Answers
Answer:
Heat transfer processes: Radiation - Natural Convection
Energy balance:
[tex]\dot Q_{rad} -\dot Q_{conv} = \frac{dU_{sys}}{dt}[/tex]
[tex]\epsilon\cdot \sigma\cdot A_{s}\cdot (T_{s}^{4}-T_{a}^{4})-h\cdot A_{s} \cdot (T_{a}-T_{\infty}) = m\cdot c\cdot \frac{dT_{a}}{dt}[/tex]
Explanation:
The asphalt is heated due to the radiation from the sun and cooled by natural convection of the wind. By the First Law of Thermodynamics, we have the following model that represents the system:
[tex]\dot Q_{rad} -\dot Q_{conv} = \frac{dU_{sys}}{dt}[/tex] (1)
Where:
[tex]\dot Q_{rad}[/tex] - Heat transfer by radiation, measured in watts.
[tex]\dot Q_{conv}[/tex] - Heat transfer by natural convection, measured in watts.
[tex]\frac{dU_{sys}}{dt}[/tex] - Rate of change of thermal energy of the asphalt, measured in watts.
By applying the definitions for conduction, radiation and thermal energy, we expand (1) below:
[tex]\epsilon\cdot \sigma\cdot A_{s}\cdot (T_{s}^{4}-T_{a}^{4})-h\cdot A_{s} \cdot (T_{a}-T_{\infty}) = m\cdot c\cdot \frac{dT_{a}}{dt}[/tex] (2)
Where:
[tex]\epsilon[/tex] - Emissivity of the asphalt.
[tex]\sigma[/tex] - Stefan-Boltzmann constant, measured in watts per square meter-quartic Kelvin.
[tex]A_{s}[/tex] - Surface area of the asphalt, measured in square meter.
[tex]T_{s}[/tex] - Temperature of the sun, measured in Kelvin.
[tex]T_{a}[/tex] - Temperature of the asphalt, measured in Kelvin.
[tex]T_{\infty}[/tex] - Temperature of the wind, measured in Kelvin.
[tex]h[/tex] - Natural convection constant, measured in watts per square meter-Kelvin.
[tex]m[/tex] - Mass of the asphalt, measured in kilograms.
[tex]c[/tex] - Specific heat of the asphalt, measured in joules per kilogram-Kelvin.
Related Questions
A rubber ball is dropped and bounces back up. What kind of energy does the ball have at points A, B, and C?
Answers
Answer: At poitns A, B, and C the energy is potential to kinetic energy.
Explanation:
Hope this helped! Thank me with a crown or <3!
A 1500-kg elevator moves upward with constant speed through a vertical distance of 25 m. How much work was done by the tension in the elevator cable
Answers
Answer:
367500Joules
Explanation:
Work done is expressed as;
Work done = force × distance
Force = mass × acceleration due to gravity
Force = 1500×9.8
Force = 14700N
Given
Distance covered = 25m
Workdone = 14700×25
Work done = 367500Joules
Hence the work done by the tension in the elevator cable is 367500Joules
Ram covers distance of zoom in 50 seconds what is his speed
Answers
Answer:
speed = distance/time
this is the equation substitute your values and get the answer....btw check you question again..
what are the properties of heat
Answers
2. Thermal Expansion.
3. Thermal conductivity
A source emits sound with a frequency of 1,000 Hz. It is moving at 20 m/s toward a stationary reflecting wall. If the speed of sound is 340 m/s, an observer at rest directly behind the source hears a beat frequency of
Answers
Answer:
the beat frequency heard by the observed is 58.8 Hz.
Explanation:
Given;
frequency of the source, Fs = 1,000 Hz
velocity of the source, Vs = 20 m/s
velocity of sound, V = 340 m/s
The frequency heard by the observer behind the source is calculated by applying Doppler effect;
[tex]F_s = F_o [\frac{v}{v-v_s} ]\\\\1000 = F_o [\frac{340}{340 -20} ]\\\\1000 = 1.0625F_o\\\\F_o = 941.2 \ Hz[/tex]
The beat frequency heard by the observed = 1000 - 941.2 = 58.8 Hz.
Therefore, the beat frequency heard by the observed is 58.8 Hz.
