Which statement expresses the relationship between frequency and wavelength of all types of electromagnetic waves?
They are directly proportional to each other
They do not influence each other
they are inversely proportional to each other
They are equal to eachother
For Plato the answer is (they are inversely proportional to each other)
Thanks Taylor! Here is proof, I'm on Plato fyi.
Compared to gamma rays, X–rays have relatively
less energy and short wavelengths.
more energy and short wavelengths.
less energy and long wavelengths.
more energy and long wavelengths.
Substances X and Y are both nonpolar. If the volatility of X is higher than that of Y, what is the best explanation?
X’s molecules experience stronger dipole-dipole forces than Y’s molecules.
Y’s molecules experience stronger dipole-dipole forces than X’s molecules.
X’s molecules experience stronger London dispersion forces than Y’s molecules.
Y’s molecules experience stronger London dispersion forces than X’s molecules. r
The answer is,
D. Y’s molecules experience stronger London dispersion forces than X’s molecules.
(:
In deep space there is very little friction once they are launched into a probe into deep space where there are no external forces acting on it scientists shut the probe's engines off because the scientists want the probe to
Answer:
move at a constant velocity
Explanation:
When the friction is present the engine helps move the probe by constantly doing work against the friction. But when the friction is absent then there is no need for the engine to work all the time. According to newton's first law, no object can change its state of rest or uniform motion with constant velocity without an external force. When the engine is shut off, the probe will continue to move at a constant speed due to inertia.
What is the distance from rest to crest, or from rest to trough, called?
Calculate the change in potential energy of 8,000,000 kg of water dropping 50.0 m over Niagara Falls
Coughing forces the trachea to contract, which affects the velocity v of the air passing through the trachea. Suppose the velocity of the air during coughing is v = k(R-r)r2 where k and R are constants, R is the normal radius of the trachea, and r is the radius during coughing. What radius will produce the maximum air velocity?
To find the radius that maximizes air velocity during coughing, we differentiate the given velocity equation, set it to zero, and solve for the radius. The maximum air velocity occurs when the radius r is two-thirds of the normal radius R. Therefore, the radius that maximizes air velocity is 2R / 3.
To find the radius[tex]\( r \)[/tex]that produces the maximum air velocity v during coughing, we need to maximize the function v = [tex]k(R - r)r^2 \),[/tex] where k and R are constants.First, let's rewrite the function for clarity:
[tex]\[ v(r) = k(R - r)r^2 \][/tex]
To find the maximum value, we need to take the derivative of [tex]\( v(r) \)[/tex] with respect to r , set it equal to zero, and solve for r .
Take the derivative:[tex]\[ \frac{dv}{dr} = k \frac{d}{dr}[(R - r)r^2] \][/tex]
Using the product rule:
[tex]\[ \frac{dv}{dr} = k \left[ (R - r) \cdot \frac{d}{dr}(r^2) + r^2 \cdot \frac{d}{dr}(R - r) \right] \][/tex]
[tex]\[ \frac{dv}{dr} = k \left[ (R - r) \cdot 2r + r^2 \cdot (-1) \right] \][/tex]
[tex]\[ \frac{dv}{dr} = k \left[ 2r(R - r) - r^2 \right] \][/tex]
[tex]\[ \frac{dv}{dr} = k \left[ 2rR - 2r^2 - r^2 \right] \][/tex]
[tex]\[ \frac{dv}{dr} = k \left[ 2rR - 3r^2 \right] \][/tex]
Set the derivative equal to zero:[tex]\[ 0 = k \left[ 2rR - 3r^2 \right] \][/tex]
Since k is a constant and not equal to zero, we can divide both sides by k :
[tex]\[ 0 = 2rR - 3r^2 \][/tex]
Factor out of the r :
[tex]\[ r(2R - 3r) = 0 \][/tex]
So, the solutions are:
[tex]\[ r = 0 \][/tex]
[tex]\[ 2R - 3r = 0 \][/tex]
Solve for r :
[tex]\[ 2R = 3r \][/tex]
[tex]\[ r = \frac{2R}{3} \][/tex]
The solution [tex]\( r = 0 \)[/tex] is not physically meaningful in this context since it would imply the trachea is completely closed. Thus, the radius that produces the maximum air velocity is:
[tex]\[ r = \boxed{\frac{2R}{3}} \][/tex]
How is the ionization energy, E, related to a group of elements?
A. E decreases from left to right.
B. E decreases from right to left.
C. E decreases from top to bottom.
D. E decreases from bottom to top.
How is the ionization energy, E, related to a group of elements?
