How long does it take for a radio message to travel from earth to the moon and back? (see the inside back cover of the textbook for the necessary data.)
Answers
Radio communication can travel from Earth to the moon and return in about 2.5 seconds.
This is due to the fact that radio signals move at a speed of roughly 300,000 km/s and that there are 350,000 km between the Earth and the moon. Therefore, the total travel time is 1.25 seconds there and 1.25 seconds back.
The longest electromagnetic spectrum’s wavelengths that are found in radio waves are mostly found at frequencies of 300 gigahertz and below. The wavelength for 300 GHz is 1 mm, while the wavelength for 30 Hz is 10,000 kilometers.
What are radio waves and how do these radio waves work?Radio waves are electromagnetic radiation types that are most commonly used in communication devices like radios, mobile phones, and televisions.
These gadgets are designed to take in radio waves and then transform them into sound waves by causing mechanical movements in the speaker.
How are radio waves produced?Electromagnetic waves are sent and received by the radio equipment in order to operate. An extremely fast-moving electrical current makes up the radio signal.
This field is broadcasted by a transmitter by using an antenna. After this, a receiver picks up the field and then converts it to the audio heard on the radio.
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Related Questions
Briana builds a circuit that has a resistance of 8. 0. What voltage should she apply to have a current of 0. 8 A? 0. 10 V 6. 4 V 7. 2 V 10 V.
Answers
Answer:
To have a current of 0.8 A in a circuit with a resistance of 8.0 Ω, Briana should apply a voltage of 6.4 V.
Explanation:
Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor. Mathematically, Ohm's Law can be expressed as V = I * R, where V represents the voltage in volts (V), I represents the current in amperes (A), and R represents the resistance in ohms (Ω).
The relationship between voltage (V), current (I), and resistance (R) is given by Ohm's Law: V = I * R. Plugging in the values, V = 0.8 A * 8.0 Ω = 6.4 V.
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A rocket is launched from the surface of the earth with a speed of 9.0x103 m/s. What is the maximum altitude reached by the rocket? (MEarth=5.98x1024 kg, REarth=6.37x106 m)
Answers
From the Law of conservation of energy, we know that the sum of the kinetic and potential energy of the rocket is the same at the surface of the Earth and at the maximum altitude. Nevertheless, the kinetic energy of the rocket when it is at the maximum altitude is 0:
\(\begin{gathered} K_1+U_1=K_2+U_2 \\ K_2=0 \\ \Rightarrow K_1+U_1=U_2 \end{gathered}\)The kinetic energy is given by:
\(K=\frac{1}{2}mv^2\)On the other hand, the gravitational potential energy for big changes in altitude (comparable to the radius of the Earth) is given by the expression:
\(U=-\frac{GMm}{r}\)Where M is the mass of the Earth, m is the mass of the rocket, r is the distance from the center of the Earth to the rocket and G is the gravitational constant:
\(G=6.67\times10^{-11}N\cdot\frac{m^2}{\operatorname{kg}}\)At the beggining of the movement, the value of r corresponds to the radius of the Earth:
\(U_1=-\frac{GMm}{R_E}\)At the end of the movement, the value of r corresponds to the radius of the Earth plus the maximum altitude h:
\(U_2=-\frac{GMm}{R_E+h_{}}\)Substitute the expressions for U_1, K_1 and U_2 and simplify the equation by eliminating the factor m:
\(\begin{gathered} \frac{1}{2}mv^2-\frac{GMm}{R_E}=-\frac{GMm}{R_E+h} \\ \Rightarrow\frac{1}{2}v^2-\frac{GM}{R_E}=-\frac{GM}{R_E+h} \end{gathered}\)Isolate the term GM/(R_E+h):
\(\Rightarrow\frac{GM}{R_E+h}=\frac{GM}{R_E_{}}-\frac{1}{2}v^2\)Divide both sides by the factor GM:
\(\Rightarrow\frac{1}{R_E+h}=\frac{1}{R_E}-\frac{v^2}{2GM}\)Take the reciprocal to both sides of the equation:
\(\Rightarrow R_E+h=\frac{1}{\frac{1}{R_E}-\frac{v^2}{2GM}}\)Isolate h:
\(h=\frac{1}{\frac{1}{R_E}-\frac{v^2}{2GM}}-R_E\)Substitute the values of each variable: R_E=6.37x10^6m, M=5.98x10^24kg, G=6.67x10^-11 N*m^2/kg^2, and v=9.0x10^-3 m/s:
\(\begin{gathered} h=\frac{1}{\frac{1}{6.37\times10^6m}-\frac{(9.0\times10^3\cdot\frac{m}{s})^2}{2(6.67\times10^{-11}N\cdot\frac{m^2}{kg^2})(5.98\times10^{24}kg)}}-6.37\times10^6m \\ =18.03\times10^6m-6.37\times10^6m \\ =11.7\times10^6m \end{gathered}\)Therefore, the maximum altitude reached by a rocket with an initial speed of 9.0x10^3m is:
\(11.7\times10^6m\)u r a legend if u get this right
Answers
Answer:
A is Spring
B is Winter
C is Fall
D is Summer
Explanation:
How fast is a 90kg man running if his kinetic energy is 720 J?
