows information about the moons of mars what is the orbital period of deimos?
A. 0.0806 days
B. 0.798 days
C. 1.26 days
D. 1.59 days
#please #asap
The table shows information about the moons of mars what is the orbital period of Deimos 1.26 days.
What is time period?The amount of time a given astronomical object takes to complete one orbit around another object.
The table is missing, however I found the value of the orbital time period of Deimos on the web:
t = 30.4 hours
So, 30.4 hours. With a simple proportion we can convert it in days:
1 d: 24 h = x : 30.4 h
from which we find
x = 1.26 day
So, 1.26 days,
The table shows information about the moons of mars what is the orbital time period of Deimos 1.26 days.
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Which bright solar feature is shown in the picture above?
Solar flare
Prominence
Sunspot
Convection zone
Answer : (B) Prominence
Explanation :
A large, glittering and gaseous characteristic which is extending outward from the surface of the sun is called Prominence.
Photosphere is one of the layer of sun where the prominence are anchored and then they move into the corona of the sun.
Corona is a region in the surface of the sun which is the constituent of hot ionized gases (plasma).
The prominence consists of colder plasma and this prominence plasma is much more shining and denser as compared to coronal plasma.
Hence, the correct option is (B) Prominence.
Answer:the answer is a
Explanation:
when i answered the first time i answered prominence and that wa swrong so then i did some researech and the answer is a solar flare
In the equation for Hooke’s Law, F = –kx, the term k represents the spring constant of a spring. True or False
the answer is True
What the difference between monatomic and colloidal gold?
Final answer:
Monatomic gold refers to individual gold atoms, while colloidal gold includes particles between 1 nanometer and 1 micrometer dispersed in a medium, displaying unique properties such as long-term stability and distinctive colors due to light absorption and scattering.
Explanation:
The difference between monatomic gold (Au) and colloidal gold lies in the size and dispersion of the gold particles. Monatomic gold refers to gold atoms that are not bonded to any other atoms, essentially in an isolated form. In contrast, colloidal gold consists of gold particles that are of colloidal size, meaning they range between 1 nanometer to 1 micrometer in diameter, and are dispersed in another substance, such as water. Colloidal particles are in a kind of “no person's land” between true solutions and solid particles, often not settling under gravity and can exhibit interesting properties such as the characteristic wine-red color of colloidal gold solutions due to selective absorption and scattering of light.
Colloidal gold is highly stable and can remain intact for many years, as illustrated by gold sols created in 1857 that are still intact. The state of dispersion and the color of colloidal gold can change with varying conditions such as particle size or environmental factors. On the other hand, monatomic atoms do not have such collective properties. Colloidal gold plays a significant role in various applications including medical diagnostics, due to its unique optical and chemical characteristics.
what steps are involved in creating hydroelectric power?
Answer:
Water falls from a reservoir through a channel to a turbine. The water turns the turbines, which allows the generator to make electricity.
It is falling instead of flowing, because elavation is an important part of the hydroeletric power plant, since gravity is a thing, and there was elevation, than it would be falling and not flowing.
Answer:
b
Explanation:
in the diagram the solid eventually becomes a gas what will happen to bring the substance from a solid to a gas
A(n) a0 is software that contains rows and columns used to make calculations, organize information, and make comparisons.
A spreadsheet is software that is essential for performing a variety of tasks involving the organization and manipulation of data. It consists of multiple rows and columns that together create a grid, where data is stored and calculations can be made.
Each box, known as a cell, can hold individual pieces of data including text, numbers, and formulas. For instance, in Microsoft® Excel, a highly popular spreadsheet application, columns are identified with letters and rows with numbers. A cell at the intersection of column B and row 3 would be labeled as B3. Spreadsheets are widely used across different fields for data analysis, mathematical calculations, and information management.
When it comes to matrix algebra, spreadsheets also provide functionality to handle matrices, which are arrays of numbers arranged in rows and columns. The operations performed on matrices in a spreadsheet can range from basic arithmetic to more complex functions such as matrix multiplication or inversion.
Moreover, spreadsheets allow users to create charts, a visual representation of their data, making it easier to spot trends and patterns. Overall, spreadsheets are versatile tools that serve as an indispensable asset in both educational and professional settings.
when objects are heated they tend to expand because
What is the end product of glycolysis when oxygen is not present?
A)
When oxygen is not available, glycolysis produces lactate as its byproduct.Option A is correct.
