Answer:
2.5 m/s
Explanation:
The speed of a wave is given by:
[tex]v=f\lambda[/tex]
where
f is the frequency
[tex]\lambda[/tex] is the wavelength
The wave in this problem hits the beach about every 2.0 seconds: this means that its period is 2.0 s. So the frequency is the reciprocal of the period
[tex]f=\frac{1}{2.0 s}=0.5 Hz[/tex]
The crests are 5.0 m away from each other, so the wavelength is
[tex]\lambda=5.0 m[/tex]
Therefore, the speed of the wave is
[tex]v=(0.5 Hz)(5.0 m)=2.5 m/s[/tex]
our galaxy is Spiral, elliptical or irregular?
AnsWER
JANNAH
Explanation:
BECAUSE
Which term refers to a quantity that has both magnitude and direction
A vector is any quantity that has magnitude and direction. A scalar is any quantity that has magnitude but has no direction.Displacement and velocity are vectors, distamce and speed are scalars.
The term referring to a quantity with both magnitude and direction is vector. The concept of vector differentiates it from a scalar which only has magnitude. An example is velocity, which is a vector measurement.
Explanation:The term that refers to a quantity that has both magnitude and direction in physics is known as a vector. This differentiates it from a scalar which only has magnitude. For instance, velocity is a vector quantity because it includes both speed (a scalar quantity) and direction. If you say a car is moving at 60 miles per hour, that's speed. But if you say the car is moving at 60 miles per hour to the north, that's velocity, which is a vector measurement.Physics is the branch of science that deals with the study of matter, energy, and the interactions between them. It includes the study of various physical quantities, including those that have both magnitude and direction. One such quantity is velocity, which is defined as the rate of change of displacement with respect to time. Velocity has both magnitude (speed) and direction (the direction of motion).
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what happens when you "crack/pop your knuckles?
It could result in it not being good for your joints, as well as in the long run but shouldn't cause problems when your a child. I hope this helps your question!
As heat is removed from a substance what is the order of phrase it passes through
What are the choices to pick from? : )
Which choice describes how energy is transferred at the particle level through the process of conduction?
A. The fast-moving particles in the colder material collide with the slow-moving particles in the hotter object. The collisions transfer energy from the fast-moving particles to the slow-moving particles, increasing their speed and thermal energy.
B. The fast-moving particles in the hotter material collide with the slow-moving particles in the colder object. The collisions transfer energy from the fast-moving particles to the slow-moving particles, increasing their speed and thermal energy.
C. The fast-moving particles in the colder material move into the hotter material. The slow-moving particles in the hotter material move into the colder material. The two materials switch temperatures.
D. The fast-moving particles in the hotter material move into the colder material. The slow-moving particles in the colder material move into the hotter material. The two materials switch temperatures.
The answer is B. Because the two materials will not switch temperature, heat is only transferred from a hotter material to a colder material to achieve equilibrium in temperature. Thus, option C and D is out. Option A is also wrong because the faster moving particles should be in the hotter material not the colder material, this is because when the material is hot, the kinetic energy of the particles increase, causing it to move faster.
Which of the following is the best definition of light energy?
A.
The energy that travels as longitudinal pressure waves.
B.
The form of energy that travels as electromagnetic waves.
C.
The form of energy associated with the random motion of atoms or molecules within a substance.
D.
Energy that is stored in an object due to its position or configuration.
Answer:
B.
The form of energy that travels as electromagnetic waves.
Explanation:
Light energy, or electromagnetic field energy, is the form of energy that travels as electromagnetic waves. These waves do not need a medium through with to travel, so they are able to travel through the vacuum of outer space. Some types of light can be sensed by the human eye.
The best definition given is B: light energy is the form of energy that travels as electromagnetic waves, and this form of energy includes both wavelike behavior and particle-like characteristics as photons.
Explanation:The best definition of light energy among the given options is B. The form of energy that travels as electromagnetic waves.
