22)Identify one piece of evidence that led astronomers to infer that the universe is expanding?
23)Identify the force that caused stars and planets in the universe to become layered according to density differences in their composition?
24)Identify the nuclear process that combines lighter elements into heavier elements to produce the energy radiated by stars?
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.
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:
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
when objects are heated they tend to expand because
8. A 0.500 kg model rocket is initially pushed upwards by a thrust force of 15N. If the force of air resistance is 1.00 N, what is the initial acceleration of the rocket?
Answer:
a = 18.19 [tex]m/s^{2}[/tex]
Explanation:
Given
Mass of the rocket m = 0.500 kg
upward force [tex]F_{up}[/tex] = 15 N
Air Resistance [tex]F_{Res}[/tex] = 1.00 N
Solution
Net force = Upward forces - downward forces
Net force = Upward force - (air resistance + weight)
[tex]F_{net} = x_{up} -(F_{Res} +mg )\\\\F_{net} = 15 -( 1 + 0.5 \times 9.81)\\\\F_{net} = 15 - (1+ 4.905)\\\\F_{net} = 9.095[/tex]
Net acceleration
[tex]a = \frac{F_{net} }{m} \\\\a = \frac{9.095 }{0.5}\\\\a = 18.19 m/s^{2}[/tex]
weakly foliated, coarse-grained metamorphic rock that is made mostly of quartz and feldspar is _____. A. skarn B. gneiss C. phyllite D. quartzite
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
which of the following astronomical bodies is the highest in hierarchy
earth
galaxy
solar system
star
Answer:
Galaxy
Explanation:
The astronomical body which is the highest in hierarchical order is the Galaxy.
The order of the astronomical body from the Highest to Lowest include
:Universe, galaxy, solar system, star, planet, moon and asteroid.
In the example above , the order of hierarchy from highest to lowest is Galaxy, Solar system, Star, Earth(planet).
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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Which example best describes the term carrying capacity?
Why can't we see all types of waves in the electromagnetic spectrum?
A spring with a spring constant k of 44 n/m is stretched a distance of 14 cm (0.14 m) from its original unstretched position. what is the increase in potential energy of the spring? j
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.
One atom has 14 neutrons. Another has 13 neutrons. Both have 13 protons. These atoms are...
A. isotopes
B. different elements
C. Molecules
D. Ions
Frequency = 1/T
Based on the equation, determine what happens to the period, T, as the frequency increases
Answer:
the answer is B decreases
Explanation:
A helicopter is traveling at 86.0 km/h at an angle of 35° to the ground. What is the value of Ax? Round your answer to the nearest tenth. km/h
Yeah it is 70.4 for the Ax one and 49.3 for the Ay.
The value of Ax, the x component of the velocity of the helicopter, is approximately 70.5 km/h.
Explanation:The question asks to determine the horizontal component of the velocity (Ax) of a helicopter traveling at 86.0 km/h at an angle of 35° to the ground. To find Ax, we can use the cosine component of the given velocity because the cosine of an angle in a right triangle gives the adjacent side over the hypotenuse, which corresponds to the horizontal component over the total velocity.
To find the value of Ax, we can break down the velocity vector of the helicopter into its x and y components. The x component of the velocity can be found using the formula Vx = V * cos(angle), where V is the magnitude of the velocity and angle is the angle with respect to the ground.
In this case, V = 86.0 km/h and angle = 35°. Plugging in these values, we get Vx = 86.0 km/h * cos(35°) = 70.5 km/h.
So, the value of Ax is approximately 70.5 km/h.
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What did the bataan death march foreshadow about the war in the pacific?
If 1 meter = 3.28 feet, what is the height of the Washington Monument in meters?
The height of the Washington Monument can be found out by unit conversation.
Units conversionUnit conversion is a way of converting some common units into another without changing their real value. for, example, 1 centimeter is equal to 10 mm,
though the real measurement is still the same the units and numerical values have been changed.
The height of the Washington Monument is 554.32 feet.
Given to us1 meter = 3.28 feetTo findthe height of the Washington Monument
SolutionWe know that the height of the Washington Monument is 169 meters.
Therefore,
1 meter = 3.28 feet
169 meters = 3.28 x 169 feet
= 554.32 feet
Hence, the height of the Washington Monument is 554.32 feet.
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Please answer as soon as possible!
A 3.0 cm object is 12.0 cm from a convex mirror that has a focal length of 20.0 cm.
What is the distance of the image from the mirror?
____cm
What is the height of the image?
___cm
Answer:
-30 and 7.5
Explanation:
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
__________ are seismic waves that pass through the earth's interior, spreading out from the focus in all directions.
P-waves and S-waves are seismic waves that pass through the earth's interior, spreading out from the focus in all directions. . P-waves move through solids, liquids, and gases, while S-waves travel only through solids.
Seismic waves are energy waves generated during earthquakes that travel through the Earth's interior, spreading out from the focus.
These waves are categorized into two main types: body waves and surface waves. Body waves, which travel through the Earth's interior, include P-waves (primary waves) and S-waves (secondary waves).Body waves are the first to propagate out from the focus of an earthquake. P-waves are compressional waves that move rock particles forward and backward in the direction of wave travel, allowing them to pass through solids, liquids, and gases. S-waves follow P-waves and are shear waves that move rock particles side-to-side, but they can only travel through solids, not through liquids or gases.Geologists study these seismic waves to understand earthquakes and the Earth's interior structure. As seismic waves travel through different materials, their speed changes, which helps scientists determine the density and composition of various layers within the Earth.Which happened after the electromagnetic and weak nuclear forces were separated from the unified force?
The separation of the electromagnetic and weak nuclear forces from the unified electroweak force led to distinct electromagnetic and weak forces as the universe cooled, which contributed to the conditions necessary for the formation of nucleons.
Explanation:After the electromagnetic and weak nuclear forces were separated from the unified electroweak force, the universe progressed towards the age of nucleons where leptons and hadrons, including protons and neutrons, were in thermal equilibrium. The electroweak force, which combined the electromagnetic and weak nuclear forces at very high temperatures and densities present in the early universe, broke into distinct forces as the universe cooled down. This occurred shortly after the strong nuclear force had already separated from the electroweak force. Importantly, the electric and magnetic forces, despite being different aspects of the single electromagnetic force, remain unified and do not separate under cooler conditions because they rely on each other.
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
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
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:
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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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:
What is the average velocity between 12.00 and 15.00 seconds?
A) 81.0 m/s, east
B)27.00 m/s, east
C)9.00 m/s, east
D)0.0123 m/s, east
Answer: The velocity of abject in a given time interval from 12 seconds to 15 sec is 27 m/s.
Explanation:
Displacement of the object after 12.00 seconds = 144 m
Displacement of the object after 15.00 seconds = 225 m
[tex]Velocity=\frac{\text{Change in Displacement}}{\text{Change in time}}[/tex]
[tex]Velocity=\frac{225 m-144 m}{15 s-12 s}=\frac{81 m}{3 s}=9m/s[/tex]
The velocity of abject in a given time interval from 12 seconds to 15 sec is 27 m/s.