The energy, E of the given waves are as follows:
a. Energy, E = 6.63 * 10⁻²⁸ J
b. Energy, E = 6.63 * 10⁻²⁴ J
c. Energy, E = 1.99 * 10⁻¹⁶ J
d. Energy, E = 4.97 * 10⁻¹⁹ J
e. Energy, E = 2.84 * 10⁻¹⁹J
f. Energy, E = 1.99 * 10⁻¹⁶ J
What is the formula to calculate the energy of a wave?The formula to calculate the energy of a wave s given below as follows:
Energy, E = hc / λwhere;
h is Planck's constant = 6.63 * 10⁻³⁴ Js
c is the velocity of light = 3.0 * 10⁸ m/s
λ is the wavelength of the light
The energies of the waves are calculated as follows:
a. λ = 3.0 x 10¹¹ nm or 3.0 * 10² m
E = 6.63 * 10⁻³⁴ * 3.0 * 10⁸ / 3.0 * 10²
E = 6.63 * 10⁻²⁸ J
b. λ = 3.0 x 10⁷ nm or 3.0 x 10⁻² m
E = 6.63 * 10⁻³⁴ * 3.0 * 10⁸ / 3.0 * 10⁻²
E = 6.63 * 10⁻²⁴ J
c. λ = 1 nm or 1.0 x 10⁻⁹ m
E = 6.63 * 10⁻³⁴ * 3.0 * 10⁸ / 1.0 x 10⁻⁹ m
E = 1.99 * 10⁻¹⁶ J
d. λ = 400 nm or 4.0 x 10⁻⁷ m
E = 6.63 * 10⁻³⁴ * 3.0 * 10⁸ / 4.0 x 10⁻⁷ m
E = 4.97 * 10⁻¹⁹ J
e. λ = 700 nm or 7.0 x 10⁻⁷ m
E = 6.63 * 10⁻³⁴ * 3.0 * 10⁸ / 7.0 x 10⁻⁷ m
E = 2.84 * 10⁻¹⁹J
f. λ = 1 nm or 1.0 x 10⁻⁹ m
E = 6.63 * 10⁻³⁴ * 3.0 * 10⁸ / 1.0 x 10⁻⁹ m
E = 1.99 * 10⁻¹⁶ J
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An astronauts suit is heated through which method?
A. Conduction
B. Convection
C. Radiation
Radiation is correct answer.
What is radiation?
Radiation is energy that moves through space at the speed of light from a source. This energy is coupled with an electric and magnetic field, and it has wave-like qualities. Radiation is sometimes known as "electromagnetic waves."
UV rays, which can be fatal, are readily avoided by covering oneself. The visors are coated to reflect UV, while the suit's opaque layers take care of the rest. On the other end of the spectrum, x rays and gamma rays are difficult to shield—here is where lead comes in, but there isn't enough of this type of radiation to justify the added weight. A radiologist's lead apron can weigh 10-15 kg, so filling the entire suit with this thickness of lead would add at least 25-40 kg to an already large and heavy suit. The material of the suit absorbs some of the radiation, although this is not the greatest danger to astronauts.
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At some point during construction, the International Space Station had a
mass of 235,565 kg. When it orbited the Earth at an altitude of 400,000 m,
what was the approximate gravitational force on the Station due to Earth's
gravity? (Recall that Earth has a radius of 6.37 x 106 m, it has a mass of 5.97
x 1024 kg, and G = 6.67 x 10-11 N•m²/kg².)
The gravitational force exerted on the Station by the gravity of the Earth is approximately 0.00026680N.
Give an example to define gravitational force.The gravitational force is the force that the earth exerts on a body to attract it. Examples of motion caused by gravitational force include the downward motion of water in rivers and streams, the upward motion of thrown objects such as balls, and the downward motion of the leaves and fruits of trees as they fall to the earth.