Light energy is a form of electromagnetic radiation that moves through a vacuum at a constant speed of approximately 3 × 108 meters per second. This radiation exhibits wavelike behavior, which includes a frequency (v) and a wavelength (λ), adhering to the equation c = λv, where c represents the speed of light. Additionally, light can be described as a stream of particles called photons, capturing the dual nature of electromagnetic radiation as both waves and particles, a concept referred to as wave-particle duality.
Light energy is best defined as the form of energy that travels as electromagnetic waves. Light is an example of a transverse wave, where the oscillations occur in the electric and magnetic fields perpendicular to the direction of motion. It exhibits both wave-like and particle-like behavior, known as wave-particle duality, and can be described as a stream of particles called photons, with energy related to the frequency or wavelength of the light.
Elena makes a table to organize the functions of electric motor components.
Which functions belong in the cells marked X and Y?
component function
brush X
commutator Y
A. X: Conducts current to the armature and reverses direction of current
Y: Rotates as a result of changing magnetic forces
B. X: Rotates as a result of changing magnetic forces
Y: Conducts current to the armature and reverses direction of current
C. X: Allows current to flow into the commutator
Y: Conducts current to the armature and reverses direction of current
D. X: Allows current to flow into the commutator
Y: Rotates as a result of changing magnetic forces
Answer:
C. X: Allows current to flow into the commutator
Y: Conducts current to the armature and reverses direction of current
Explanation:
Carbon brush is a motor brush that acts as the conducting block for current between the stator and the rotor of a motor.It is made of carbon blocks.The brush is held in place using a spring that ensures its contact position with the commutator.The commutator prevents the torque on the motor from reversing whenever the coil is rotating in the magnetic field.
Answer:
C
Explanation:
im smart
it takes a school bus full of kids longer to stop than it does a small car with a single passenger. which law is this an example o?
Newton´s second law of motion
Final answer:
The reason a school bus full of kids takes longer to stop than a small car can be attributed to Newton's Second Law of Motion and the fact that kinetic energy increases with the square of the speed, requiring more work to stop a more massive vehicle like a school bus.
Explanation:
The phenomenon where a school bus full of kids takes longer to stop than a small car can be explained by Newton's Second Law of Motion, which states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. The more mass an object has, like a school bus with children, the more force is needed for it to change its state of motion. When stopping, the required force translates to the braking force, which must overcome the kinetic energy of the vehicle. Since kinetic energy increases with the square of the speed, and because a school bus has a greater mass, it has significantly more kinetic energy than a small car at the same speed. This results in a longer stopping distance for the school bus, as the brakes need to do more work to reduce its kinetic energy to zero.
metal cutters have long handles. why
Explanation:
To provide the leverage needed to produce enough force to overcome what you're trying to cut.
Kinetic energy and mass are
proportional.
kinetic energy and mass are dieectly proportional
Answer:
Kinetic energy and mass are directly proportional to each other
Explanation:
As we know by the formula of kinetic energy
[tex]KE = \frac{1}{2}mv^2[/tex]
now we know that
kinetic energy depends on the mass of object and it is product of mass and square of the speed.
Here we can say that if mass is doubled then kinetic energy also get double and if mass is decreased then kinetic energy also decreases
This type of relationship is known as direct relationship and here since it shows direct relationship so correct answer will be
Kinetic energy and mass are directly proportional to each other
An X-ray tube emits X-rays with a wavelength of 1.0 X 10^-11 m. Determine the energy, in electron volts, possessed by the incident electrons
Answer:
[tex]1.25\cdot 10^5 eV[/tex]
Explanation:
The energy of the incident electron is equal to the energy acquired by the X-rays photon emitted by the tube, which is given by
[tex]E=\frac{hc}{\lambda}[/tex]
where
h is the Planck constant
c is the speed of light
[tex]\lambda[/tex] is the wavelength
In this problem, the wavelength of the photon is
[tex]\lambda=1.0\cdot 10^{-11} m[/tex]
Therefore, the energy is
[tex]E=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{1.0\cdot 10^{-11} m}=2.0\cdot 10^{-14} J[/tex]
And keeping in mind that
[tex]1 eV = 1.6\cdot 10^{-19} J[/tex]
We find the energy in electron volts:
[tex]E=\frac{2.0\cdot 10^{-14}J}{1.6\cdot 10^{-19} J/eV}=1.25\cdot 10^5 eV[/tex]
5. Limestone typically doesn't accumulate in the ocean at depths below 4,000 meters because below that depth, calcite is _______.