What is glycolysis?A process through which cells partially break down glucose via oxygen-free enzyme activities. One process that cells employ to make energy is glycolysis.
The breakdown of glucose can occur more completely and more energy can be created when glycolysis is combined with other enzyme activities that require oxygen.
Pyruvate, the last result of glycolysis, is fermented to produce lactic acid, ethanol, and CO₂ in the absence of oxygen. Anaerobic respiration is the term for it.
Lactate is the end product of glycolysis when oxygen is not present.
Hence, option A is correct.
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What is a nuclear bulge?
a) The bulging corner of a spiral galaxy consisting of gas in the shape of a spiral sphere that circles a galaxy
b) The bulging center of a spiral galaxy consisting of debris in the shape of a flattened sphere that circles a black hole
c) The bulging corner of a spiral galaxy consisting of debris in the shape of a flattened sphere that circles a black hole
d) The bulging center of a spiral galaxy consisting of stars in the shape of a flattened sphere that circles a black hole
Answer: d) The bulging center of a spiral galaxy consisting of stars in the shape of a flattened sphere that circles a black hole
Explanation:
Bulge is part of star at the center where stars are closely packed. Most of the spiral galaxies have Bulge at their heart that is at their center. The shape of a bulge resembles that of a flattened sphere. Most of the bulges have high compact mass at their center about which the stars rotate. This high compact mass at the center is assumed to be super-massive black-hole.
Thus, a nuclear bulge can be defines as: d) The bulging center of a spiral galaxy consisting of stars in the shape of a flattened sphere that circles a black hole
Physical fitness is related to our ability to carry out daily tasks without being too tired or sore. Please select the best answer from the choices provided. T F
The statement 'physical fitness is related to our ability to carry out daily tasks without being too tired or sore' is TRUE.
What is physical fitness?Physical fitness refers to the physical activities that involve the concerted functioning of the heart, lungs, and muscles.
Physical fitness is fundamental for improving the ability to carry out different tasks without being tired.Physical fitness is not only important from a physical perspective but also helps to positively enhance our mental health.In conclusion, the statement 'physical fitness is related to our ability to carry out daily tasks without being too tired or sore' is TRUE.
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Answer:
true
Explanation:
Which two elements are abundant in the fresh crust that comes from a spreading center?
The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?
suppose you have two bar magnets. Only one of the magnets has the north and south poles labeled. How would you determine which was the north and which was the south pole on the unlabeled magnet?
You could use the labeled magnet to attract and repel the unlabeled magnet, as opposite poles will attract and like poles will repel each other, allowing you to determine which is the north and south pole on the unlabeled magnet.
What is a magnet?A magnet is a material that creates a magnetic field and has the ability to attract or repel other magnets or magnetic materials. Magnets have north and south poles, and the direction of the magnetic field is from the north to the south pole.
Natural magnets are minerals, while man-made magnets are made by magnetizing a suitable material. Magnets are used in many technological applications, such as motors, generators, and compasses.
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The chart below shows the amount of coal mined in four different states of USA in the year 2005.
State Amount of coal mined (in billion tons)
West Virginia 37
Wyoming 68
Montana 120
Illinois 78
In which state was the greatest amount of coal mined in 2005?
Illinois
Montana
Wyoming
West Virginia
Answer:
The answer is Montana...
Explanation:
Because it says 120 coal are mined in 2005...
So, thats why Montana is it...
Hope this helps.....
a powerboat accelerates along a straight path from 0 km/hr to 99.8 km/hr in 10.0 s.Find the average acceleration of the boat in meters per second squared.
If a current of 0.5 A flows in a 75 W light bulb when the voltage difference between the ends of the filament is 150 V, what is the resistance of the filament?
Answer:
300 would be the best anwer.
Explanation:
can an object have a northward velocity and a southward acceleration?
Devonte pushes a wheelbarrow with 830 W of power. How much work is required to get the wheelbarrow across the yard in 11 s? Round your answer to two significant figures.
Answer: To get the wheelbarrow across the yard in 11 s Is required 9,100 J of work.
Explanation:
Hi, to solve this problem we have to apply the formula:
Power (w) = work (J) / time (sec)
So, replacing the variables with the values given:
830 w = work / 11sec
Isolating work we have:
830 w / 11 sec = work
Work = 9,130 J = 9,100 j (rounded to two significant figures)
To get the wheelbarrow across the yard in 11 s Is required 9,100 J of work.
Feel free to ask for more if it´s necessary or if you did not understand something.
Answer:
9100
Explanation:
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