Where is gravity located?All objects with mass are attracted to one another by the gravitational attraction, which has a magnitude that is directly proportional towards the masses of the two objects & directly proportional to the distance of their distance from one another gravitational force
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A 487 kg bear grasping a vertical tree slides
down at constant velocity.
The acceleration of gravity is 10 m/s².
What is the friction force that acts on the
bear?
Answer in units of N.
Answer:
4870 N
Explanation:
Since he is not accelerating
the force is equal to his weight mg = 487 * 10 = 4870 N
In the district soccer championship finals, Elizabeth kicks a 0.94 kg soccer ball with a force of 35.0 N. How much does she accelerate the soccer ball from rest in the process?
Taking into account the Newton's Second Law, she accelerate the soccer ball from rest to 37.234 m/s² in the process.
Newton's second lawNewton's Second Law states that this force will change the speed of an object because the speed and/or direction will change.
Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object.
Mathematically, Newton's second law is expressed as:
F= m×a
where:
F = Force [N]m = Mass [kg]a = Acceleration [m/s²]Gravitational force be on the MoonIn this case, you know:
F= 35 Nm= 0.94 kga= ?Replacing in Newton's second law:
35 N= 0.94 kg× a
Solving:
a= 35 N÷ 0.94 kg
a=37.234 m/s²
Finally, she accelerate the soccer ball to 37.234 m/s².
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A cap 6.000 cm in diameter plugs an opening in a spherical container 1.000 m in diameter at atmospheric pressure. The container is submerged to a depth of 10.00 ft in water. Assume the plug is planar and the pressure over the container is equalized. The force needed to remove the plug is closest to?
The force needed to remove the plug that is 6.000 cm in diameter which plugs an opening in a spherical container 1.000 m in diameter at atmospheric pressure is 85 N
P = F / A
P = ρ g h
P = Pressure
F = Force
A = Area
ρ = Density
g = Acceleration due to gravity
h = Height
ρ = 1000 kg / m³
g = 9.8 m / s²
h = 10 ft = 3.048 m
A = π r²
d = 6 cm = 0.06 m
r = d / 2 = 0.06 / 2
r = 0.03 m
A = 3.14 * 0.03 * 0.03
A = 0.002826 m²
Equating both formulae of P,
F / A = ρ g h
F = 1000 * 9.8 * 3.048 * 0.002826
F = 85 N
Therefore, the force needed to remove the plug is closest to 85 N
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How might these traits change from individual to individual? (Hint: Do you think the newts are all exactly the same color or size?)
Newts hatch in water, but they spend the most of their lives on land, returning to water only for mating.
They have rough skin, are 8 inches long, and have stubby legs and fangs. In the Pacific Northwest, some of them are toxic.
Rough-skinned newts have brown skin on their backs and bright orange skin on their bellies. When frightened by predators, these newts coil their bodies and show off their orange necks and tails. Predators are warned to stay clear from this orange tint.
It is to be noted that none of the newts are the same traits that is color or size.
What are traits?A phenotypic trait (simply trait or character state) is a distinct variety of an organism's feature that is visible and quantifiable and manifests itself in an observable manner.
For example, eye color (green, blue, brown, and hazel) is a phenotypic feature that is passed down by polygenetic inheritance.
Height, wing length, and hair color are all phenotypes. Phenotypes also include observable traits that may be evaluated in the lab, such as hormone levels or blood cell counts.
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Why does a power plant generator produce alternating current and not direct
current?
A power plant generator does easily generate alternating current and not direct
current simply because the AC current is far cheaper to produce.
Why is a power plant generator cheaper to generate alternating current?The simple reason why a power plant generator generate an alternating current cheaply is because the plant loses a very few energy when electricity is being transmitted with it through a long distance. Whereas, the direct current usually, frequently and most of the time loses more energy.
So therefore, we can now deduce from above that it is easy to generate alternating current from a power plant.
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What do astronomers refer to as the retrograde motion of the planets? A. apparent movement of the planets eastward in a single night B. apparent movement of the planets westward in a single night C. apparent movement of the planets eastward from night to night D. apparent movement of the planets westward from night to night
Astronomers refer to as retrograde motion of the planets to an apparent movement of the planets westward from night to night.