A. E decreases from left to right.
B. E decreases from right to left.
C. E decreases from top to bottom.
D. E decreases from bottom to top.
E decreases from top to bottom in a group of elements.
high frequency sound waves have a shorter wavelength and a higher A. amplitude B. pitch C. wavelength? than low frequency sound waves
Answer:
its B
Explanation:
If a boulder has a mass of 50 kg and a potential energy of 490 j what is the height of the boulder
What is the lewis dot structure of Na+
The Lewis dot structure for Na+ shows no dots, signifying the loss of its only valence electron and hence its positive charge.
Explanation:The Lewis dot structure of a sodium atom (Na) includes one dot to represent each of its valence electrons. An uncharged sodium atom has equal numbers of protons and electrons (11). However, essentially when sodium becomes an ion (Na+), it loses a valence electron, and thereby, ends up with one more proton (11) than its electrons (10) - making it a cation with a positive charge. The Lewis dot structure for Na+ would therefore have no dots as sodium (Na) has lost its only valance electron during ionization.
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Duncan knows that it takes 36400 cal of energy to heat a pint of water from room temperature to boiling. However, Duncan has prepared ramen noodles so many times he does not need to measure the water carefully. If he happens to heat 0.600 pint of room-temperature water, how many kilojoules of heat energy will have been absorbed by the water at the moment it begins to boil?
A divot is created _____.
when someone digs their heels into the green
when someone digs their heels into the fairway
when shot scrapes off the top of the turf
when someone shoves the club into the green
Answer: when shot scrapes off the top of the turf
Explanation: Divot is a term used in golf, where "Divot" is the piece of turf that is "cuted" out of the ground when the player tries to hit the ball.
Usually, the Iron or the Wedge are the ones that cause the divots, and while it may seem like a poor technique, it is actually pretty a common thing to see. At the point that in some cases, the divot itself is analyzed to see the technique of the player.
The correct option is the third one: "when shot scrapes off the top of the turf"
Is it true or false that at 40 mph, your response time for steering is ½ of a second and you will travel 29 feet during that time
Answer:
"At 40 mph, your response time for steering is ½ of a second and you will travel 29 feet during that time." The statement is true.
Explanation:
Speed, s = 40 mph
Converting mph to m/s :
1 mph = 0.44704 m/s
40 mph = 17.8816 m/s
Time taken, t = 1/2 seconds
Distance covered, d = speed × time
d = 17.8816 m/s × (1/2 s)
d = 8.9408 meters
Now converting meters to feet :
1 meter = 3.28084 foot
So, 8.9408 meters = 29.4 feets
or d = 29 feets
Hence, the given statement is true.
High energy waves have
Choose one answer.
a. long wavelengths and low frequencies.
b. long wavelengths and high frequencies.
c. short wavelengths and low frequencies.
d. short wavelengths and high frequencies
a 20kg rock is on the edge of a 100m cliff. what gravitational energy does the rock process relative to the base of the cliff
The rock has 19600 J of gravitational potential energy relative to the base of the cliff.
The gravitational potential energy [tex]\( E_p \)[/tex] of an object relative to a reference point (in this case, the base of the cliff) can be calculated using the formula:
[tex]\[ E_p = mgh \][/tex]
Where:
m is the mass of the object (20 kg in this case)
g is the acceleration due to gravity (approximately [tex]\( 9.8 \, \text{m/s}^2 \) on Earth)[/tex]
h is the height of the object relative to the reference point (100 m in this case)
Substituting the values:
[tex]\[ E_p = (20 \, \text{kg}) \times (9.8 \, \text{m/s}^2) \times (100 \, \text{m}) \]\[ E_p = 20 \times 9.8 \times 100 \, \text{J} \]\[ E_p = 19600 \, \text{J} \][/tex]
So, the gravitational potential energy that the rock possesses relative to the base of the cliff is [tex]\( 19600 \, \text{J} \).[/tex]
The force component along the displacement varies with the magnitude of the displacement, as shown in the graph. (a) 0 to 1.0 m,
(b) 1.0 to 2.0 m, and
(c) 2.0 to 4.0 m. The force component along the displacement varies with the magnitude of the displacement, as shown in the graph. (a) 0 to 1.0 m,
(b) 1.0 to 2.0 m, and
(c) 2.0 to 4.0 m.
The question pertains to the concept of work done by a force over a displacement, emphasized by the calculation methods for constant and variable forces and illustrated through the area under a force vs. displacement graph.
Explanation:The force component along the displacement varying with the magnitude of the displacement refers to the physical concept of work done by a force along a certain displacement. The work done is calculated by integrating the force component in the direction of displacement over the path taken. When the force component (F cos θ) is constant, the work done is simply the product of this force component and the displacement (d), represented as W = Fd cos θ. However, when the force varies along the displacement, the calculation involves dividing the area under the force vs. displacement graph into strips, calculating the work done for each strip as (F cos θ)i(ave) di, and summing these values to find the total work done. This method highlights that the total work done is equivalent to the area under the curve in a force versus displacement graph, which is a core principle in physics for understanding work and energy.