Answers
4 m/s
Explanation:
KE=1/2mv^2
720=1/2(90)
720=45v^2
divide by 45
16= v^2
over the square root
4=v
v= 4m/s
is this true or false?
The secret to walking for fitness is shifting from a regular walk to one with a more athletic and powerful pace.
Answers
Answer:
true
Explanation:
I have the same quiz question on k12
I don't know if I got it right or not please tell me if I got it right and thankyou
It is true that the secret to walking for fitness is shifting from a regular walk to one with a more athletic and powerful pace.
What is athletic pace?Pace is simply how fast you're running, and it's usually expressed as the average time it takes you to run one kilometre during a longer run.
Pacing, in its most basic form, refers to the rate at which you run (i.e., how quickly you run a certain distance).
The main idea behind it is to ensure that you have enough energy for the duration of your workout, which is especially important for longer distance running.
Because walking is less strenuous than running, you'll need to walk for longer or more frequently to reap the same benefits.
Running is more efficient, but it has a higher risk of injury and requires more time to heal if injured.
Thus, the given statement is true.
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Radiation of a given wavelength causes electrons to be emitted from the surface of metal 1 but not from the surface of metal 2. Why could this be?
Answers
The phenomenon described is known as the photoelectric effect. It takes place whilst a beam of mild (radiation) of a certain frequency or energy (wavelength) strikes a metal surface and causes electrons to be emitted from it.
The photoelectric effect is a phenomenon wherein electrons are emitted from a fabric whilst it's far uncovered to electromagnetic radiation, along with light. This effect was first determined by using Heinrich Hertz in 1887 and changed into later defined via Albert Einstein in 1905, for which he become presented the Nobel Prize in Physics in 1921.
According to Einstein's clarification, mild consists of particles known as photons, which bring energy. whilst a photon strikes an atom in the cloth, it transfers its power to an electron, that could then be emitted from the material if the strength of the photon is extra than the binding power of the electron to the material. The emitted electrons are referred to as photoelectrons.
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TRUE OR FALSE!!!!!
PLEASE HELP
Igneous rock is formed by volcanoes releasing magma from the mantle, the rock cools and piles up forming a mountain. Rivers direct water to cool magma underground forming metamorphic rock under lake beds.
Answers
Answer:
true
Explanation:
this is true, igneous rocks are formed from molten lava when it cools
Answer: True
Explanation:
The volume of a cone is given by V = (1/12)πD2h. The cone’s measured height is 10.0 in. with Sh = ±0.20 in. Its measured diameter is 6.0 in., with SD = ±0.20 in. What are the cone’s volume and standard deviation? (this question is related to least square estimation in surveying)
Answers
(1) The volume of the cone can be calculated using the given formula V = (1/12)πD^2h. Substituting the values D = 6.0 in. and h = 10.0 in., we can find the volume V.
(2) To calculate the standard deviation of the cone's volume, we need to consider the uncertainties in the measured height and diameter. The standard deviation can be found using the error propagation formula, which involves taking the partial derivatives of the volume equation with respect to the variables (height and diameter) and then multiplying them by their respective standard deviations. By substituting the given standard deviations (Sh = ±0.20 in. and SD = ±0.20 in.) into the error propagation formula, we can calculate the standard deviation of the cone's volume.
The first part involves calculating the volume of the cone using the given formula and the provided measurements of the height and diameter. By substituting the values into the formula, we can determine the exact volume of the cone.
In the second part, we consider the uncertainties in the measured height and diameter by calculating the standard deviation of the cone's volume. This is done using the error propagation formula, which accounts for the effect of uncertainties in the variables on the final result. By substituting the given standard deviations into the error propagation formula, we can determine the standard deviation associated with the cone's volume. This provides an estimate of the uncertainty in the volume measurement due to the uncertainties in the height and diameter measurements.
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When a solid compound dissolves in water
Answers
Answer:
The solid separates and disperse uniformly throughout the solution.