What is a retrograde motion?The retrograde movement or the retrogradation of the planets is the apparent movement that a planet makes in the opposite direction to the other bodies that make up the system where it is.
This movement is actually an optical illusion that occurs due to the difference in speed between the different planets, looking as if one of them were moving backwards from east to west.
Therefore, we can confirm that the correct answer is option D. apparent movement of the planets westward from night to night.
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White's style is directed at all but one of the following. Which one?
White's narrative approach encourages families to option a. create alternative accounts of their lives.
What is the narrative therapy approach?A type of therapy called narrative therapy seeks to detach the patient from the issue, allowing them to externalize their problems rather than keep them inside. It depends on the person's own abilities and sense of purpose to get them through challenging situations.
Note that Writing or reading stories with problems and answers related to the person's circumstances might be part of a narrative approach. The goal of narrative techniques is to give children a different means of expressing their feelings through words.
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See full question below
White's narrative approach encourages families to:
a. create alternative accounts of their lives
b. gain awareness of the origins of their problem
c. attend to reflecting team observations
d. develop a problem-saturated perspective
What has to happen with the time to have the smallest force to stop a moving body.
Answer:
You can only stop (or start) your body moving through space if you can cause an external force to be applied to it.
Explanation:
You are given 13.0 m of thin wire. You form the wire into a circular coil with 70 turns.
If this coil is placed with its axis parallel to a 0.19 T magnetic field, what is the flux through the coil?
The magnetic flux through the coil is determined as 25.2 Tm².
What is the magnetic flux through the coil?
Magnetic flux is defined as the number of magnetic field lines passing through a given closed surface.
The magnetic flux through the coil is calculated using the following formula.
Ф = BA cosθ
where;
B is the magnetic field strengthA is the area of the coilθ is the inclination of the coilA = πd²/4
where;
d is the diameter of the wireA = π(13)²/4
A = 132.73 m²
Since the coil is parallel to the magnetic field, θ = 0
Ф = BA cosθ
Ф = 0.19 T x 132.73 m² x cos(0)
Ф = 25.2 Tm²
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Find the resultant force of 16N and the force of 25N acting at the same point on an object if the Force at : (1) In the same direction in the same line. (11) In the opposite direction but in the same straight line. (111) At right angles to each other.
1 ) Resultant force if the forces act in the same direction = 41 N
2 ) Resultant force if the forces act in the opposite direction = 9 N
3 ) Resultant force if the forces act at right angles to each other = 29.68 N
F1 = 16 N
F2 = 25 N
1 ) If the forces act in the same direction,
F = F1 + F2
F = 16 + 25
F = 41 N
2 ) If the forces act in the opposite direction,
F = F2 - F1
F = 25 - 16
F = 9 N
3 ) If the forces act at right angles to each other,
F² = F1² + F2²
F² = 16² + 25²
F² = 256 + 625
F² = 881
F = 29.68 N
Therefore,
1 ) F = 41 N
2 ) F = 9 N
3 ) F = 29.68 N
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A projectile is fired horizontally at 180 m/sec from an altitude of 734.7 m. What is the final vertical velocity of the projectile as it hits the ground?
A projectile is fired horizontally at 180 m/sec from an altitude of 734.7 m. The final vertical velocity of the projectile as it hits the ground will be 216.36 m/s
s = u*t + 1/2 * a * [tex]t^{2}[/tex]
734.7 = 180 * t + 1/2 * g * [tex]t^{2}[/tex]
734.7 = 180 * t + 1/2 * 9.8 * [tex]t^{2}[/tex]
= 4.9 [tex]t^{2}[/tex] + 180 t - 734.7
by solving the above quadratic equation , we get
t = 3.71 seconds
v = u + at
v = u + g*t
v = 180 + (9.8)(3.71)
= 216.36 m/s
The final vertical velocity of the projectile as it hits the ground will be 216.36 m/s
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Which direction do the electrons move when the south end of the magnet goes through the coil?
