This question is not complete, the complete question is;
Amateur radio operators in the United States can transmit on several bands. One of those bands consists of radio waves with a wavelength near 20 m . Calculate the frequency of these radio waves.
Answer: frequency of the radio waves is 15 MHz
Explanation:
Given that;
wavelength λ = 20 m
we know that; Speed of light C = 3 × 10⁸ m/s
frequency f = ?
we know that;
frequency f = Speed of light C / wavelength λ
so we substitute
frequency f = (3 × 10⁸m/s) / (20m)
frequency f = 15 × 10⁶ Hz
we also know that 1 Hertz = 0.000001 Megahertz
so
frequency f = 15 × 10⁶ Hz × 0.000001
frequency f = 15 MHz
Therefore frequency of the radio waves is 15 MHz
Imagine you are ice skating with your BFF. Both of you are at rest in the middle of the ice, when you shove your BFF away from you. You have a mass of 70 kg and your BFF has a mass of 60kg. When you shove off, you are moving with a velocity of 2.5 m/s.
What should the total net momentum be after the push?
Answer:
The total net momentum after the push is 0.
Explanation:
The total net momentum is given by:
[tex] p_{f} = p_{1_{f}} + p_{2_{f}} = m_{1}v_{1} + m_{2}v_{2} [/tex]
Where:
m₁: is the mass of 70 kg
m₂: is the mass of 60 kg
v₁: is the speed of 2.5 m/s
v₂:?
To find the final momentum first we need to find the speed v₂:
[tex]m_{1}v_{1} + m_{2}v_{2} = p_{i}[/tex]
Where [tex]p_{i}[/tex] is the initial momentum = 0 (they are at rest)
[tex] v_{2} = -\frac{m_{1}v_{1}}{m_{2}} = -\frac{70 kg*2.5 m/s}{60 kg} = -2.92 m/s [/tex]
The minus sign is because the second person is moving in the opposite direction to the first person.
Now, the total net momentum is:
[tex] p_{f} = m_{1}v_{1} + m_{2}v_{2} = 70 kg*2.5 m/s + 60 kg*(-2.92 m/s) = 0 [/tex]
The final total momentum (after the push) should be zero because of momentum conservation.
Therefore, the total net momentum after the push is 0.
I hope it helps you!
what is work? how do we solve for work?
Answer: Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton • meter (N • m). One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m.
Explanation:
Answer:Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton • meter (N • m). One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m.
Explanation:
an impulse is a force acting over some amount of time to cause a change in momentum. on the other hand, work is a
Answer:
force; distance; energy.
Explanation:
An impulse can be defined as the net force acting an object for a very short period of time.
Mathematically, impulse is given by the formula;
[tex] Impulse = force * time[/tex]
An impulse is a force acting over some amount of time to cause a change in momentum. On the other hand, work is a force acting over some amount of distance to cause a change in energy.
Mathematically, work done is given by the formula;
[tex] Work done = force * distance [/tex]
Ignoring mass and weight contributed by fuel, what happens when the space shuttle takes off and moves away from earth?
Answer:
Its mass increases and weight decreases. Its mass remains constant and weight decreases.
Assess It! Question #2: Which of the following statements about the Law
of Acceleration is true?
5 points
A: Increasing an object's mass decreases the amount of force required to move it
B: Decreasing the mass of an object increases its acceleration while force is
constant
C: Increasing the force applied to an object does not change its acceleration while
mass is constant
D: Decreasing the force applied to an object increases its acceleration while mass is
constant
Answer:
Statement B is the only true statement
"Decreasing the mass of an object increases its acceleration while force is constant."
Explanation:
Recall that Newton's 2nd Law states:
F = m * a
Therefore, if the force (F) is constant, and the mass (m) decreases, the acceleration (a) of the object must increase.
This agrees with the statement labeled as B: "Decreasing the mass of an object increases its acceleration while force is constant."
The true statement about the law of acceleration is that decreasing the mass of an object increases its acceleration while force is constant.
