Answer:
1. The correct way a cell phone call goes out is;
The phone call goes out, transmits through radio waves, then moves to the central hub. Then the signal go to the nearest tower to the receiver of the call
2. Long wavelength
3. Microwave
Explanation:
1. When making a call through a cell phone, the speech made is digitized such that it is converted to electrical signals which are then converted into number strings that are transmitted out of the antenna of the phone as radio waves which are then picked up by the closest cellphone tower mast which then transmit the signal to the applicable central hub from where the signal is transmitted to the tower closest to the intended call receiver
Therefore, the correct option is that the phone call goes out, transmits through radio waves, then moves to the central hub. Then the signal go to the nearest tower to the receiver of the call
2. The property of AM frequencies that allow them to travel over long distances is long wavelength
The frequency of AM radio waves is between 540 kHz and 1600 kHz, which can be propagated as ground wave or by the ionosphere at night
3. Cell phones makes use of the subcategory of microwave which is the super high frequency (SHF) band which with a range of 3 GHz to 30 GHz
If a runner goes 500 meters with an average speed of 7.0 m/s. How long were they running?
Answer: s=d/t= 500/7.0=71.42 m/s
Explanation:
If a runner goes 500 meters with an average speed of 7.0 m/s, then he would have run in about 71.42 seconds.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.
average speed = total distance /Total time
As given in the problem If a runner goes 500 meters with an average speed of 7.0 m/s then we have to find out How long was he running,
time consumed by the runner = distance covered by the runner/average speed of the runner
time consumed by the runner = 500 meters /7 meters/seconds
= 71.42 seconds.
Thus, the time consumed by the runner would have been 71.42 seconds.
Learn more about speed from here, refer to the link;
brainly.com/question/7359669
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A load of 600N is lifted using a first class lever applying an effort of 350N. If the distance between the fulcrum and the effort is 60cm and the distance between the load and the fulcrum is 30cm, calculate it's efficiency
Answer:
The efficiency of the machine is 85.5%
Explanation:
Mechanical advantage = Load/Effort
= 600/350 = 1.71
Velocity ratio = distance moved by effort/distance moved by load
= 60/30 = 2
Efficiency = (M.A/V.R) × 100%
= (1.71/2) × 100
= 0.855 × 100
= 85.5%
The efficiency of the machine is 85.5%
Given:
Load= 600N
Effort= 350N
distance between the fulcrum and the effort = 60cm
distance between the load and the fulcrum = 30cm
The formula of the mechanical advantage(MA) of a lever is given as
Mechanical advantage = Load/Effort
Mechanical advantage = [tex]\frac{600}{350} =1.71[/tex]
Velocity ratio = distance moved by effort/distance moved by load
Velocity ratio = [tex]\frac{60}{30} =2[/tex]
Efficiency = (M.A/V.R) × 100%
= (1.71/2) × 100
= 0.855 × 100
Efficiency= 85.5%
Learn more:
brainly.com/question/23693991
HELP PLS
2. How would these gravity forces change if the Sun got much bigger?
Decrease. Increase. Stay the same
3. How would these gravity forces change if the Earth was much closer to the Sum?
Decrease Increase. Stay the same
4. How would these gravity forces change if the Earth got much smaller?
Decrease. Increase. Stay the same
face
Answer:
2. increase
3. stay the same
4. Decrease
Explanation:
(let me know if im wrong on any we learned this last year so I might be a little rusty on this subject)
The force of gravity increases with increase in the size of the Sun and with decrease in the distance between the earth and the Sun. However, it decreases with decrease in the size of the earth.
What is gravity?Gravity is the force of attraction that exists between two bodies separated by a given distance.
The force of gravity increases with increase in the size of the bodies as well as with a decrease in the distance of separation.
However, the force of gravity decreases with decrease in the size of the bodies as well as with a increase in the distance of separation.
Thus, for the force of gravity between the earth and the Sun;
Force of gravity increases with increase in the size of the SunForce of gravity increases with decrease in the distance between the earth and the Sun Force of gravity decreases with decrease in the size of the earth.Therefore, the force of gravity is affected by size of the bodies as well as the distance separating the bodies.
