Answer:
it helps you estimate how hard you're working (your activity intensity). perceived exertion is how hard you think your body is exercising. ratings on the scale are related to heart rate (how hard your heart is working to move blood through your body).
Explanation:
Can someone answer these questions? Im really sorry for the long 15 questions but it would save me and basically my whole class.
Answer:
yes
Explanation:
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2. A compressed gas is held inside a canister with a moveable lid. The temperature of the gas is significantly
higher than the air temperature outside the canister. When weight is removed from the lid, the gas
expands to lift it. For this expansion to be as nearly adiabatic as possible, which condition should be met?
Answer:
Heat supplied should be equal to zero.
Explanation:
Given that a compressed gas is held inside a canister with a moveable lid. The temperature of the gas is significantly higher than the air temperature outside the canister. When weight is removed from the lid, the gas
expands to lift it.
For this expansion to be as nearly adiabatic as possible, one of the conditions that should be met is that there should be no supply of thermal or heat energy to the system.
According to first law of thermodynamics:
Change in internal energy = heat supply + work done by the system
If heat supplied = 0
Then, nothing is constant.
The internal energy = work done by the system.
Therefore, no heat should be supplied to the system.
We all have different strengths and weaknesses. How can you support others when they are better at something than you? How can you encourage others when you are better at a skill than they are?
Answer:
Tara zombix online magandang laro to
Select the correct answer from each drop-down menu.
Heat always flows from a
place to a
place.
Heat always flows through from a higher thermodynamic potential to lower thermodynamic potential.
What is thermodynamics?It can be defined as the branch of science that deals with the interactions of thermal energy across different system and their surroundings.Thermodynamics does not deal with the rate of energy interaction.The movement of the thermal energy depends on the thermodynamic potential of the respective objects or bodies in which the flow of the thermal energy is involved.
The thermodynamics potential is analogous to the electrical potential what is used to flow the current in the electrical circuit in the similar fashion the temperature gradient is the driving force that is used for the transfer of heat energy from a higher temperature potential to the lower to a temperature potential.
This natural flow of heat is valid only when any external work is not done on the thermodynamic system where transfer of heat taking place .
This principle of heat transfer is not applicable in the case of refrigerator and air-conditioner because in that case some external work is done on the system and is the natural driving force of heat transfer.
Hence,we can say that heat always flows through from a higher thermodynamic potential to lower thermodynamic potential unless until some external prime mover is provided for example in case of air conditioner.
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7. Roughly how much did the cost of PV solar panels decrease between 2008 and 2015?
40%
80%
60%
20%
US 0
the speed of propagation of seismic waves is about 4km/s an earthquake takes place in Turkey at 13:21:00 the center of the earthquake is at 500km from beirut
at waht time would a seismograph in beiurt rcord the earthquake?
Answer:
14:30:00
Explanation:
because the speed of propagation of seismic waves is at 500
4.Your friend tells you the weight of aparticular sample of chalk is 17.85 grams. Is there anything wrong with your friend ’statement?
A. No, because grams are the right units for weight.
B. No, because mass and weight are really the same thing.
C.Yes, because your friend should have reported the mass in kilograms.
D. Yes, because mass and weight are measured in different units
Answer:
A i tooook theee quizzz too
What is one source error associated with self-report inventories, and what is one of its solutions?
Answer:
Explanation:
One source error is deliberate deception, and one of its solutions is having a lie scale inserted into the assessment. Another source error is social desirability, and one of its solutions is locating questions sensitive to bias and changing or dropping them. Another source error is response set, and two of its solutions are using word variations and writing questions on the assessment in different ways.
are brought close together?
5. What happens when like magnetic poles
Answer:
When two magnets are brought together, the opposite poles will attract one another, but the like poles will repel one another. This is similar to electric charges. Like charges repel, and unlike charges attract.
What instrument is used to measure force?