NEWTON'S LAW:
The relationship between the force, mass and acceleration has been explained by Newton in his law. The equation is as follows:Force = mass × accelerationAccording to the equation, the mass is inversely proportional to the acceleration. This means that as the mass increases, the acceleration decreases and vice versa. Therefore, the true statement about the law of acceleration is that decreasing the mass of an object increases its acceleration while force is constant.Learn more at: https://brainly.com/question/25116504?referrer=searchResults
In the first 2 seconds of a race, an athlete accelerates constantly from 0 m/s and reaches a
speed of 9 m/s.
Calculate the acceleration of the athlete. You do not need to state the unit here.
Given :
Initial speed, u = 0 m/s.
Final speed, v = 9 m/s.
Time taken to reach that speed, t = 2 sec.
To Find :
The acceleration of the athlete.
Solution :
We know, in uniform acceleration motion :
[tex]v= u+at\\\\a = \dfrac{v-u}{t}\\\\a = \dfrac{9-0}{2}\ m/s\\\\a = 4.5 \ m/s^2[/tex]
Therefore, acceleration of the athlete is 4.5 m/s².
A bat with a force of 50 N hits a softball with a mass of 0.5 kg. What will the softball's acceleration rate be?
Answer:
100m/s²
Explanation:
F=ma
50=0.5a
a=50/0.5
a=100
Yeah, so, my teacher finna kill me if I don't turn this in today..
The Fnet = m • a equation is often used in algebraic problem solving. The table below can be filled by substituting into the equation and solving for the unknown quantity. Try it yourself and then use the click on the buttons to view the answers. To get a (acceleration) by itself, you must divide net Force by mass.
Answer:
Blank 1: 10
Blank 2: 4
Blank 3: 10
Blank 4: 5
Blank 5: 5
Assume that, as the battery wears out, the voltage decreases at 0.03 volts per second and, as the resistor heats up, the resistance is increasing at 0.02 ohms per second. When the resistance is 100 ohms and the current is 0.02 amperes, at what rate is the current changing
Answer:
[tex]\frac{dI}{dt} =-3*10^-^4amps/sec[/tex]
Explanation:
From the question we are told that
Voltage decreases at [tex]\frac{dv}{dt} =-0.03volts/sec[/tex]
Resistance increase at [tex]\frac{dR}{dt}=0.02ohms /sec[/tex]
Resistance at [tex]R=100ohms[/tex]
Current at [tex]I=0.02amps[/tex]
Generally the equation for ohms law is mathematically represented as
[tex]V=IR[/tex]
Therefore
[tex]\frac{dV}{dt} =R\frac{dI}{dt} +I\frac{dR}{dt}[/tex]
Generally making [tex]\frac{dI}{dt}[/tex] subject of the formula in the above equation mathematically gives
[tex]\frac{dV}{dt} =R\frac{dI}{dt} +I\frac{dR}{dt}[/tex]
[tex]R\frac{dI}{dt} = \frac{dV}{dt} -I\frac{dR}{dt}[/tex]
[tex]\frac{dI}{dt} =\frac{1}{R} (\frac{dV}{dt} -I\frac{dR}{dt})[/tex]
Therefore
[tex]\frac{dI}{dt} =\frac{1}{100}((-0.03) -(0.02)*(0.02))[/tex]
Generally it is given that the change in current is
[tex]\frac{dI}{dt} =-3*10^-^4amps/sec[/tex]
Two rope tows operate on the same ski slope. Tow A with a heavier load pulls as fast as Tow B. Which does the most work? Which has the most power?
Answer:
tow a has the most power but tow b does the most work
Explanation:
Tow A with a heavier load pulls as fast as Tow B, Then A does The most work, and A also has more power.
What is power?It is defined as the Rate of work done or the ratio of work done and time.
If the amount of work(W) is down over a time interval of (t) then the power is given by,
P=W/t
Where W=is work done by a force is known as a product of force and distance.
t= time interval in s.
Force
F= force which is known as the rate of momentum.=mv/t
where m= mass of the body in kg.
v= velocity in m/s.
Here in the question, given that A pulls heavier weight than B that means A applied more force which results in more work.