Electrons will move in anti- clockwise direction in the coil when the south end of the magnet goes through the coil
If you flip the magnet to bring its south pole towards the coil, the current flows in the direction that produces a magnetic field whose south pole faces the magnet . And as we know that , in south pole of the coil , the current will move in clockwise direction . Hence , electrons will move in anticlockwise direction because electrons move in opposite direction of the current .
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The electricity produced either by varying the magnetic field through a mechanical movement of the magnet or by rotating or moving the loop within a fixed magnetic field that does not move in both cases the magnetic flux through the loop varies with time? Explain your answer.
The electricity produced either by varying the magnetic field through a mechanical movement of the magnet or by rotating or moving the loop within a fixed magnetic field that does not move in both cases the magnetic flux through the loop varies with time.
What is magnetic field?The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field.
A current will be induced in a coil of wire if it is exposed to a shifting magnetic field. Because of an electric field that is being generated, which drives the charges to move around the wire, current is flowing.
The electricity produced either by varying the magnetic field through a mechanical movement of the magnet or by rotating or moving the loop within a fixed magnetic field that does not move in both cases the magnetic flux through the loop varies with time.
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5. A force of 3.5 N applied to an object for 0.15 seconds increases the object's velocity by 2.0 m/s. What is the
mass of the object?
The estimated value of mass is 0.2625066 units
Given , Force =3.5N , time=0.15sec =15/100 sec
Velocity=2 m/s, mass =?
In Physics Acceleration means rate of change of velocity, i.e. Mathematically, a= v/t
a= 2/0.15
a=200/15= 13.333m/s²
In Physics Force means product of mass and acceleration i.e. F=ma
From this equation we can deduce the value of mass of the object.
3.5N= m [13.333]
m=3.5/13.333
m= 0.2625066
Hence forth in this way the value of mass is computed.
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To cool 350 mL of coffee at 90 ∘C to 0 ∘C , what is the minimum mass of 0 ∘C ice required?
Ice at 0°C must have a minimum mass of 0.39 kg.
As we know that
M(ice) at Ti(ice) = 0°C
Mс = 350 ml at Tic = 90°C
Now,
The heat loss by coffee=heat gain by ice
So,
McScΔ₁ = M₁L₁
Then,
ρv = 10³×(350×10-³)×10-³ = 350g
The specific heat of coffee = 1 cal/9°C
The latent heat of ice = 80 cal/g
Now, we plug all the values in above formula
350×1×(90-0) - M₁x80
M₁ = [tex]\frac{350x90}{80}[/tex]
=393.75g
=0.393kg
The minimum mass of 0°C ice required is 0.393 kilograms
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A tank with a flat bottom is filled with water to a height of 7.5 meters. What's the pressure at any point at the bottom of the tank?
A tank with a flat bottom is filled with water to a height of 7.5 meters. The pressure at any point at the bottom of the tank will be 174825 Pascal
Pressure at the flat bottom will be = Po + P(h)
Po = atmospheric pressure
P(h) = Pressure due to water
density of water = rho = 1000 kg / [tex]m^{3}[/tex]
Pressure at the flat bottom will be = 101325 Pa + 1000 * 9.8 * 7.5 = 174825 Pascal
The pressure at any point at the bottom of the tank will be 174825 Pascal
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Which of the following has thermal energy? A. Both a piece of metal that feels hot and a piece of metal that feels cold B. A piece of metal that feels hot but not a piece of metal that feels cold C. A piece of metal that feels cold but not a piece of metal that feels hot D. Neither a piece of metal that feels hot nor a piece of metal that feels cold
Answer:
B
Explanation:
If you try the experiment yourself, You will see that a hot piece of metal has and sustains that thermal energy until that piece of metal eventually cools off.
On the other hand, it takes a while for the cold piece of metal to heat up. So, therefore, it does not contain thermal energy for that long period until it is thoroughly heated up.