1. Ruler
2. Balance
3. Spring scale
4. Barometer
What would scientists using classical, Newtonian physics expect to observe
during the photoelectric effect?
A. That enough light of any frequency would cause electrons to flow
O B. That light above a certain frequency would not cause electrons to
flow
O C. That no light would cause electrons to flow
O D. That light below a certain frequency would not cause electrons to
flow
Answer:
A. That enough light of any frequency would cause electrons to flow.
Explanation:
A P E X
Scientists using classical, Newtonian physics expect to observe the photoelectric effect because enough light of any frequency would cause electrons to flow.
What is the photoelectric effect?When a medium receives electromagnetic radiation, electrostatically charged particles are emitted from or inside it.
The emission of ions from a steel plate when light falls on it is a common definition of the effect. The substance could be a solid, liquid, or gas; and the released particles could be protons or electrons.
Scientists using classical, Newtonian physics expect to observe the photoelectric effect because enough light of any frequency would cause electrons to flow.
The flow of the electron is a must to understand the photo electric effect.
Hence option A is correct.
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If a machine exerts a force of 250N on an object and no work is done, what must have occurred?
Essential Question: How do different forces affect our daily experience? Think about us walking, gravity, etc.
Answer:
dd
Explanation:
I dont know I dont know I dont know I dont know
What happens to the current in the other two lamps
if one lamp in a three-lamp parallel circuit burns out?
Answer:
If one of the filaments burns out, the resistance and the potential difference across the other lamps will not change; therefore, their currents will remain the same.
Explanation:
Answer:
кпукнгпееагегпаммршолипWhy does an increase in temperature result in an increase in reaction rate?
Answer:
An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision.
Answer:
When we increase the temperature in a chemical reaction, this increases the particles kinetic energy, making them move much faster than they were before. This also increases collision between the particles and the rate of reaction.
A kid is bouncing on a pogo stick. He oscillates 22.0 times in 14.9 S. What is his frequency? (Unit = Hz)
Answer:
1.4765 Hz
Explanation:
right on acellus
The frequency of an event is the inverse of time period.The frequency of the kid on bouncing the pogo stick is 1.47 Hz.
What is frequency?Frequency of an event is is the number of occurance of that event in unit time. It is the inverse of time period of that event. Hence frequency has the unit of s⁻¹ which is equivalent to Hz.
The frequency of a wave is the number of wave cycles per unit time. Frequency is directly related to the energy of the vibration or wave. Hence, as the frequency increases, energy increases.
Given that, the number of oscillations from the bouncing of the pogo stick is 22 times in 14.9 seconds. Thus , number of oscillations in 1 second is:
22 /14.9 s = 1.47 Hz.
Therefore, the frequency of the event created by the kid is 1.47 Hz.
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The wave take 0.12 to reach the satellite. Calculate the height of the orbit of the communications satellite
Answer:
x = 3.6 10⁷ m
Explanation:
The speed of an electromagnetic wave is constant, in a vacuum its value is c = 3 10⁸ m / s, this speed decreases when entering a material medium,
v = c / n
where n is the refractive index, but in this case the refractive index of air is n = 1.00002. The refractive index of a vacuum is n = 1, so we can assume that the change in velocity is negligible.
For the calculation we can use the relations of the uniform motion
v = x / t
x = v t
let's calculate
x = 3 10⁸ 0.12
x = 3.6 10⁷ m
5. A standing wave in a clothesline has 4 nodes and 3 antinodes. The clothesline is 12 m long and is vibrating
at 0.50 vibrations per second. What is the speed of the wave?
Answer:
v = 4 m / s
Explanation:
In this exercise we are asked to find the speed of the wave, which is described by the expression
v = λ f
in this case the wave has 4 nodes and 3 antinodes, in a length of 12 m
for a standing wave it is satisfied that we have a full wavelength and a half of another
L = λ + ½ λ
L = [tex]\frac{3}{2}[/tex] λ
λ = ⅔ L
Cambien indicates that it has a frequency of
f = 0.5 Hz
we substitute
v = ⅔ L f
let's calculate
v = [tex]\frac{2}{3}[/tex] 12 0.5
v = 4 m / s
5. There is a bell at the top of a tower that is 45 m high. The bell's mass is 200 kg. The bell has energy. Calculate it.