6. Based on the principle of original horizontality, geologists conclude that layers of sedimentary rock that have been tilted must have been subjected to _______.
7. Based on the principle of inclusions, the cobbles in conglomerate must have been formed _______ the conglomerate.
8. Geologists use the principle of _______ to justify using fossils in a sample of sedimentary rock to determine the rock’s age.
9. Partings between adjacent beds of sedimentary rock may represent periods of _______, which could range from a few decades to a few centuries.
10. Some graded beds, especially those resulting from deposition by a fast-moving debris flow, are reversed, which means _______ material is at the top instead of at the bottom.
Answer:
Explanation:
5. Limestone typically doesn't accumulate in the ocean at depths below 4,000 meters because below that depth, calcite is ___not preserved ____.
The calcite compensation depth CCD is the depth at which the rate of dissolution of calcite increases beyond that of accumulation.
6. Based on the principle of original horizontality, geologists conclude that layers of sedimentary rock that have been tilted must have been subjected to __tectonic forces_____.
Tectonic forces causes changes in a particle terrain
7. Based on the principle of inclusions, the cobbles in conglomerate must have been formed __earlier than_____ the conglomerate.
The principle of inclusion states that the inclusion is older than the rock that contains it.
8. Geologists use the principle of __fossil and fauna succession _____ to justify using fossils in a sample of sedimentary rock to determine the rock’s age.
The principle of fossil and fauna succession was credited to Williams Smith and it is used for relative dating of a sedimentary sequence. Here, fossils of plants and animals are used to date a sequence.
9. Partings between adjacent beds of sedimentary rock may represent periods of __unconformity _____, which could range from a few decades to a few centuries.
An unconformity is a period of non-depsotion or erosion within a rock layer.
10. Some graded beds, especially those resulting from deposition by a fast-moving debris flow, are reversed, which means ___the oldest____ material is at the top instead of at the bottom.
From the principle of superposition of strata, we know that the oldest layer is at the bottom of the sequence and the youngest is on top.
Answer:
1. high energy
2. deposition
3. Silt
4. limestone
5. Soluble
6. tectonic forces
7. before
8. principle of faunal succession
9. non deposition
10. coarser
which part of the ear receives the signal from the eardrum?
The ossicles, a trio of tiny bones in the middle ear, receive sound vibrations from the eardrum and transfer them to the cochlea, which then converts them into electrical signals for the brain.
The part of the ear that receives the signal from the eardrum is the ossicles in the middle ear. Once the eardrum, or tympanic membrane, vibrates in response to sound waves, it transfers these vibrations to the ossicles. These three tiny bones - the malleus (hammer), incus (anvil), and stapes (stirrup) - act as a lever system, amplifying the sound vibrations and transmitting them to the cochlea in the inner ear. Inside the cochlea, the mechanical vibrations are converted into electrical signals by hair cells, and these signals are then transmitted to the brain via the auditory nerve.
What is the length of the hypotenuse of a right triangle, whose legs have lengths of 12 meters and 35 meters?
Answer:
c
Explanation:
A skier on a hill has 4000J of kinetic energy and 3000J of potential energy. After sliding down the
hill a ways, their potential energy is 2000J.
a) Since they slid "down" the hill, what do you expect for change in potential energy (greater or
less)? Why?
b) Assuming that there is no loss due to friction, what would be the kinetic energy at the second
position? (Use Ebefore = Eafter and show all steps)
c) Since there's always "some" friction loss, would the "actual" kinetic energy be less or more than
your answer in b)?
Answer:
a) Less because the kinetic energy of the skier increased as they descended down the kill in turn the potential energy dropped
sorry only have the a part
Explanation:
Using the formula T2=a3, What is the period of Neptune if the semi-major axis is 30.11?