Learn more about force of gravity at: https://brainly.com/question/24783651
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II NEED HELP WITH THIS QUESTION PLS
Answer:
Suppose that the frequency of the first harmonic is F, then the frequency of the second harmonic will be 2*F
The third one will be 3*F
and so on.
Then:
a) the first harmonic is 262 Hz,
Then the third harmonic will be 3*262Hz = 786 Hz
b) if F is the frequency of the first harmonic, and we want to find this.
We know that the fifth harmonic frequency is 1700Hz
Then:
5*F = 1700 Hz
F = (1700Hz)/5 = 340Hz
c) We want to find the fifth harmonic such that we know that the third overtone frequency is 984 Hz.
An overtone is any frequency larger than the fundamental frequency; overtone is just another name for harmonic.
Such that the second overtone is the same as the second harmonic, the third overtone is the same as the third harmonic, etc.
Then the third overtone is the same as the third harmonic.
This means that if F is the first harmonic, then:
3*F = 984 Hz
F = 984Hz/3 = 328 Hz
And the fifth harmonic will be:
5*328 Hz = 1640 Hz
Which statement is true for nuclear reactions but not for chemical reactions?
Answer:
D
Explanation: this is why they release so much energy
Answer:
They convert some mass into energy
Explanation:
Ap3x
El profesor pide a juan que le indique tres magnitudes de su libro de texto y el le contesta; su peso, tamaño y el diseño de la portada. ¿es correcta su respuesta? En su caso, ¿que no es correcto?
Answer:
Explanation:
Yo creo que el no es correcto y que no es correcto es el diseño de la portada
What is the length of the rod as measured by this ruler?
2.0 cm
2.1 cm
2.2 cm
2.3 cm
2.2 CM is your answer
jfkanfnakcndbcnd
Answer:
2.2 cm
Explanation:
milimeters are the little hash marks and there are ten so it is 2.2 cm
The waves that heat a cup of water in the microwave are an example of electromagnetic waves. True or False
That's true.
They're radio waves, at the frequency of 2.45 GHz (in all microwave appliances manufactured in the US).
A 65 kg woman is inside an elevator. (A) Calculate her apparent weight (normal force) in Newtons if the elevator moves at constant speed of 10 m/s downward. Be sure to keep 3 significant digits.
Answer:
W = 637 N
Explanation:
For this exercise we will use Newton's second law
F -W = m a
where F is the force, m the mass and the acceleration
in this case the force is the weight of the body and as the elevator goes at constant speed the acceleration is zero
F = W
a = 0
F = W
W = m g
W = 65 9.8
W = 637 N
what is the difference between light energy and heat energy
ANSWER:
What is the difference between heat and light? - Physics Stack ... Heat and light are different but they are both forms of energy. Heat is a form of kinetic energy contained in the random motion of the particles of a material. Light is a form of electromagnetic energy. As with other forms of energy, heat energy can be transformed into light energy and vice versa.
Please Help!!!!!!!!!!!! (physics)
What type of reaction is below?
Answer:
B) Synthesis
Explanation:
A combination reaction, also known as a synthesis reaction in chemistry, is when two or more substances, or reactants, combine with each other to form a new product. The product will always be a compound.
An object has 1200 J of gravitational potential energy when it is dropped. Right when the object hits the ground how much kinetic energy does it have?
Answer:
The kinetic energy is 1200 J
Explanation:
The Principle of Conservation of energy states that "energy is neither created nor destroyed, it is transformed".
This means that energy can be transformed from one form to another, but the total amount of energy always remains constant, that is, the total energy is the same before and after each transformation.
The mechanical energy of a body or a physical system is the sum of its kinetic energy and the potential energy. According to the Principle of Conservation of Energy for mechanical energy, the total mechanical energy that a body possesses is constant at every instant of time.