Answer:
An observer at rest directly behind the source hears a beat frequency of [tex]117.65Hz[/tex]Explanation:
[tex]N_1[/tex] = frequency observed by observer when source goes away from the observer
[tex]N_2[/tex] = when source coming towards observer
[tex]N_1 = m(\frac{V-V_o}{V})\\\\N_1 = 1000(\frac{340-20}{340})\\\\N_1 = 941.17[/tex]
[tex]N_2 = m(\frac{V+V_o}{V})\\\\N_2 = 1000(\frac{340+20}{340})\\\\N_2 = 1058.82[/tex]
Therefore,
[tex]N_2 - N_1 = 1058.82 - 941.17[/tex]
Beat frequency = [tex]117.65Hz[/tex]
For more information on beat frequency, visit
https://brainly.com/subject/physics
The figure shows a cube resting on top of a table . If the table rotates and moves the cube in a counterclockwise circle at a constant speed , describe the direction of the acceleration experienced by the cube .
Answers
Answer:
Forwarded
Explanation:
Why do artificial plant-growth lights have a light spectrum that favors the red and blue portions of the spectrum
Answers
Answer:
because the red and blue regions are the optimum regions for photosynthesis.
Explanation:
Artificial plant-growth lights have a light spectrum that favors the red and blue portions of the spectrum because the red and blue regions are the optimum regions for photosynthesis.
Plants generally need photosynthesis to survive because, during the process, their food is synthesized. The process requires light energy to be absorbed by the green pigment of the plant - the chlorophyll. The light energy excites some electrons of the photosystems of the chlorophyll, leading to the release of the electron. The electron thus travels in an electron transport chain, eventually utilized to generate energy-rich molecules that are later utilized in other parts of the process to manufacture food.
Investigations have revealed that the process of photosynthesis proceeds optimally in the red and light regions of the light spectrum. The discovery has made the manufacturers of artificial plant-growth light to engineer their products to favor more of these two light regions above the rest of the visible light spectrums.
When energy is produced from the light source of various frequencies, wavelengths and energies are called the light spectrum. It is estimated in nm (nanometers).
Plants favour the red and blue light spectra because they absorb and receives the most amount of light.
The phenomena can be explained as:
The blue and red regions of light spectra are considered as the optimum area for the process of photosynthesis.The process of making food by plants requires light to be absorbed by the chloroplast of the cell containing the pigment called chlorophyll.The light spectra containing the blue and red light serves best for the process as it favours the electron transport in the plant ETC system more compared to any other light spectra.Therefore, blue and red favours photosynthesis.
To learn more about light spectra and photosynthesis follow the link:
https://brainly.com/question/2237809
An electron is to be released from rest on the central axis of a uniformly charged disk of radius R. The surface charge density on the disk is +4.00 μC/m^2 and ε0= 8.85 x 10^–12 F/m. What is the magnitude of the electron’s initial acceleration if released at distances of
a. R from the center of the disk?
b. R/100 from the center of the disk?
c. R/1000 from the center of the disk?
d. Why does the acceleration increase only slightly as the release point is moved closer to the disk?
Answers
Answer:
[tex]a=11.86*10^1^5 m/s[/tex]
[tex]a=3.91864074*10^-^2^4 m/s^2[/tex]
[tex]a=3.95426275*10^-^2^4m/s^2[/tex]
Explanation:
From the question we are told that
The surface charge density on the disk is [tex]\sigma=+4.00 \mu C/m^2[/tex]
[tex]\varepsilon _0= 8.85 * 10^–12 F/m.[/tex]
a)Generally the electric field in this situation is given as is mathematically given as
[tex]E=\frac{\sigma}{\varepsilon_0} (1-\frac{R}{\sqrt{2}R}[/tex]
[tex]E=\frac{\sigma}{\varepsilon_0} (1-\frac{1}{\sqrt{2}})[/tex]
[tex]E=67.48*10^3 f/a[/tex]
Generally the Force of release of the electron is mathematically given as
[tex]F=eE[/tex]
[tex]F=ma[/tex]
[tex]a*m=\frac{eE}{1}[/tex]
[tex]a=\frac{1.6*10^-^1^9 *67.48*10^3}{9.1*10^3^1}[/tex]
[tex]a=11.86*10^1^5 m/s[/tex]
b)Generally the electric field in R/100 from the center of the disk is given as is mathematically given as
Generally