When more work is done by A than by B then the power of an also greater than B because they move at the same velocity.
Hence, The Work done as well as the power of A is more.
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Need help fast pls thanks
Answer:
We need the question
Explanation:
The answer is the first choice.
a small glass or plastic tube that contains a piece of wire is called a circuit breaker
T or F?
Answer:
False, it is a fuse.
Explanation:
In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current. It is a sacrificial device; once a fuse has operated it is an open circuit, and must be replaced or rewired, depending on its type.
Fuses have been used as essential safety devices from the early days of electrical engineering. Today there are thousands of different fuse designs which have specific current and voltage ratings, breaking capacity and response times, depending on the application. The time and current operating characteristics of fuses are chosen to provide adequate protection without needless interruption. Wiring regulations usually define a maximum fuse current rating for particular circuits. Short circuits, overloading, mismatched loads, or device failure are the prime or some of the reasons for fuse operation.
A fuse is an automatic means of removing power from a faulty system; often abbreviated to ADS (Automatic Disconnection of Supply). Circuit breakers can be used as an alternative to fuses, but have significantly different characteristics.
Source: https://en.wikipedia.org/wiki/Fuse_(electrical)
A fuse is a small glass or plastic tube that contains a piece of wire. That wire is carefully calibrated so that it will only allow a certain level of current to pass through it. Any more, and the wire will melt from the heat, breaking the circuit. This means that if a power surge comes into your home, a circuit will be broken before it causes damage to your appliances.
A circuit breaker achieves the same thing, but by a different method. A circuit breaker also disconnects the circuits in your home if the current gets too large but does it using electromagnets. If the current gets high enough, then the electromagnet will become powerful enough to attract a contact and break the circuit that way.
Both circuit breakers and fuses can be used to help with another situation. If you have an appliance with a metal case and that appliance comes in contact with a live wire, it can cause you to electrocute yourself. But if that metal case is connected to a ground wire (the third pin in some plugs), then the electricity will flow through the ground wire, through the circuit breaker or fuse box, and break the circuit, stopping you from potentially getting electrocuted.
Source: https://study.com/academy/lesson/the-differences-between-fuses-circuit-breakers.html
Q2. Point D is located at 49.3 m above the ground. The speed of the roller
coaster at point D is 0.49 m/s. Find the speed of the roller coaster at A, B, C
and E, located at the following heights above the ground:
A - 12.4 m
B-3.2 m
C-41.8 m
E-35.3 m
A light wave travels from one medium into a second medium with a greater absolute index of refraction. Which characteristic of the wave can
Explanation:
With the change in medium the speed of light wave travel changes. Therefore, the absolute refractive index changes. The speed of light is maximum is vacuum and changes with the change in medium. This is the refractive indices of different medium are different.
The refractive index is the characteristic of the wave that can not change as the wave enters the second medium.
What is a refractive index?The refractive index of a substance also known as the refraction index or index of refraction is a dimensionless quantity that specifies how quickly light passes through it in optics.
When the refractive index of a substance is increased, the speed of light in the material decreases.
The speed at which light waves travel changes as the medium changes. The absolute refractive index changes.
As a result, the speed of light is greatest in a vacuum and decreases as the medium changes. This is due to the fact that the refractive indices of various media are different.
Hence the refractive index is the characteristic of the wave that can not change as the wave enters the second medium.
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On a sunny day, a family decided to take sail on a nearby lake. During sailing the wind applies a force of 25N north on the sails of the sailboat. The
water however exerts a force of 20 N east. If the total mass of both the sailboat and the crew (family on board) is 20kg, what is the magnutude and
direction of the acceleration produced?
Answer:
its n
Explanation:
The acceleration of the boat is obtained as 1.6 ms-2.
We have to obtain the resultant force acting on the boat in order to obtain the acceleration of the boat.
Resultant force on the boat = √(25)^2 + (20)^2 = √625 + 400 = 32 N
Now recall that from Newton's laws; F = ma
m= mass of the body
a = acceleration of the body
32 N = 20Kg × a
a = 32 N/20Kg
a = 1.6 ms-2
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Help please..................