Since mechanical energy is equal to the sum of kinetic energy and gravitational potential energy that a body possesses, the only way to stay constant is that:
when the kinetic energy increases the gravitational potential energy decreases, when gravitational potential energy increases, kinetic energy decreases.Due to the Principle of Conservation of Energy you can say that the gravitational potential energy is converted to kinetic energy. So Gravitational potential energy at the top = kinetic energy at the bottom
The kinetic energy is 1200 J
What is a molecule?
Answer:
A molecule is defined as two or more atom of same element or different element grouped together
Three point charges are arranged along the x axis. Charge q1 = -4.10 nC is located at x= 0.250 mand charge q2 = 2.20 nC is at x= -0.320 m . A positive point charge q3 is located at the origin.
What must the value of q3 be for the net force on this point charge to have magnitude 3.10 μN ? (ans in nC)
What is the direction of the net force on q3? + or - direction
Where along the x axis can q3 be placed and the net force on it be zero, other than the trivial answers of x=+[infinity] and x=−[infinity]? (ans in m)
Answer:
1) q₃ is approximately -7.58 nC
2) The direction of the net force on 'q₃' is the negative '-' direction
3) For the net force on 'q₃' to be zero, 'q₃' can be placed at x = -0.079 m or x = -1.881 m
Explanation:
1) The force, 'F', between two charged spheres is given as follows;
[tex]F = \dfrac{k \cdot q_1 \cdot q_2}{r^2}[/tex]
The net force acting on the point charge, 'q₃', is given as follows;
[tex]F_{NET} = \dfrac{k \cdot q_1 \cdot q_3}{x_1^2} + \dfrac{k \cdot q_2 \cdot q_3}{x_2^2}[/tex]
By substituting the given values, we have;
[tex]F_{NET} = 3.10 \ \mu N = \dfrac{k \cdot (-4.10 \ nC) \cdot q_3}{(0.250 \ m) ^2} + \dfrac{k \cdot 2.20 \ nC \cdot q_3}{(-0.320 \ m)^2}[/tex]
[tex]3.01 \ \mu N= q_3 \cdot \left ( \dfrac{k \cdot (-4.10 \ nC) }{(0.250 \ m) ^2} + \dfrac{k \cdot 2.20 \ nC }{(-0.320 \ m)^2} \right) = -\dfrac{14117 \ nC \cdot K}{320}[/tex]
[tex]\therefore q_3 = 3.01 \ \mu N \times -\dfrac{320 \ m^2}{14117 \ nC \cdot K}[/tex]
K = 9 × 10⁹ N·m²·C⁻²
[tex]\therefore q_3 = 3.01 \ \times 10^{-6} \ N \times -\dfrac{320 \ m^2}{14117 \times 10^{-9} \ C \times 9 \times 10^9 \ N \cdot m^2 \cdot C^{-2}}= -7.58 \ nC[/tex]
q₃ ≈ -7.58 nC
2) Given that the negative charge, 'q₁' (-4.10 nC), is located at x = 0.250 m, which is on the positive, '+' side of the origin, it will repel the negatively charged 'q₃', to the '-' direction. q₃ will also be attracted to the '-' direction by the positively charged 'q₂' which is at -0.320 m on the negative side of the origin
The net force's direction on q₃ will be in the '-' direction
3) For zero net force, we have;
The distance between the given point charges, r = 0.250 - (-0.320)) = 0.57 m
Let 'r1' represent the distance between 'q1' and 'q3', therefore, the distance between 'q2' and 'q3' is 0.57 - r1
By substitution, we have;
[tex]0 \ N= q_3 \cdot \left ( \dfrac{k \cdot (-4.10 \ nC) }{(0.57 - r_1 ) ^2} + \dfrac{k \cdot 2.20 \ nC }{(r_1)^2} \right)[/tex]
[tex]\therefore \dfrac{k \cdot 4.10 \ nC }{(0.57 - r_1 ) ^2} = \dfrac{k \cdot 2.20 \ nC }{(r_1)^2}[/tex]
From which we have;
[tex]\dfrac{4.10 \ nC }{(0.57 - r_1 ) ^2} = \dfrac{2.20 \ nC }{(r_1)^2}[/tex]
(r₁)²×4.10 = 2.20 × (0.57 - r₁)²
From the above equation, we have;
95,000·r₁²+ 125,400·r₁-35739 = 0
Solving, using a graphing calculator we get;
r₁ ≈ 0.241 or r₁ ≈ -1.561
Where, 'r₁', is measured from 'q₂', therefore, we have;
r₁ = 0.241 + (-0.320) ≈ -0.079 or r₁ = -1.561 + (-0.320) ≈ -1.881
Therefore, the charge 'q₃' can be placed at x = -0.079 or x = -1.881 for the ne force on it to be zero
What force controls the movement of the planets around the sun, holds together stars grouped in galaxies, and galaxies grouped in clusters?