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A 1-column table. The first column labeled properties of mixtures has entries has no set composition, must have more than one state of matter, must have more than one substance.
What mistake did Dominic make?
The title should read “Properties of Solutions” because some mixtures do not have all of the properties listed.
There is a definite recipe to make each mixture, so the composition of a mixture is set.
Although it is possible to have more than one state, it is also possible to have only one state.
A single substance can be used to make a mixture if the substance is composed of more than one element.
The mistake that Dominic made in the above prompt is: "Although it is possible to have more than one state in mixtures, it is also possible to have only one state." (Option C).
What is a mixture?A mixture is a material composed of two or more separate chemical components that are not chemically linked. A mixture is the physical combination of two or more substances that retain their identities and are blended in the form of solutions, suspensions, and colloids.
Mixtures are classified into two types: heterogeneous and homogeneous. Heterogeneous mixes feature distinct components, whereas homogeneous mixtures look uniform throughout. A solution, which can be solid, liquid, or gas, is the most frequent form of homogeneous combination.
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Pls draw me what a velocity time graph would look like : moving at a positive constant speed to then at rest? Thank you!!!
Answer:
See below
Explanation:
Here are a couple of options..... one where the object slows to a rest and the other where the object stops to a rest instantaneously
In the winter, an animals fur provides warmth through which method?
A. Conduction
B. Convection
C. Radiation
In the winter, an animals fur provides warmth through Conduction.
What is conduction?
One of the three main ways that heat energy moves from one place to another is conduction. The other two ways heat moves are through radiation and convection. Thermal energy is transferred through conduction when nearby atoms or molecules collide. Because the particles in solids and liquids are closer together than they are in gases, conduction occurs more readily. The rate of energy transfer besides conduction is faster when there is a significant temperature difference between the materials in contact. Thermal energy is transferred from a lower kinetic energy area to a higher kinetic energy area. The kinetic energy of slow-moving particles increases when they collide with fast-moving particles. This is a typical instance of heat transfer through physical contact.
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A person is falling from the top of a building. If they hit the ground they will die. A superhero swoops in from the side at high speed and catches them just before they reach the ground. The person is saved from harm.
Why does this defy physics? Give Equations/Laws to justify your answer.
This situation defies the laws of physics because the force required to stop the person from touching the ground would be too great that it would be equally fatal.
What laws should be considered in this situation?The first law to be considered is that an object will continue moving at a constant acceleration unless there is an unbalanced force that interrupts this. In other words the person will fall unless the supehero force is equally strong to the accelaration.
What is the problem with this?The main problem is that the superhero's speed and force would have to be about 160 miles per hour or even more to "save" the person. However, this would be even more dangerous than being hitted by a car and the person would immediately die due to the impact.
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Which of the following courses might a mechanical engineer take in college?
Agriculture Operations
Organic Chemistry
Ethics in Sustainable Agriculture
Molecular Biology
The course to be likely taken by a mechanical engineer in college is agriculture operations (option A).
What is engineering?Engineering is application of mathematics and the physical sciences to the needs of humanity and the development of technology.
Mechanical engineering is a subfield of engineering concerned with designing and building machines and mechanical systems.
A mechanical engineer is an individual who specialises in the field of mechanical engineering. This means that a mechanical engineer is expected to be vast in the knowledge of designing and building machines for operations in other fields.
One of those fields that a mechanical engineer can build or design machine for is agriculture. Therefore, agriculture operations is the most likely course to be taken by a mechanical engineer in college.
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Answer: The correct answer is Agriculture Operations
Explanation: This answer has been confirmed correct.
Mechanical engineers work with equipment and automation, in areas such as agricultural operations. In contrast, they do not typically work with chemistry, ethics, or molecular biology.
Water drips from rest from a leaf that is 12.0 meters above the ground. Neglecting air
resistance, how long does it take the water drop to hit the ground? What is the speed of
each water drop when it hits the ground?