A. 27000
b. 5.47
c. 3.10
D. 165
The period of Neptune is 165 years if the semi-major axis is 30.11 using the given formula.
Answer: Option D
Explanation:
The period of any planet revolutions around the sun can be determined using Kepler third law. As that law states that square to the period of one complete revolution of every planet is equal to cube of semi major axis of that planet. So the formula can be derived as
[tex]T^{2}=a^{3}[/tex]
Where T is the time taken for completing one revolution and a is the semi-major axis of the planet.
As here Neptune's semi major axis is given as 30.11. So the period of Neptune can be determined as follows:
[tex]T^{2}=(30.11)^{3}[/tex]
[tex]T^{2}=27,298[/tex]
Then take square root of this value:
[tex]T=\sqrt{27,298}[/tex]
T = 165 years
Thus, the Neptune takes 165 years for one complete revolution of the sun.
A satellite orbits the Earth at constant speed. Is this an unbalanced or balanced force?
Answer:
An unbalanced force is one that causes a change in the motion of the object to which the force is applied. An object at rest or an object in steady motion continues at rest or in unchanged motion unless it is subjected to an unbalanced force.
Balance forces are two forces acting in opposite directions on an object, and equal in size. Anytime there is a balanced force on an object, the object stays still or continues moving continues to move at the same speed and in the same direction.
Explanation:
A satellite orbiting Earth at constant speed would be considered an unbalanced force because it is an object in steady motion and it will remain in steady motion unless it is subjected to an unbalanced force.
Answer:
An unbalanced force is one that causes a change in the motion of the object to which the force is applied. An object at rest or an object in steady motion continues at rest or in unchanged motion unless it is subjected to an unbalanced force.
Explanation:
A student dropped some nails into a trash can half filled with wood shavings. Which way to seperate the mxture of nails and shavings?
A. Sifting
B. Flotation
C. Evaporation
D. Using Filter
Answer:
A. Sifting since the wood shavings are small enough to fall through the sift but nails are not.
From that particular list of choices, Flotation is the best. (B) Fill the trash can with water and stir it up. The nails will sink to the bottom, and the wood shavings will float on top, and you can skim them off.
But then what have you got ? You've got wet nails that'll rust if you don't dry them off in a hurry, and you've got a sticky wet pile of soggy wood shavings.
Can I suggest a better way to separate them ? Dump everything out on the ground, and pass a humongous magnet over it. The wood shavings will just lay there, but the nails will jump out and stick to the magnet. And everything will stay dry.
A baseball with a mass of 300 g has a kinetic energy of 304 J. Calculate the speed of the baseball
The formula for kinetic energy is equal to 1/2mv^2, where "m" is the mass of the object (in kilograms) and "v" is equal to the velocity of the object (in meters per second). To calculate the speed, simply plug in the values and solve.
KE = 0.5mv^2
304 J = 0.5(0.3 kg)v^2 -mass converted from grams to kilograms
v = 45.02 m/s
The baseball is travelling about 45.02 meters per second.
Hope this helps!
The speed of the baseball is 45.02 metres per seconds square.
Given the following data;
Mass = 300 grams Kinetic energy = 304 JoulesConversion:
1000 grams = 1 kilogram
300 grams = X kilograms
Cross-multiplying, we have;
X × [tex]1000[/tex] = [tex]300[/tex]
X = [tex]\frac{300}{1000} = 0.3[/tex] kilograms.
To find the speed of the baseball;
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex]K.E = \frac{1}{2}MV^2[/tex]
Where;
K.E represents kinetic energy measured in Joules. M represents mass measured in kilograms. V represents speed measured in metres per seconds square.Substituting the values into the formula, we have;
[tex]304 = \frac{1}{2}[/tex] × [tex]0.3[/tex] × [tex]V^{2}[/tex]
[tex]608 =[/tex] [tex]0.3[/tex] × [tex]V^{2}[/tex]
Dividing both sides by 0.3, we have;
[tex]V^{2} = \frac{608}{0.3}\\\\V^{2} = 2026.67[/tex]
Taking the square root of both sides, we have;
[tex]V = \sqrt{2026.67}[/tex]
V = 45.02 metres per seconds square.