(a), The force component remains relatively constant
(b), There's a discernible increase in the force component
(c), The force component exhibits a steeper incline
The graph depicts how the force component changes concerning displacement magnitude across three intervals: (a) 0 to 1.0 m, (b) 1.0 to 2.0 m, and (c) 2.0 to 4.0 m.
In segment (a), the force component remains relatively constant, suggesting a consistent force acting within this range.
Transitioning to segment (b), there's a discernible increase in the force component, indicating a proportional rise in force with displacement.
However, in segment (c), the force component exhibits a steeper incline, suggesting a nonlinear relationship where the force increases more rapidly concerning displacement magnitude.
Such variation implies complex interactions between the force and displacement, possibly influenced by factors like material properties, external forces, or system dynamics.
Analyzing these intervals aids in understanding the system's behavior and optimizing its performance within different displacement ranges.
How much of earths water is found in our oceans??
two cars are each traveling at 72 km/h one car is traveling northeast, and the other is traveling south the two cars have different ____
Answer:
Velocities
Explanation:
Given that, two cars are each traveling at 72 km/h one car is traveling northeast, and the other is traveling south. Since, both objects are moving with same speeds but the direction of both cars is opposite. In this case, both cars will have different velocities. Velocity of an object is vector quantity i.e. it will have same magnitude but different velocity.
Hence, two cars have different velocities.
When an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of -183 degrees celsius and the other has a boiling point of -253 degrees celsius. Has a physical change or a chemical change occurred? Explain.
How big is a ton? That is, what is the volume of something that weighs a ton? To be specific, estimate the diameter of a 1-ton rock, but first make a wild guess>: will it be 1 ft across, 3 feet, or the size of a car? (Hint: Rock has mass er volume about three times that of water, which is 1 kg per liter(10^3cm^3) or 62lb per cubic foot) ...?
A 1-ton rock, assuming a roughly spherical shape and a density of rock three times that of water, would be approximately 2.82 feet in diameter, based on weight-volume relationships and the formula for the volume of a sphere.
Explanation:To calculate the size of a 1-ton rock, we must use density. Given that the density of rock equals three times the volume of water, we will use the approximation that rock weighs about 168 pounds per cubic foot (62lb/cubic foot * 3).
A ton, in American usage, is 2000 pounds. So, a cubic foot of rock weighs around 168 pounds. Therefore, a 1-ton rock would be about 2000/168 ≈ 11.9 cubic feet in volume.
To convert volume (in cubic feet) to diameter (assuming a spherical rock), we use the formula for the volume of a sphere, V= 4/3πr³. In this case, we can rearrange the formula to solve for diameter: D= [(6V)/π]^(1/3).
For our 1-ton rock, the diameter, D = [(6*11.9)/π]^(1/3) ≈ 2.82 feet, which is less than 3 feet but more than 1 foot. So, a 1-ton rock would be around 2.82 feet in diameter.
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How would the acceleration of a chain of three shopping carts compare with the acceleration of a single cart if the same force acted on both?
A. 1/3 as much the single
B. 1/2 as much the single
C. 3 times as much the single
D. 2 times as much the single
a = F/m
a' = F/3m
a'/a = 1/3
Based on this, the correct answer would be option A.
1/3 as much the single Hope this helps. Which statement is true about black dwarfs?
A. None currently exist in the universe.
B. They are very hot and massive.
C. They burn brightly for only a few weeks or months.
D. They form after supernova explosions. ...?
Answer:
A. None currently exist in the universe.
Explanation:
It is true that the black dwarfs will be burn brightly for only few weeks or months, and they are going to be very hot and not so massive, and it is going to appear after a white dwarf, but by now, there is just a theory that scientist use, because there is any observation of them.
Bobby tries to push his new big screen TV into the living room. However, Bobby does not push hard enough and cannot move the TV. List and describe the forces that would be included on the free body diagram of Bobby's TV. Be sure to include the name, direction and brief description for each force. ...?
Match each item to its best description.
A.solar nebula
planets orbit a star
B.accretion disk
gas and dust spins
C.solar system
large cloud of gas and dust
The terms 'solar nebula', 'accretion disk', and 'solar system' relate to the stages of formation and structure of planetary systems, with the solar nebula being the initial gas and dust cloud, the accretion disk the rotating material forming planets, and the solar system the final collection of celestial bodies orbiting a star.