How fast does a 500.0 Hz sound wave travel in air if its wavelength is 0.68 m?
Answers
Hello,
QUESTION)✔ We have : λ = T x v ⇔ v = λ x f
v = 500 x 0,68 v = 340 m/sThe speed of this sound wave is therefore 340 m/s.
can position along the x-axis and angular momentum about the x-axis be measured simultaneously to arbitrary precition?
Answers
Position along the x-axis and angular momentum about the x-axis cannot be measured simultaneously to arbitrary precision.
According to the Heisenberg uncertainty principle, position and momentum cannot be measured simultaneously to arbitrary precision. It applies to angular momentum and position in the same way that it applies to linear momentum and position. Therefore, the answer is no, they cannot be measured simultaneously to arbitrary precision.
The Heisenberg uncertainty principle is a fundamental principle of quantum mechanics that relates to the measurement of two complementary physical quantities, such as position and momentum. It states that the more precisely one of the quantities is known, the less precisely the other can be known. In other words, the more accurately we know the position of a particle, the less accurately we can know its momentum (and vice versa).
This principle has significant implications for the measurement of quantum systems, as it implies that there is always a fundamental limit to the precision with which two complementary physical quantities can be measured. This limit is determined by Planck's constant, which is a fundamental constant of nature that relates to the energy of a quantum system.
Therefore, the Heisenberg uncertainty principle is an important principle for understanding the behavior of quantum systems and is used in a wide range of applications in modern physics.
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You can make a smoothie in a blender with a power of 350 watts and an
efficiency of 75 percent. How much energy is actually being used to make the
smoothie in 120 seconds?
A. 31,500 J
B. 40,125 J
C. 38,900 J
O D. 10,500 J
Answers
Answer:
A. 31500 J
Explanation:
E(J) = P(W) × t(s)
31500J of energy is actually being used to make the smoothie in 120 seconds
What is energy ?
Energy is the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other forms . Mathematically it can defined as the power multiplies by time
given
Power = 350 watt
time = 120 seconds
Efficiency = 75%
energy = ?
efficiency = Power out / Power in
Power out = efficiency * power in
Power out = 0.75 * 350 = 262.5 J
Energy = power * time
= 262.5 * 120
= 31,500 J
31500J of energy is actually being used to make the smoothie in 120 seconds
correct answer is A. 31,500 J
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Which of the following describes how you can see the moon at night?
A. The sun's ray's diffract around the moon
B. The sun's rays reflect off the moon's surface
C.The sun's rays refract through the moon.
D. The sun's rays are absorbed by the moon's surface.
Answers
Answer:
A
Explanation:
The sun Is behind the mood when the sun Is not out.
The one that describes how you can see the moon at night is the sun's rays reflect off the moon's surface. The correct option is B.
The moon's surface reflects the sun's beams. The Sun, which is situated on the other side of the Earth from the moon, shines on it during the night.
Moonlight arises when sunlight strikes the moon and reflects off its surface. When light beams change direction after colliding with a surface, the process is known as reflection.
We see the moon's changing phases from Earth because of the moon's shifting locations in regard to the Earth and Sun, which causes different areas of its surface to be illuminated.
Thus, the correct option is B.
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a horizontal force pulls a 40- kg bag of fertilizer across the floor. what is the minimum force required if the coefficient of friction is 0.36?
Answers
Explanation:
You must overcome the force of friction for the bag to move
Normal force = mg = 40 * 9.81 =392.4 N
Normal force * coefficient = force of friction = 392.4 * .36 = 141.3 N
A crane lifts an air conditioner to the top of a building. If the building is 12 m high, and the air conditioner has a mass of 200 kg, how much work did the crane do to lift it? (Hint: the force the crane exerts is equal to the weight of the air conditioner)
Answers
Work needed = 23,520 J
Further explanationGiven
height = 12 m
mass = 200 kg
Required
work needed by the crane
Solution
Work is the transfer of energy caused by the force acting on a moving object
Work is the product of force with the displacement of objects.
Can be formulated
W = F x d
W = Work, J, Nm
F = Force, N
d = distance, m
F = m x g
Input the value :
W = mgd
W = 200 kg x 9.8 m/s²x12 m
W = 23520 J
A parallel-plate capacitor has circular plates of 10 cm radius and a separation of 120 mm.
assume €0= 8,85 x 10^-12 F/m, 1m = 100cm and 1m = 1000mm
Answers
A parallel-plate capacitor with circular plates of 10 cm radius and a separation of 120 mm has a capacitance of 9.27 pF.