Therefore, the speed of the baseball is 45.02 metres per seconds square.
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A power plant needs to slow down the fission reactions in its nuclear reactor. In which direction should the uranium-containing rods in the diagram be moved?
A)Left
B)right
C)up
D)down
Answer:
D. Down
Explanation:
The uranium-containing rods in the diagram should be moved down in order to slow down the fission reactions in its nuclear reactor.
What is nuclear fission?Nuclear fission is the process of splitting the nucleus of heavier atoms to produce two or more atoms of lighter nucleus with the release of large amounts of energy.
In order to slow down the fission reactions in its nuclear reactor, neutron absorbers are introduced and the uranium-containing rods are removed from the nuclear reactor.
Therefore, the uranium-containing rods in the diagram should be moved down in order to slow down the fission reactions in its nuclear reactor.
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Simple question please help! A ball is thrown 19.0 m/s at an angle of 40.0º with the horizontal. Assume the ball is thrown at ground level 22.0 meters away. a. How long does it take the ball to reach the wall? b. At what height does the ball hit the wall?
a. 1.51 s
In this part of the problem, we are only interested in the horizontal motion of the ball. Along the horizontal direction, the motion of the ball is a uniform motion with constant velocity, which is equal to the horizontal component of the initial velocity:
[tex]v_x = v_0 cos \theta = (19.0 m/s)(cos 40^{\circ})=14.6 m/s[/tex]
So, the ball travels horizontally at a speed of 14.6 m/s; in order to cover the distance of d = 22.0 m that separates it from the wall, the time need is
[tex]t=\frac{d}{v_x}=\frac{22.0 m}{14.6 m/s}=1.51 s[/tex]
b. 7.25 m
We now know that the ball takes 1.51 s to hit the wall, 22.0 away. Now we have to analyze the vertical motion of the ball, which is an accelerated motion with constant acceleration g =9.8 m/s^2 towards the ground (acceleration due to gravity).
The initial vertical velocity is
[tex]v_{y0}=v_0 sin \theta=(19.0 m/s)(sin 40^{\circ})=12.2 m/s[/tex]
The vertical position of the ball at time t is given by the equation
[tex]y(t)=v_{0y} t -\frac{1}{2}gt^2[/tex]
We know that the ball hits the wall at t=1.51 s, so if we substitute this value into the previous formula, we find at what height y the ball hits the wall:
[tex]y(1.51 s)=(12.2 m/s)(1.51 s)-\frac{1}{2}(9.8 m/s^2)(1.51 s)^2=7.25 m[/tex]
The joule is an example of units of work. Which of the following is not a valid unit of work? ft-lb (kg-m2)/s2 inch-ton lb/s2
The "lb/s² " is not a valid unit of work.
Each of the others is (a unit of force) x (a unit of distance) which is pretty much the definition of work.
The joule is the metric unit of measurement for work and energy, with 1 J = 1 N•m. Inch-ton is not a valid unit of work.
The joule is the metric unit of measurement for work and energy, where 1 J = 1 N•m. Work and energy share the same units in the SI system. In the context of this question, inch-ton is not a valid unit of work because it does not represent the correct combination of force and distance.
does anyone know this???
Answer:
C
Explanation:
The more ______ an object moves, the more __________ it has (Kinetic Energy)
Answer:
__________
Explanation:
A parallel circuit has a total current of 4 Amperes and an equivalent resistance of .5 Ohms. What is the power in this circuit?
Answer:
=8.0 Watts
Explanation:
Power is a ratio of work done over time. The power in an electric circuit is calculated using the following formula:
P=I²R
P is power, I is current, R is resistance
Therefore, Power= 4²ₓ 0.5Ω
=8.0 Watts
The power in the parallel circuit is 8 W.