45000
900000 J
9000 J
88200 J
Answer:
Explanation:
Since the bell is at rest in an elevated position, we can assume that it only has potential energy.
U=mgh is the formula for potential energy where U=potential energy, m= mass, g=acceleration due to gravity, and h=height.
Plug in known variables....
U=200kg*9.8m/s^2*45m
U=88200 joules of potential energy or letter D.
If one soccer ball is rolling to the right at 3 m/s and another soccer ball is rolling left with a speed of 5 m/s, how much momentum is there in this system before they collide with each other? Both have a mass of 1 KG
Answer:
Final momentum after a head on collision is -2kgm/
Explanation:
One ball moves to the right and the other moves opposite and momentum is a vector quantity so that considering the direction
Initial momenta are P₁=2x3=6kgm/s P₂=4x(-2)=-8kgm/s
Final momentum is the vector sum of P(final)= 6-8= -2 kgm/s
A disc whose moment of inertia is 1kgm² is rotating at 100 rad/sec. This disc is pressed against a similar disc that is able to rotate freely but is initially at rest. The two disc together and rotate as a unit. Determine the final angular velocity of the system.
it may help you have a great day
MC Qu. 82 A design engineer wants to construct a sample... A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results: Sample Service Life (hours) 1 495 500 505 500 2 525 515 505 515 3 470 480 460 470If he uses upper and lower control limits of 520 and 480 hours, what is his risk (alpha) of concluding servicelife is out of control when it is actually under control (Type I error)? A. 0.0026B. 0.0456C. 0.3174D. 0.6826E. 0.9544
Answer:
B) 0.0456
Explanation:
It is given that :
Rationale :
UCL = 480
LCL = 480
∴ Mean , [tex]$\bar X = 500$[/tex]
The standard deviation of sample (Sn) = 11.55
Z (for UCL) [tex]$=\frac{\text{UCL - Mean}}{\text{Sn}}$[/tex]
[tex]$=\frac{520-500}{10}$[/tex]
= 2
Similarly,
Z (for LCL) [tex]$=\frac{\text{LCL - Mean}}{\text{Sn}}$[/tex]
[tex]$=\frac{480-500}{10}$[/tex]
= -2
Now using the z table for finding the confidence level between Z value of -2 and 2.
Confidence level = 0.4772 + 0.4772
= 0.9544
Risk (alpha) = 1 - confidence level
= 1 - 0.9544
= 0.0456
A skier skies down a slope with an average speed of 50 km/s. How far does the skier travel in 5 minutes?
Answer:
15000000 m
Explanation:
From the question,
Speed (S) = Distance(d)/Time(t)
S = d/t....................... Equation 1
Make d the subject of the equation
d = St..................... Equation 2
Given: S = 50 km/s = 50000 m/s, t = 5 minutes = 5*60 seconds = 300 seconds
Substitute these values into equation 2
d = 50000(300)
d = 15000000 m
Hence the skier travels 15000000 m
What does this same experiment tell you about light waves? Explain the evidence that supports your claim.
Answer:
Light wave is an EM wave that can only be seen by humans New questions in Physics Engineers at the Space Centre must determine the net force needed for a rockets engine to achieve an acceleration of 70 m/s2.
Explanation:
The different shapes of the moon seen from Earth are called
Answer:
they are called phases of the moon.