[tex]E=\frac{\sigma}{\alpha \varepsilon_0}(1-\frac{1}{\sqrt{(100)^2} }[/tex]
[tex]E=\frac{4.0*10^-^6}{2*8.854*10^-^1^2}(1-\frac{1}{\sqrt{(1+(100)^2} })[/tex]
[tex]E=2.22872692*10^2^7[/tex]
Generally the Force of release of the electron is mathematically given as
[tex]a*m=\frac{eE}{1}[/tex]
[tex]a=\frac{1.6*10^-^1^9 *2.22872692*10^2^7}{9.1*10^3^1}[/tex]
[tex]a=3.91864074*10^-^2^4 m/s^2[/tex]
c)Generally the electric field in R/1000 from the center of the disk is given as is mathematically given as
[tex]E=\frac{\sigma}{\alpha \varepsilon_0}(1-\frac{1}{\sqrt{(1000)^2} }[/tex]
[tex]E=\frac{4.0*10^-^6}{2*8.854*10^-^1^2}(1-\frac{1}{\sqrt{(1+(1000)^2} })[/tex]
[tex]E=2.24898694*10^2^7[/tex]
Generally the Force of release of the electron is mathematically given as
[tex]a*m=\frac{eE}{1}[/tex]
[tex]a=\frac{1.6*10^-^1^9 *2.24898694*10^2^7}{9.1*10^3^1}[/tex]
[tex]a=3.95426275*10^-^2^4m/s^2[/tex]
A pebble is released from rest at a certain height and falls freely, reaching an impact speed of 6 m/s at the floor. Next, the pebble is thrown down with an initial speed of 3 m/s from the same height. What is its speed at the floor
Answers
Answer:
Explanation:
Let h be the height .
initial velocity in first case u = 0
final velocity v = 6 m /s
acceleration due to gravity g = 9.8 m /s²
v² = u² + 2 g h
6² = 0 + 2 x 9.8 x h
h = 1.837 m .
For second case u = 3 m /s
v² = u² + 2 gh
= 3² + 2 x 1.837 x 9.8
= 9 + 36
= 45 m
v = 6.7 m /s
A meteor which is moving at a speed of 100 m si
towards Mars is deteced at a height of 207.2 m
from its surface. The meteor reaches the surface of
Mars after 2 s.
What is the gravitational acceleration of Mars?
Answers
Answer:
Acceleration due to gravity of Mars
Explanation:
The motion of particles in solids, liquids, and gases are distinct in their behavior. Which state of matter is randomly separated with no regular arrangement and move freely at high speeds?
A. Solid
B.Liquid
C.Mixture
D.Gas
Answers
Answer:
D. Gas
Explanation:
There are only three states of matter: solid, liquid and gas. This makes choice c (Mixture) incorrect because it is not part of the group.
The particles in gas are widely separated, which means there's a lot of free space between the particles. This makes it easily compressible. The particles then move past each other, which causes no regular arrangement.
PLEASE HELP!!!! What are 3 ways that machines can make doing work easier? (thats the whole question)
Answers
Answer:
Machines reduce the time of work hence reducing the rate of doing work ( power ).
Machines e.g pulleys carry heavy loads with a less and reasonable effort.
Machines e.g generators induce current in a limited amount of time
Answer:
they can do work easier for an example a car a car make things easier by going some were far it can also be used to help people travel instead of a plane it can also be used for carriying things like a boat. (you can put it in a diffrent way)
Explanation:
hope it helps! :)
6)
A flower pot weighing 42.0 N is hung above a window by three ropes, each
making an angle of 22.o with the vertical, as shown. What is the tension in
each rope supporting the flower pot?
220
Answert
Answers
Answer: 14.5 N
Explanation: NEED SCRATCH PAPER: A flower pot weighing 42.0 N (newtons) is hung above a window by three ropes, each making an angle of 15.0 degrees with the vertical. What is the tension in each rope supporting the flower pot?
✓ 14.5 N
found it on the internet?
For each of the situations described below, the object considered is undergoing some changes. Among the possible changes you should consider are:
(Q) The object is absorbing or giving off heat.
(T) The object's temperature is changing.
(E) The object's thermal energy is changing.
(W) The object is doing mechanical work or having work done on it.
(C) The objects chemical energy is changing.
For each of the two situations, identify which of the five changes is taking place, indicating the applicable letters Q T U W C (or none) as appropriate while providing your reasoning.
a. An ice cube sits in the open air and is melting.
b. A cylinder with a piston on top contains a compressed gas and is sitting on a thermal reservoir (a large iron block that can provide or take thermal energy as the system needs). After everything has come to thermal equilibrium, the piston is moved upward somewhat (very slowly). The object to be considered is the gas in the cylinder.