Answer:
Gravity.
Explanation:
The force that controls the movement of the planets around the sun, holds together stars grouped in galaxies, and galaxies grouped in clusters is called gravity.
This ultimately implies that, gravity is considered to be a universal force of attraction that acts between all objects that has both mass, energy and occupy space. Therefore, it acts in such a way as to bring objects together.
Additionally, the gravity of earth makes it possible for all physical objects to possess weight.
Weight can be defined as the force acting on a body or an object as a result of gravity.
Mathematically, weight is given by the formula;
[tex] Weight = mg [/tex]
Where;
m is the mass of an object.
g is acceleration due to gravity.
Water vapor is an example of a(n)
Answer:
Water vapor is steam. An example of water vapor is the floating mist above a pot of boiling water. Water in the form of a gas; steam.
Explanation:
A wave travels at 13 m/s and the crests are 6 meters apart. How many waves would you see pass you by per second? (round up to the nearest decimal)
(PLS QUICK)
Answer:Number of waves =2.2
Explanation:
The frequency of A wave is defined as the number of waves moving a fixed point per second which is given as
f=[tex]\frac{N}{t}[/tex]
F= Frequency
N= number of waves
t= time
We first find the frequency
Given velocity of the wave, v = 13m/s
and wavelength, λ as 6meters(distance between two consecutive crest)
, we fiind the frequency using
v= f λ
frequency = v / λ
= (13m/s ) / 6
=2.16s-1
f = [tex]\frac{N}{t}[/tex]
2.16s₋¹= [tex]\frac{N}{1s}[/tex]
Therefore N, Number of waves = 2.16 waves rounded up to 2.2 waves
c) An identical spring is pulled with a force or 75 N The elastie limit of the spring is 72N
Suate and explain whether or not the spring will return to its original shape.
Answer:
Spring cannot return to its original, since a part of its deformation is plastic, not elastic.
Explanation:
Physically speaking, stress is equal to the axial force divided by effective transversal area of spring. In addition, springs have usually a linear relationship between stress and strain in elastic region, since they are made of ductile materials. Axial force is directly proportional to axial stress, which is also directly proportional to axial strain.
Then, if force is greater than force associated with elastic limit of the spring, then spring cannot return to its original, since a part of its deformation is plastic, not elastic.
Georgia drops a brick from the top of an 80.0 m building. What is the velocity of the brick when it hits the ground?
Answer:
the velocity of the brick when it hits the ground is 39.60 m/s
Explanation:
Given;
height through which the ball is dropped, h = 80.0 m
the initial velocity of the brick, u = 0
The final velocity of the brick when it hits the ground is calculated as;
v² = u² + 2gh
v² = 0 + 2 x 9.8 x 80
v² = 1568
v = √1568
v = 39.60 m/s
Therefore, the velocity of the brick when it hits the ground is 39.60 m/s
A student pours a small amount of ethanol into a beaker. She places the beaker on an electronic
balance to find its mass, and adds a thermometer to measure the temperature of the liquid.
Two hours later, she returns to her experiment. She notices that the mass of the bezker and its
contents has decreased. She can also see that the temperature of the ethanol has decreased.