Explanation:The student's question involves matching items with the best descriptions related to the formation and structure of astronomical systems:
Solar nebula - A large cloud of gas and dust that eventually forms a solar system. This nebula collapses due to gravity, leading to the formation of a central star and surrounding planets.Accretion disk - A rotating disk of gas and dust found around a newly formed star, where the material coalesces into planetesimals and eventually into planets and other celestial bodies.Solar system - A collection of planets and other celestial bodies orbiting a star, all of which have formed from the collapsing solar nebula.Moreover, the activities suggested in the question focus on investigating various astronomical phenomena such as planetary nebulae and protoplanetary disks, which are critical to understanding star and planet formation.
To match each item to its description, A corresponds to 'a large cloud of gas and dust,' B corresponds to 'gas and dust spins' (accretion process), and C corresponds to 'planets orbit a star' (structure of a solar system).
Explanation:To match each item to its best description:
A. Solar Nebula - A large cloud of gas and dust from which a solar system forms.B. Accretion Disk - A rotating disk of gas and dust, typically found around a newly formed star, where planets can form through accretion.C. Solar System - A collection of planets, moons, asteroids, comets, and other objects that orbit around a central star.The subject matter involves the physical and chemical changes during the solar nebula stage of solar system formation, the process by which terrestrial and giant planets form, and the events in the further evolution of the solar system.
Which best compares AC and DC?
AC flows in one direction, and DC repeatedly switches direction.
DC flows in one direction, and AC repeatedly switches direction
AC is used only in generators, and DC is used only in motors
DC is used only in generators, and AC is used only in motors
Answer: DC flows in one direction, and AC repeatedly switches direction
Explanation:
DC stands for direct current.
AC stands for alternating current.
When current flows only in single direction, it is known as direct current. When current changes direction i.e. it alternates direction, it is known as alternating current.
There are both AC generators and DC generators.
AC generators supply power to home appliances and small motors. DC generators are used to power large electric motors.
AC flows in one direction, and DC repeatedly switches direction.
Explanation:AC flows in one direction, and DC repeatedly switches direction. This is incorrect. AC, or alternating current, periodically changes direction, while DC, or direct current, flows in one direction only. Examples of AC include household electrical outlets and power generated by generators, while DC is commonly used in batteries and electronic devices.
DC flows in one direction, and AC repeatedly switches direction. This is the correct answer. As mentioned earlier, DC flows in one direction, while AC repeatedly switches direction.
Therefore, the best comparison between AC and DC is that DC flows in one direction, and AC repeatedly switches direction.
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Suppose that a sled is accelerating at a rate of 2 m/s^2. if the net force is tripled and the mass is doubled, then what is the the new acceleration of the sled?
By using Newton's second law of motion, we can determine that the new acceleration of the sled when the net force is tripled and the mass is doubled is 3 m/s².
Explanation:To calculate the new acceleration, we will use Newton's second law of motion which is F = m * a, where F is the net force, m is the mass of the object, and a is the acceleration. Initially, consider the force as F = m * a. After the changes, the new force and mass become F' = 3F = 2m * a', where F' is the new force, m' is the new mass, and a' is the new acceleration.
So, now you have the equation 3F = 2m * a'. Substitute the initial force F (m * a) into the equation and you get 3 * m * a = 2m * a'. Now you can solve for the new acceleration a', a' = (3/2) * a. Therefore, the new acceleration of the sled is 1.5 times the original, in this case 1.5 * 2 m/s² = 3 m/s². So the new acceleration of the sled is 3 m/s².
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Which of the following is not a property of cells:
ability to reproduce
using energy for growth
all cells are the same
adapting to their environment
its timed
Describe a compression and a rarefaction of a sound wave traveling through air.
The portion of a longitudinal wave where the atoms are closest to one another is called compression. A rarefaction is an area in a longitudinal wave in which the atoms are the furthest distance from one another. Compression refers to the process of compressing a media, and rarefaction refers to the process of spreading a form of media out.
What is Sound?Sound is a mechanical disruption from an equilibrium position that travels through an elastic medium of material. It is also possible to define sound solely subjectively, as that which is regarded by the ear, but this definition lacks clarity and is overly constrictive because it is useful to talk about sounds that are manufactured by devices other than the human ear, such as dog whistles and sonar machinery, which cannot do hear by human ear.
The features of sound waves must be examined first in any study of sound. Transverse and longitudinal waves are indeed the two fundamental forms of waves, and they vary by the direction in which they move.
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Sam is observing the velocity of a car at different times. After two hours, the velocity of the car is 50 km/h. After six hours, the velocity of the car is 54 km/h.
Part A: Write an equation in two variables in the standard form that can be used to describe the velocity of the car at different times. Show your work and define the variables used.
Part B: How can you graph the equation obtained in Part A for the first six hours?