Water falls without splashing at a rate of 0.200 L/s from a height of 3.60 m into a 0.730 kg bucket on a scale. If the bucket is originally empty, what does the scale read (in newtons) 3.20 s after water starts to accumulate in it
Answer:
15.106 N
Explanation:
From the given information,
The weight of the bucket can be calculated as:
[tex]W_b = m_bg = \\ \\ W_b = (0.730 \ kg) ( 9.80 \ m/s^2) \\ \\ W_b = 7.154 \ N[/tex]
The mass of the water accumulated in the bucket after 3.20s is:
[tex]m_w= (0.20 \ L/s) ( 3.20)s[/tex]
[tex]m _w=0.64 \ kg[/tex]
To determine the weight of the water accumulated in the bucket, we have:
[tex]W_w = m_w g[/tex]
[tex]W_w = ( 0.64 \ kg )(9.80\ m \ /s^2)[/tex]
[tex]W_w = 6.272 \ N[/tex]
For the speed of the water before hitting the bucket; we have:
[tex]v = \sqrt{2gh}[/tex]
[tex]v = \sqrt{2*9.80 \ m/s^2 * 3.60 \ m}[/tex]
v = 8.4 m/s
Now, the force required to stop the water later when it already hit the bucket is:
[tex]F = v ( \dfrac {dm}{dt} )[/tex]
[tex]F = (8.4 \ m/s)( 0.200 \ L/s)[/tex]
F = 1.68 N
Finally, the reading scale is:
[tex]F_{scale[/tex] = 7.154 N + 6.272 N + 1.68 N
= 15.106 N
Answer:
F_scale ≈ 15.12 N
Explanation:
We are given;
Mass flow rate; m' = 0.2 l/s
Time; t = 3.2 s
Mass of bucket; m_b = 0.730 kg
Height; h = 3.6 m
Now, mass of water is;
m_w = 0.2 l/s × 3.2 s
m_w = 0.64 l
From conversion, 1 litre = 1 kg
Thus: m_w = 0.64 kg
Now, let's calculate final velocity from Newton's third equation of motion.
v² = u² + 2gh
Initial velocity is 0. Thus;
v² = 0 + 2(9.8 × 3.6)
v² = 70.56
v = √70.56
v = 8.4 m/s
Now, total mass of water and bucket is;
m_t = m_w + m_b = 0.64 + 0.73
m_t = 1.37 kg
Force on the scale is calculated from;
F_scale = (m_t)g + (m_w)v/t
F_scale = (1.37 × 9.81) + (0.64 × 8.4/3.2)
F_scale ≈ 15.12 N
Describe what determines magnetism and how an electromagnet works.
Answer:
Magnetism is the force exerted by magnets when they attract or repel each other
hope it helps you:)
How could you find the mass of a box of pencils?
Find the mass of the parts, and then add those masses together.
Find the mass of each pencil and the mass of the box, and then add those masses together.
Find the mass of the whole.
all of the above
Explanation:
All of the ways mentioned can be used to determine the mass of the box and pencils contained.
Mass is the amount of matter contained in a substance. The substance here is the box and the pencils it contains. We can set off to measure the mass of the box and pencil as a wholeAlso, we can group the pencil find their mass and add to the mass of the box. All of these methods will accurately give us the mass of the box and pencil it contains.A student has a rectangular block. It is 2 cm wide, 2 cm tall, and 25 cm long. It has a mass of 600 g. First, calculate the volume of the block. Then, use that answer to determine the density of the block. *
Answer:
6g/cm³
Explanation:
Given parameters;
Mass = 600g
Dimension = 2cm wide, 2cm tall and 25cm long
Unknown:
Density = ?