She guesses that some of the ethanol has evaporated from the beaker.
Describe how evaporation can explain the decrease in mass.
b Describe how evaporation can explain the decrease in temperature.
a
Answer:
Evaporation is the vaporization of a liquid to the gaseous phase which occurs at the liquid's surface when the gas above the surface is unsaturated or contains less amount of the evaporating substance and the molecules at the surface absorbs enough energy during the transfer of energy from internal collision to withstand the vapor pressure of the surrounding and exist as a gas
a) Evaporation can explain the decrease in mass as follows;
Given that evaporation is the conversion of a liquid to a gas, the loss in mass of the ethanol can be explained by the conversion of some of the ethanol liquid to gas by evaporation such that the volume of ethanol remaining, and therefore, the mass of ethanol is reduced
b) The evaporation of the energized ethanol molecules from the surface of the ethanol results in a loss of energy of the remaining ethanol in the beaker, which can be observed as a reduction in temperature of the ethanol
Explanation:
What is the amount of nickel, which has an average atomic mass of 58.7 amu, present in 525 g nickel
Answer:
bhgyg 78 gt78gyug
Explanation:
Answer:77.98
Explanation:
Need help ASAP
Will mark BRAINLIST and thanks only for correct answers
1.Which property of AM frequencies allow them to travel over long distances?
-high amplitude
-high energy
-constant velocity
-long wavelength
2.what types of waves do cell phones use?
-radio waves
-gamma rays
-microwaves
HELP IT'S DUE TOMORROW ;w;
Give an example of each of the following types of matter:
a) heterogeneous mixture:
b) homogeneous mixture:
c) element:
d) compound:
If opposing forces acting on an object are equal, the net force is
N. (Enter your answer in the numerical form)
help me please
Answer:
0 N
Explanation:
suppose, you push a box with 5 N, and another person pushes the box on the opposite side of the box with 5 N, the net force (resultant ) is 0 N, the box will not move if it wasn't moving
hope this helps
how does the mass of object 1 and object 2 relate to gravitational force
Answer:
They are directly proportional to gravitational force.
Explanation:
Newton's Law of Gravity states that [tex]F_G=\frac{Gm_1m_2}{r^{2}}[/tex]. The two "m" values are the masses of the objects, r is the distance between their centers, and G is the gravitational constant. Notice how the "m" values are in the fraction's numerator (i.e., on top)? That means increasing even one of the objects' masses will increase the gravitational force. This is known as a direct relationship.
Of course, you could always use the wonderful table provided to solve this! You don't believe what I wrote above? Take on of the two objects' masses, divide the gravitational force by that number, and see what happens. Multiply the two masses together, and see what happens. Prove it for yourself!
I hope this increases your understanding of this concept. Have yourself a wondrous day, 'kay?
Can someone help me please
Answer:
distance i think im not sure
You weigh 580 N on Earth. If you were to go to Mars, where its gravitational pull is 3 . 7 11 m /s 2 , what would you weigh? (Hint: gravity on Earth is 9.8 m /s 2 .
Answer:
59.18 kg
Explanation:
use f=ma
f= 580 N
a = 9.8 m/s 2
weigh(m) doesn't change only force(F) changes
Answer: 219.6N
Explanation:
Find the mass of this person by dividing his weight by the accelleration. Remember, F=ma
580 = m*9.8
m = 59.18kg
Then multiply the mass by the new gravitational acceleration on Mars.
59.18*3.711 = 219.6N
What is the best example of a compound machine
Answer:
chemical resemblance is physically indolence
Explanation:
Due to H2O hypermolecules
Answer:
The two basic families of simple machines are the lever family and the inclined plane family. Within the lever family are the simple lever, the pulley and the wheel and axle. Within the inclined plane family are the simple inclined plane, the wedge and the screw. These simple machines create mechanical advantage when you use them, as they allow you to exert more force with less energy on loads that you could not ordinarily move.
Explanation:
if you wanna make it easier you can number them going down 1,2,3, or 4 & just tell me the number
the number is 1 I hope this help