Answers
Answer: a. (Q), (T), (E)
b. (Q), (T), (E), (W)
Explanation: Thermal Energy and Temperature are closely related: when the temperature rises causing atoms or molecules to move, thermal energy is produced. Thermal energy is the energy within the system.
Mechanical Work is the amount of energy transferred due to an applied force.
Chemical Energy is the energy contained in the bonds of chemical structures of the molecules released when a chemical reaction happens.
Given the explanations, let's analyse the situations:
a. For an ice cube to be melting, it has to be absorbing heat, which means its thermal energy is changing and, consequently, so does its temperature;
b. First, the gas inside the cylinder reaches a thermal equilibrium, which means its thermal energy and temperature changed. Since there were exchange of heat to reach the equilibrium, the gas absorbed or gave off heat. After the equilibrium, when the piston starts to be moved, the energy of the pressure is transferred to the gas, so mechanical work had been done.
What is magnitude of the acceleration of a particle of mass and charge placed between the plates of a parallel plate capacitor of charge density
Answers
Answer:
a = Qo / E0m
Explanation:
The acceleration of a particle of mass m and charge q placed between the plates of a parallel plate capacitor is, [tex]a=\frac{q*E}{m}[/tex]
Let us consider that mass and charge of particle is m and q.
and electric filed between plates of a parallel plate capacitor is E.
The force on a particle between plates of capacitor is given as,
[tex]F=q*E[/tex]
And also, [tex]F=m*a[/tex]
Where a is acceleration of particle.
From above equations,
[tex]m*a=q*E\\\\a=\frac{q*E}{m}[/tex]
Learn more:
https://brainly.com/question/18608559
Some one plzzz help
Answers
Answer:
138 km
Explanation:
All motion will eventually stop due to the "loss" of energy to___.
a) friction and thermal energy
b) gravity
c) kinetic energy
d) potential energy
Answers
Tim’s cow is anemic. The cow is lacking which type of nutrient?
Answers
Answer:
Iron deficiency
Explanation:
or more scientifically explained as decreased hemoglobin levels in your blood but still caused by lack of iron.
A helium-neon laser (λ = 633 nm) illuminates a single slit and is observed on a screen 1.50 m behind the slit. The distance between the first and second minima in the diffraction pattern is 3.75 mm .
Required:
What is the width (in mm) of the slit?
Answers
Answer:
d = 0.25 mm
Explanation:
The position that the Minimal fall in single silt diffraction pattern can be written as
y=λmD/d ..........eqn(1)
(y2 - y1 )= difference of y that exist between first and second minima
D= distance of slit from the screen=1.50m
d= width of the slit
λ= 633 nm = 633×10^-9m
y= position of pth minimal
eqn(1) can be written as
(y2 - y1)= λmD/d .........eqn(2)
If we substitute the given values we have
(y2 - y1 )= [ (2×633×10^-9 × 1.50) /d] -[ (1×633×10^-9 × 1.50) /d]
Simplyfying
(y2 - y1)=(9.495×10^-7)/d
But The distance between the first and second minima in the diffraction pattern = 3.75, which implies that (y2 - y1) = 3.75mm=
✓ we can substitute (y2 - y1)= 3.75mm=3.75 ×10^-3 into expression above
3.75 ×10^-3 =(9.495×10^-7)/d
The we can make "d" subject of the formula
d=(9.495×10^-7)/ (3.75 ×10^-3)
d=0.00025m
d=0.25×10^-3 m
d=0.25 mm
Hence, the width (in mm) of the slit is 0.25mm
Two charges q1 and q2 exert a force of 20 N on each other. If the charge of q1 is doubled, what will the new force be? 1) 40N 2) 80N 3) 20 N 4) 10 N
Answers
Given :
Two charges q1 and q2 exert a force of 20 N on each other.
To Find :
If the charge of q1 is doubled, what will the new force be?
1) 40 N 2) 80 N 3) 20 N 4) 10 N
Solution :
We know, electrostatic force between two charges is given by :
[tex]F = \dfrac{kq_1q_2}{r^2}[/tex]
Here, F = 20 N.
[tex]20 = \dfrac{kq_1q_2}{r^2}[/tex]
Now, if [tex]q_1[/tex] is doubled :
[tex]F'= \dfrac{k(2q_1)q_2}{r^2}\\\\F'= 2\dfrac{kq_1q_2}{r^2}\\\\F'= 2\times F\\\\ F'= 2\times 20 \ N\\\\F'= 40 \ N[/tex]
Therefore, if the charge of q1 is doubled, new force will be 40 N.