The capacitance of a parallel-plate capacitor is directly proportional to the area of the plates and inversely proportional to the separation between the plates. This is because the larger the area of the plates, the more charge can be stored on them.
The smaller the separation between the plates, the stronger the electric field between them, and the more charge can be stored. In this case, the capacitance is relatively small because the separation between the plates is relatively large. If the plates were brought closer together, the capacitance would increase.
This can be calculated using the following formula:
C = (epsilon_0 * A) / d
where:
* C is the capacitance in Farads
* epsilon_0 is the permittivity of free space (8.85 x 10^-12 F/m)
* A is the area of the plates in square meters
* d is the separation between the plates in meters
In this case, the area of the plates is pi * (10 cm)^2 = 78.54 square centimeters, and the separation between the plates is 0.12 m. Substituting these values into the formula, we get:
C = (8.85 x 10^-12 F/m * 78.54 square centimeters) / 0.12 m = 9.27 pF
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I need help on this question please answer within like a PLEASE QUICK HELP
Answers
A student watches as a trash can lid moves across a yard. Which of these could have caused the trash can lid to move?
Answers
Answer:
wind energy
Explanation:
Wind energy can be defined as a form of a solar energy. It is generated by the immense force of the wind that blows in an area. Wind energy is a useful energy and is mostly used to generate electricity. It is clean source of energy.
In the context, trash can lid is being blown away by the wind energy and it is seen moving across the yard. The energy of the wind forces the lid of the trash can to move from one place to another against friction. Thus, wind energy caused the trash can lid to move across the yard as seen by a student.
a lion is running at constant speed toward a gazelle that is standing still, as shown in the top figure above. after several seconds, the gazelle notices the lion and accelerates directly toward him, hoping to pass the lion and force him to reverse direction. as the gazelle accelerates toward and past the lion, the lion changes direction and accelerates in pursuit of the gazelle. the lion and the gazelle eventually each reach constant but different speeds. which of the following sets of graphs shows a reasonable representation of the velocities of the lion and the gazelle as functions of time?
Answers
The graph shown in the first option nicely plots the lion's and gazelle's velocities as a function of time, so option A is the correct answer.
Velocity is the rate of change of displacement over time.
It has SI units as m/s.The total amount of movement of an object per unit time is also called velocity. It depends on both the size and direction of the moving object.Velocity can also be called as speed when distance is taken into consideration instead of displacement.As mentioned in the problem of running at a constant speed towards a gazelle with a standing lion as shown above.
So option A is correct.
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what a measurement standard is defined as?
Answers
Answer:
Measurement is the competion of known quantity to unknown quantity.
Explanation:
I hope that it will be right answer
Answer:
Measurement standard is relationship of a physical quantity.
Explanation:
Measurement standard is the fundamental reference and measuring the compared the device, these reference is controlled to the objects conditions to the physical quantity.
Measurement standard are international and perfect master standard and they can not used to the general purpose, there are following categories are:-(1) primary standards (2) secondary standard (3) working standard.(1) primary standard is also known as the master standard to the careful conditions, they are used to the long internals only and they compare to the secondary standard.(2) Secondary standard is also known as the primary standard these type of standard are compared to the regular intervals, and distribute to the safe custody.(3) Working standard is also used to the workshop and laboratories by the worker these are to used in the materials reduce cost.Measurement standard is the need of working to the standards in based to the international standard system.IF YOU WANT BRAINLIEST ANSWER THIS
pleas pleas pleas don't just do this for points
A gas water heater is 75% efficient. The energy output used to heat the water is 4.6 kWh.
What is the energy input, rounded to the nearest tenth?
A) 3.5 kWh
B) 5.4 kWh
C) 6.1 kWh
D) 16.3 kWh
Answers
A gas water heater is 75% efficient. The energy output used to heat the water is 4.6 kWh.then the energy input is 6.1 kWh
What is the efficiency of an engine?The efficiency of an Indian can be defined as the ratio of the total useful work done by the engine to the total heat absorbed by the engine
It can be represented in the form of percentages or in terms of fractions as well.
In general, the efficiency of an engine is represented by the greek symbol η.
Efficiency = output heat /input heat
η = output heat /input heat
0.75 = 4.6 kWh /input heat
energy input = 6.1 kWh
Thus, the energy input is 6.1 kWh, therefore the correct answer is option C
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Inside a car that was at 273 K, a bottle with a pressure at 100,000 pascals warms up to
350 K. If the volume of the bottle remains constant, what is the pressure, in pascals,
inside the hot water bottle?
Answers
Answer:
P2 = 128,205 pascal.