The different shapes of the moon seen from Earth are called phases of moon
What is phases of moon ?The portion of the moon that we can see from the earth on any given night is called phases of moon . There are four phases of moon 1) new moon 2) first quarter 3) full moon 4) third quarter
The earth rotates around the sun and the moon rotates around the earth . so , now we know that moon is in between sun and earth , due to this orbiting the sunlight falls on moon and we see moon in the light of sun as we know moon does not have its own light . Because of this rotation sunlight fall at different angles because position of moon with respect to earth is changing constantly due to which different shapes has been observed from the earth's surface ,after being reflected that light reaches the earth and being observed by the observer on earth as moon having different shapes called its phases of moon.
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Activity: Is it the same?!
Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by scattering the reflected light rays in all directions.
Some of the earliest accounts of light reflection originate from the ancient Greek mathematician Euclid, who conducted a series of experiments around 300 BC, and appears to have had a good understanding of how light is reflected. However, it wasn't until a millennium and a half later that the Arab scientist Alhazen proposed a law describing exactly what happens to a light ray when it strikes a smooth surface and then bounces off into space.
In this activity you will be working as an engineer that is working to modify different kinds of digital cameras and to study the effect of changing incident angle on the reflected angle.
Method
Explain the steps of your experiment and identify the scientific variables:
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
• Independent Variable
----------------------------------------------------------------------------------------------------------------
• Dependent Variable
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
if anyone does ib myp 3. pleaseeee helppp im gonnnnaaa fail.
sciences by concept myp 3 formative assesment.
im giving 50 points please just help meeeeeeeeeeee
Answer:r other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by
Explanation:
Activity: Is it the same?!
Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by scattering the reflected light rays in all directions.
Some of the earliest accounts of light reflection originate from the ancient Greek mathematician Euclid, who conducted a series of experiments around 300 BC, and appears to have had a good understanding of how light is reflected. However, it wasn't until a millennium and a half later that the Arab scientist Alhazen proposed a law describing exactly what happens to a light ray when it strikes a smooth surface and then bounces off into space.
In this activity you will be working as an engineer that is working to modify different kinds of digital cameras and to study the effect of changing incident angle on the reflected angle.
Method
Explain the steps of your experiment and identify the scientific variables:
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
• Independent Variable
----------------------------------------------------------------------------------------------------------------
• Dependent Variable
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
if anyone does ib myp 3. pleaseeee helppp im gonnnnaaa fail.
sciences by concept myp 3 formative assesment.
im giving 50 points please just help meeeeeeeeeeee
Can a physical quantity have units but still be dimensionless?
Answer:
yes
Explanation:
there are other quantities that are dimensionless, but have a unit.
For example, radian is the unit for an angle. But it is dimensionless because it is defined to be the ratio of two lengths.,
a dimensionless quantity will always be independent of the base units — meter, second, kilograms, kelvin, candela, moles, ampere.
Other examples:
1. Mass fraction
2.Mole fraction
both have unit (kg/kg)
Answer:
A quantity that has dimensions must have units. Yes a quantity have units but still be dimensionless for example,unit of angle is radian ,but it is a dimensionless quantity. A dimensionless quantity may have unit. ... A unitless quantity never has a non-zero dimension.
I hope it's helpful!
PLEASE HELP !!
Elements in period 2 on the periodic table all have blank
electron shells.
Answer:
Two orbitals for their electrons and six in the 2p subshell
Explanation:
Hope this helps :)
4. An egg is thrown horizontally off the roof that is 60 meters high, with an initial velocity of
6.5m/s. How long does it take to hit the ground? How far does it go in the x direction?
Answer:
It will take 3.5s to reach the ground
Explanation:
A toy remote car drives in a circle. It makes 2 revolutions in 20 seconds. What is the period of the object?
Answer:
T = 10 seconds
Explanation:
Given that,
A remote car makes 2 revolutions in 20 seconds.
We need to find the period of the object.
It means, it will make [tex]\dfrac{2}{20}=0.1\ \text{revolutions/second}[/tex] .
lt T be the period of the object. So,
[tex]T=\dfrac{1}{0.1}\\\\T=10\ s[/tex]
It will take 10 seconds for one revolution.