A piece of aluminum has a density of 2.70 g/cm^3 and a mass of 775 g. The aluminum is submerged in a container of oil of density 0.650 g/cm^3. How much oil does the metal displace
Answers
Answer:
287cm^3
Explanation:
Given data
Density of aluminium= 2.7g/cm^3
mass of aluminium= 775g
The volume occupied is given as
we know that
density= mass/volume
volume= mass/density
volume= 775/2.7
volume= 287 cm^3
Now based on Archimedes principle, which states that when a body is totally or partially submerged in a fluid it experiences an upthrust which is equal to the volume of the mass displaced
Therefore, the volume of oil displaced is 287cm^3
A strength and conditioning coach recommends that an athlete train by pulling a large amount of mass while sprinting. If action-reaction forces are always equal and opposite, which explanation best describes the action reaction pair acting on the runner ?
A) The runner will not move because the applied force exerted by the runner on the mass will create an equal and opposite frictional force, canceling the applied force
B) The runner will accelerate forward because the applied force exerted by the runner creates an equal and opposite frictional force by the ground, but these forces are exerted on different objects.
С) The runner will accelerate forward because the force of friction by the mass on the runner is always less than the applied force by the runner, resulting in a net force forward
D) The runner will remain motionless because the applied force by the runner in the forward direction is less than the frictional force from the ground, acting in the opposite direction.
Answers
Answer:
The correct answer is B)
Explanation:
Solution:
The correct answer is B)
Because,
Runner is applying a force and forwarding ahead which creates equal and opposite frictional force by the ground. But key point here is that, the equal and opposite force is acting on different objects not on the runner. As, friction force will be applied to the heavy mass and the runner by the ground. So, Runner will always apply greater and opposite force than the total friction force that he is experiencing because of heavy mass friction and its friction due to ground in order to move ahead.
For example, if you pull a empty cart with equal and opposite force, then the cart will not move, as the net force is zero. So, in order to move the cart. you have to apply greater and opposite force.
1. A 20.0 kg weight is hanging from a rope. What is the force of tension on the rope?
Answers
Explanation:
The tension on an object is equal to the mass of the object x gravitational force plus/minus the mass x acceleration. Tension Formula Questions: 1) There is a 5 kg mass hanging from a rope.
PLEASE HELP ME!!!
Stress is a ______________ that's created when we react to particular events.
Question 2 5 pts
What signals the adrenal glands to produce more of the hormones adrenaline and cortisol and release them into the bloodstream?
Group of answer choices
hyperextension
hypothalamus
hypodermis
Question 3 5 pts
When the adrenal glands produce more of the hormones adrenaline what are two of the body’s reaction to these additional hormones:
Group of answer choices
heart rate slows down and pupils constrict
blood pressure and metabolism decrease
heart rate speeds up and sweat is produced
Question 4 5 pts
Match the following terms with their appropriate definitions.
Group of answer choices
the stress response
the events that provoke stress
Question 5 5 pts
The article talks about building up your resilience to cope with stress. What does resilience mean?
Group of answer choices
the capacity to recover quickly from difficulties
incapable of change
not good in stressful situations
Question 6 5 pts
What are two ways that you can control stress?
Group of answer choices
compulsiveness and pesimism
overschedule and junk food
be realistic and get a good night's sleep
Answers
Answer:
1.Stress is a feeling that's created when we react to particular events.
2. What signals the adrenal glands to produce more of the hormones adrenaline and cortisol and release them into the bloodstream?hypothalamus. ... 3. When the adrenal glands produce more of the hormones adrenaline what are two of the body’s reaction to these additional hormones:heart rate speeds up and sweat is produced. 4.the stress response the bodies natural way of dealing with anxiety. 5. the events that provoke stress are job issues or retirement. lack of time or money. grief. family problems. The article talks about building up your resilience to cope with stress. What does resilience mean? the capacity to recover quickly from difficulties. 6. What are two ways that you can control stress? be realistic and get a good night's sleep.