Solution
Density is the mass per unit volume of any substance. To solve this problem:
Density = [tex]\frac{mass}{volume}[/tex]
Since mass = 600g
Let us find the volume;
Volume = length x width x height
Volume = 25cm x 2cm x 2cm = 100cm³
Therefore;
Density = [tex]\frac{600}{100}[/tex] = 6g/cm³
I think about you all day and at night I watch the stars shoot
I know love is not a game but I can't control what my heart do
I messed up so many times, I know you thinking I don't want you
I never tell you lies, I'm always giving you the hard truth
Remember we was way more than friends, I just wonder, "Would you love me again?"
I'm always having spaceship vibes, sometimes I think that I'm an alien
What is this song?
Answer:
Spaceship Vibes
Explanation:
Song written by NoCap
Free association and dream analysis are techniques used in psychoanalysis to discover a person’s unconscious urges.
Please select the best answer from the choices provided
True or False?
Answer:
T on edge
Explanation:
Answer:
true
Explanation:
Squamous cells are basically clear, dead cells, filled with an ingredient of keratin
called eleidin.
True
False
Squamous cells, which are tiny, flat cells that resemble fish scales, are present in the tissue that makes up the skin's surface, and the lining of the digestive and respiratory systems.
What are the characteristics of Squamous cells?Simple squamous epithelial cells serve as filtration and diffusion mediators. They enable facile transmembrane transit of tiny molecules (i.e., across the membrane and through the cell) because of their straightforward and thin construction.
The centre of squamous epithelial cells, which are big, flattened cells loaded with cytoplasm, is a small, spherical nucleus. They are spherical and unevenly flat.
Therefore, The lumen is a free area that is surrounded by simple squamous epithelium. Simple squamous cells join together to produce a layered structure.
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HELP ME PLEASE, I'M BEING TIMED FAST
Answer:
A) Energy is tranferred from Joey to the water. The temperature of the water increases.
Explanation:
At first Joey jumps and gains a height above the water level of the pool, this way has an energy potential initial, as Joey falls into the water his speed is increased that is to say its energy potential is transformed into kinetic energy, and at the moment of impact with the water, this energy kinetic is transformed into heat which is transferred to the water. Therefore the temperature increment.
Note: This is one of the reasons why space agencies are studying spatial asteroids that are directed toward the earth, as these come with great kinetic energy, and great potential energy, if these are of a considerable size can cause catastrophic damage, even if they fall into the ocean, due to the large amount of energy which can cause the instantaneous evaporation of large amounts of water and collateral damage in other areas.
PLEASE NEED HELP ASAP
Answer:
My youngins heartless, so they ain't playin' no games
We really want 'em dead, he got hit up close range
He fuc__ked up in the head, he wanna see some more brains
On that corner, I couldn't stay up out that do_0pe game
My cousin got indicted dealin' coc__aine
She an Insta>:gram addict, she want more fame
I used to starve, now I'm blowing up like pro__pane
Told my inner self, "I promise you I won't change"
Explanation:
When a charged particle moves perpendicularly to a uniform magnetic field, what best describes its trajectory
Answer:
A circle.
Explanation:
When a charged particle moves perpendicularly to a uniform magnetic field, what best describes its trajectory is a circle.
This ultimately implies that, a charged particle moving perpendicularly to a uniform magnetic field would undergo or experience a uniform circular motion and this simply, describes its trajectory.
Additionally, the frequency would be directly proportional to the mass of the charged particle.
What is the approximate momentum of a car with a mass of 1200 kg and a
velocity of 30.0 km/h? *
A. 13.0 N.S
B. 40.0 N.S
C.3.60 104 N.S
D. 5.40 x 104 N.S
A ball is thrown upward and reaches a maximum height of 20 meters and then returns back to where it was launched. What is the displacement of the ball?
Answer: 0
Explanation: because when it return total displacement is 0
To move the Center of Gravity (CG) forward, you could do which of the following?
Add clay to the nose.
Increase the density of the nose material.
Decrease the volume of the horizontal and vertical stabilizer material.
All of the above.
its not Increase the density of the nose material bc i tried that so help pleasee
Answer:
I think it's no. 3
Decrease the volume of the horizontal and vertical stabilizer material.
Explanation:
Lemme know if it's correct
Answer:
all of the above
Explanation:
is prey abiotic or biotic?