Explanation:
Given the following data;
Original Pressure, P1 = 100,000 pascals
Original Temperature, T1 = 273K
New Temperature, T2 = 350K
To find new pressure P2, we would use Gay Lussac' law.
Gay Lussac's law states that when the volume of an ideal gas is kept constant, the pressure of the gas is directly proportional to the absolute temperature of the gas.
Mathematically, Gay Lussac's law is given by;
\( PT = K\)
Where;
P represents pressure. T represents temperature. K is the constant of proportionality.\( \frac{P1}{T1} = \frac{P2}{T2}\)
Making P2 as the subject formula, we have;
\( P_{2}= \frac{P1}{T1} * T_{2}\)
Substituting into the equation, we have;
\( P_{2}= \frac{100000}{273} * 350\)
\( P_{2}= 366.3004* 350\)
P2 = 128205.13 ≈ 128205 pascal.
Therefore, the pressure inside the hot water bottle is 128,205 pascal.
A film of oil on a puddle in a parking lot shows a variety of bright colors in swirled patches. What can you say about the thickness of the oil film? (a) It is much less than the wavelength of visible light. (b) It is on the same order of magnitude as the wavelength of visible light. (c) It is much greater than the wavelength of visible light.(d) It might have any relationship to the wavelength of visible light.
Answers
It is on the same order of magnitude as the wavelength of visible light. The correct option is B.
Thus, Thin-film interference is the name for the phenomena where vibrant colors can be observed in an oil coating on a puddle. The oil film's thickness is on the same scale as the visible wavelength.
The interference between the light waves reflected from the upper and bottom surfaces of the film happens when light travels through a thin film, as the oil film in this instance. Bright colours are seen as a result of interference patterns that are both constructive and destructive.
The thickness of the oil film must match the wavelength of visible light for constructive interference to take place and result in the production of visible colors.
Thus, It is on the same order of magnitude as the wavelength of visible light. The correct option is B.
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How can you separate chalk from
chalky water?
Answers
Answer:
Yes
Explanation:
Because the call can evaporate from the water.
Answer:
A centrifuge is utilized to isolated little sums of strong held in suspension from the fluid. For case, chalk from water. The centrifuge contains test-tubes that are spun around at tall speed that causes the strong to sink to the foot of the tube. The fluid is the tapped (poured off) clearing out the strong behind.
Plants release oxygen into the air us what type of sphere
Answers
Answer:
Biosphere
Explanation:
Plants release the biosphere into the atmostphere. :)
An unstrained horizontal spring has a length of 0.40 m and a spring constant of 340 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes. Because of these charges, the spring stretches by 0.033 m relative to its unstrained length. Determine (a) the possible algebraic signs and (b) the magnitude of the charges.
Answers
Answer:
(a) Both the charges are positive or negative.
(b) Teh value of each charge is 1.53 x 10^-5 C.
Explanation:
Spring constant, K = 340 N/m
Natural length, L = 0.4 m
stretch, y = 0.033 m
(a) Let the charge on each sphere is q and they repel each other so the nature of charge of either sphere may be both positive or both negative.
(b) The electrostatic force is balanced by the spring force.
\(\frac{kq^2}{(L + y)^2}=Ky\\\\\\\frac{9\times 10^9 q^2}{(0.4 +0.033)^2} = 340\times0.033\\\\q= 1.53\times 10^{-5} C\)
The acceleration of an object is ____________________ related to the net force exerted upon it and _____________________ related to the mass of the object.
Answers
The acceleration of an object is directly related to the net force exerted upon it and inversely related to the mass of the object.
answer : directly , inversely
A mixture of sand, salt, iron and saw dust is given to you. You are asked to prove it is a mixture. Explain how you could possibly do this.
Answers
True or False: A balanced force acts on different objects, and action-
eaction forces act on the same object. *
A. True
B. False
Answers
Answer:
true
Explanation:
according to the Newton's third law
Two charged particles near each other are released. As they move, the force on each particle increases. Therefore, the particles haveA) the same sign.B) the opposite sign.C) not enough information
Answers
ANSWER
B) the opposite sign
EXPLANATION
The force between charged particles is inversely proportional to the square of the distance between particles, from Coulomb's law:
\(F=k_e\cdot\frac{q_1\cdot q_2}{r^2}\)If the force increases it can mean two things: either one or both particles are gaining charge - which is not the case of this problem, or the distance between them is decreasing. In this case, the distance must be decreasing for the force to increase. This means that the particles are moving towards each other, they are being attracted by each other. Since only particles with opposite signs attract, the answer is option B, they have opposite sign.