Luyando wants to have a bit of fun with her wagon. She puts her 12 baby sister, Waluse, on the wagon and pulls it across the floor using a rope at an angle of 22° above the floor. Using the spring balance that mum uses to weigh things in the kitchen, Luyando realises that the tension in the rope is constant and has a value of about 40 . Use the work-energy theorem to find Waluse’s speed after being pulled 4.0 across the living room. The coefficient of friction is 0.2 and the weight of the wagon is 3kg
Answers
Answer:
work energy equation
[tex]w.d(external)= \delta \: k.e+ \: \: \ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: w.d(ressesive)[/tex]
Explanation:
first of all we have to find reaction force to find fr
[tex]fr = \mu \: mg \\ mg = reaction \: force(r) \\ f = ma \\ r + 40 \sin(22) - 150 = 0 \\ r = 150 - 40 \sin(22) [/tex]
then let's find friction
[tex]fr = \mu \: r \\ 0.2 \times (150 - 40 \sin(22) )[/tex]
then let's apply work energy principle...its on the 2nd picture
v = 2.3ms^-1A 1kg sphere rotates in a circular path of radius 0.2m from rest and it reaches an angular speed of 20rad/sec in 10 second calculate the tangential acceleration ?
Answers
Answer:
0.4 m/s²
Explanation:
From the question given above, the following data were obtained:
Mass (m) = 1 kg
Radius (r) = 0.2 m
Angular speed (w) = 20 rad/sec
Time (t) = 10 s
Tangential acceleration (aₜ) =?
Next, we shall determine the angular acceleration (a) of the sphere. This can be obtained as follow:
Angular speed (w) = 20 rad/sec
Time (t) = 10 s
Angular acceleration (a) =?
a = w/t
a = 20/10
a = 2 rad/s²
Finally, we shall determine the tangential acceleration (aₜ) of the sphere. This can be obtained as follow:
The tangential acceleration (aₜ) and the angular acceleration (a) are related according to the equation:
Tangential acceleration (aₜ) = Angular acceleration (a) × Radius (r)
aₜ = ar
With the above formula, we can obtain the tangential acceleration (aₜ) as follow:
Radius (r) = 0.2 m
Angular acceleration (a) = 2 rad/s²
Tangential acceleration (aₜ) =?
aₜ = ar
aₜ = 2 × 0.2
aₜ = 0.4 m/s²
Therefore, the tangential acceleration is 0.4 m/s²
The wind exerts a force of 425 N to the north on a sailboat, while the water exerts a drag force of 325N in the opposite direction. What is the acceleration of the sailboat if the mass is 4100 kg?
Answers
Answer:
its n vv
Explanation:
Which of the following is NOT an argument for showing that the Earth must be round: a. during an eclipse of the Moon, the shadow of the Earth is always seen to be round b. when ships travel a large distance away, we see their hulls disappear first and their masts disappear last c. the height of the North Star changes as we travel to different latitudes d. photographs of the Earth from space always show a round body e. the Sun is seen blocking different constellations in the course of a year Submit Your Answer
Answers
Answer: The correct option is option E (the Sun is seen blocking different constellations in the course of a year.
Explanation:
The earth, which is one of the planets of the solar system that supports life, is shperical in shape. The spherical ( round) shape of the earth is marked by the intervening highlands and oceans on its surface.
Evidence to show that the earth is shperical are:
--> The Lunar eclipse: During an eclipse of the Moon, the shadow of the Earth is always seen to be round.
--> Ships Visibility: When ships travel a large distance away, we see their hulls disappear first and their masts disappear last.
-->Altitude of Polaris (North Star): The height of the North Star changes as we travel to different latitudes. That is ,increases as you move toward the North pole, or decreases as you move toward the equator.
--> Aerial photographs: Photographs of the Earth from space always show a round body.
The statement that doesn't prove that the earth is spherical in shape is (the Sun is seen blocking different constellations in the course of a year). The sun is seen in front of stars blocking different constellation in a year because the earth orbits round the sun in a year and not that it is shperical in shape.
When groups interact with one another, sometimes there is conflict. What is the BEST example of this type of group interaction?
A. Two classes work together to raise money for a local cause.
B. Two sports teams head to the football championship game.
C. Two countries go to war with one another.
D. Two departments exchange information in a meeting.
Answers
Answer: (D) Two countries go to war with one another.
Explanation: I checked.
the block is sitting at rest on teh floor . The normal force on the block is 3.00 N find the mass of the block
Answers
Answer:
m = 0.305 [kg]
Explanation:
When a body rests on a horizontal surface and is in balance we can say that normal force is the reaction of the weight of a body.
Weight is defined as the product of mass by gravitational acceleration.
[tex]N=W=m*g[/tex]
where:
N = normal force = 3 [N]
g = gravity acceleration = 9.81 [m/s²]
m = mass [kg]
Now replacing:
[tex]3=m*9.81\\m=0.305[kg][/tex]