Speed of the drop will be 15.4919m/s
Given :- g =10m/s²
u=0
s=12
v²-u²=2as is the formula to be used.
v²=u²+2as
v²=2 x 10 x 12
=240
v=√240 m/s
=15.4919m/s
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Mendeleev arranged elements in order for increasing?
Answer: Relative Atomic Mass
Explanation: The closer the element is to the bottom-right corner, the higher the relative atomic mass. Hydrogen has the lowest relative atomic number at 1, whereas Lawrencium has the highest relative atomic mass at 262.
can someone pls help me
Answer:
The first one is the right answer
Explanation:
This is because a period is only completed when there is the completion of only one oscillation
A particle moving uniformly along a curved path has a period of 0.24 s and a speed of 4.2 m/s. The radius of the path is?
a. 16 cm
b. 2.6 cm
c. 1.0 m
d. 0.062 cm
We obtain the radius of the curved path through which the ball travels as 16 cm. Option A
What is the radius of the path?We know that we can be able to obtain the radius of the path from the period of the path and the velocity of the object by the use of the equation;
V = 2πr/T
Given that;
V = velocity
T = period
r = radius
VT = 2πr
r = VT/2π
r = 4.2 m/s * 0.24 s/ 2 * 3.142
r = 1.008/6.284
r = 0.16 m or 16 cm
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Think about a demonstration with a can of compressed gas. The can weighed less after some gas was shot out of the can. How does this show that gas is matter?
The gas is a matter as it has mass and occupies space which is evident from the fact that it weighed less.
Anything that occupies space and has mass is matter.
When the gas was shot out of the can, the can weighed less. This simply means that gas has mass.
Since the gas has mass and does occupy space, so, this shows that gas is matter.
Everything around is made up of matter. There are different types of matter like solids, liquids, and gas. These three are the primary forms of matter. Two other forms are also discovered which are Plasma and Bose-Einstein Condensate.
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How much tension must a cable withstand if it is used to accelerate a 1800- kg car vertically upward at 0.60 m/s2
Answer:
Approximately [tex]1.9\times 10^{4}\; {\rm N}[/tex] (rounded up) assuming that [tex]g = (-9.81)\; {\rm N \cdot kg^{-1}}[/tex] (downwards.)
Explanation:
The car is accelerating at a constant [tex]a = 0.60\; {\rm m\cdot s^{-2}}[/tex] (positive since the car is accelerating upwards.) Hence, the net force on this car will be:
[tex]\begin{aligned}F_{\text{net}} &= m\, a \\ &= 1800\; {\rm kg} \times 0.60\; {\rm m\cdot s^{-2}} \\ &= 1080\; {\rm N}\end{aligned}[/tex].
Note that since net force points in the same direction as acceleration (upwards,) [tex]F_{\text{net}}[/tex] is also positive.
The main forces on this car are:
Weight (downward).Tension from the cable (upward): [tex]F(\text{tension})[/tex].With a mass of [tex]m = 1800\; {\rm kg}[/tex], the weight on this car will be [tex]m\, g = 1800\; {\rm kg} \times (-9.81)\; {\rm N \cdot kg} = (-17658)\; {\rm N}[/tex] (negative since weight points downwards to the ground.)
The net force on this car is the sum of the external forces:
[tex]F_{\text{net}} = F(\text{tension}) + m\, g[/tex].
It is shown that [tex]F_{\text{net}} = 1080\; {\rm N}[/tex] while [tex]m\, g = (-17658)\; {\rm N}[/tex]. Substitute both values into the equation and solve for [tex]F(\text{tension})[/tex]:
[tex]1080\; {\rm N} = F(\text{tension}) + (-17658)\; {\rm N}[/tex].
[tex]\begin{aligned}F(\text{tension}) &= 1080\; {\rm N} + 17658\; {\rm N} \approx 1.9\times 10^{4}\; {\rm N} \end{aligned}[/tex] (rounded up.)