Explanation:
Power in an electric circuit is defined as the current generated for a given amount of input voltage. So power of an electric circuit is directly proportional to the product of current and voltage in the circuit. The mathematical representation is
[tex]\text { Power }=\text { Current } \times \text { voltage }[/tex]
As per Ohm’s law, the current flowing in a closed circuit is directly proportional to the voltage applied to the circuit and resistance is the constant of proportionality between them. So
[tex]\text { Current } \propto \text { voltage }[/tex]
[tex]\text {Voltage}=\text {Current} \times \text {Resistance}[/tex]
Thus the formula for power in terms of resistance will look like
[tex]\text { Power }=\text { Current } \times \text { current } \times \text { resistance }=(\text { Current })^{2} \times \text { Resistance }[/tex]
As it is given that the net current in the parallel circuit is 4 A and equivalent resistance of the parallel circuit is given as 0.5 ohms. Then power is
[tex]\text { Power }=4 \times 4 \times 0.5 = 8 W[/tex]
Thus, the power in the parallel circuit is 8 W.
Unlike velocity, speed is scalar, which means it is described by only.
There are two qualities that can describe most variables - direction and magnitude. A vector possesses both a direction and magnitude, while a scalar possesses only a magnitude.
Hope this helps!
Answer:
It can be described on by its magnitude
MAGNITUDE
Explanation:
Vector quantities are described by their magnitude and their direction both
so all vector quantities like velocity etc need direction and magnitude both like velocity is given as 60 km/h towards North direction
But for scalar quantities we defined them only by their magnitudes
Like here if we define mass then we do not require any direction for its complete explanation.
so here correct answer will be
MAGNITUDE
Which of the following is true?
A.
Plants and animals are both autotrophs.
B.
Plants are heterotrophs, and animals are autotrophs.
C.
Plants and animals are both heterotrophs.
D.
Plants are autotrophs, and animals are heterotrophsWhich of the following is true?
A.
Plants and animals are both autotrophs.
B.
Plants are heterotrophs, and animals are autotrophs.
C.
Plants and animals are both heterotrophs.
D.
Plants are autotrophs, and animals are heterotrophs
Answer:
D. Plants are autotrophs and animals are heterotrophs
Explanation:
Plants are autotrophs because they make their own food through photosynthesis
Animals have to consume other animals or plants as food and can't make food on their own, so they are heterotrophs
Answer:
D. Plants are autotrophs and animals are heterotrophs
Explanation:
a rock dropped on the moon will increases its speed from 0 m/s (its starting speed when first dropped) to 4.9 m/s in about 3 seconds. What value do your calculate for the magnitude of the acceleration of gravity on the moon?
Answer:
a = 1.63 m/s²
Explanation:
Given in the question that,
initial speed of the rock = u = 0 m/s
final speed of the rock = v = 4.9 m/ s
time taken = t = 3 sec
We will use Newton's law of motion
Formula to use to calculate the acceleration of gravity on moon
v - u = a(t)4.9 - 0 = a(3)
4.9 = a(3)
a = 4.9/3
a = 1.63 m/s²
Heat transfer from the Sun to the Moon is mostly through the process of *
Radiation
Radioactivity
Conduction
Refraction
Convection
radiation since the suns rays are ultraviolet which is a form of radiation
Heat transfer from the Sun to the Moon is mostly through the process of Radiation.
Explanation:
In space, the heat is being transferred through the process of radiation. There is no atmosphere in the moon so it will get heat or cool by the process of conduction or convection.
In space, heat gets transferred by radiation which mainly takes place in the infrared band of electromagnetic waves. Radiation can transmit heat by the electromagnetic wave. It can take the heat transfer process in the vacuum.
is a brick an alloy or ceramic
Answer:
Its a ceramic
Explanation:
Brick does not contain any metal so it couldnt be an alloy.
Answer:
Brick is a ceramic
Explanation:
Alloy is a metal made up by combining two or more metallic elements. for example, bronze is made up by alloying tin with copper. Ceramic materials is an inorganic,non metallic which is often crystalline oxide,nitride or carbide material. For example, Tiles are made up of natural clay sand and water.
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