Answer:
141 J
Explanation:
The lowest sig digits in a calculation determine the sig dig of the answer
The temps are listed with 3 significant digits and the spec heat is 3 sig digits (the mass has 4 sig digs) .....so answer will need 3 digits
31.91 g * .903 J/g-C * (26.1 - 21.2 C) = 141 J (three sig dig)
After an action potential, the opening of additional voltage-gated \text{________} channels and the inactivation of sodium channels, cause the membrane to return to its resting membrane potential.
After an action potential, the opening of voltage-gated potassium channels and Na channels causes the membrane to return to its resting membrane potential.
What is an action potential?An action potential is defined as a difference in electrical charges across the cell membrane due to the unequal distribution of ions.
An action potential is produced by potassium and sodium channels that allow the movement of positive ions across the membrane.
In conclusion, after an action potential, the opening of voltage-gated potassium channels and Na channels causes the membrane to return to its resting membrane potential.
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50. a kangaroo can jump over an object 2.50 m high. (a) calculate its vertical speed when it leaves the ground. (b) how long is it in the air?
Answer:
The easiest way to do this is to realize that the time to fall is the same as the rise time (conservation of energy can easily verify this)
S = 1/2 g t^2 time to fall 2.5 m
t = (5 / 9.8)^1.2 = .714 sec time in air
v = a t = 9.8 * .714 = 7 m/s initial vertical speed
Check:
S = v t - 1/2 g t^2 where v is the initial vertical speed
S = 7 * .714 - 4.9 * .714^2 = 2.5 m total vertical distance traveled
The fixed assets turnover ratio of gd products is 13. 6 and that of its competitor, ap goods inc. , is 6. 0. what does this financial data primarily imply?
The correct answer is GD Products collects receivables more quickly than AP Goods.
Analysts typically utilize the fixed asset turnover ratio (FAT) to gauge operating performance. This efficiency ratio assesses a company's capacity to generate net sales from its fixed-asset investments, specifically property, plant, and equipment (PP&E). It compares net sales (income statement) to fixed assets (balance sheet) (PP&E). Utilized as a net of accumulated depreciation is the fixed asset balance. A greater fixed asset turnover ratio shows that a business has utilized fixed asset investments to drive sales effectively. A greater ratio suggests that management is making better use of its fixed assets. No information can be gleaned from a high FAT ratio about a company's capacity to produce reliable earnings or cash flows.
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A wave of wavelength 1.2m travels 11.2m to a wall in 2s. what's the frequency of the wave
Answer: f = 4.67 Hz
Explanation:
We can approximate the wave as a traveling wave, therefore the speed of the wave is constant
v = d / t
the total distance remember, in going to the wall and back is
d = 2 11.2 = 22.4 me
we substitute
v = 22.4 / 4.0
v = 5.6 m / s
now we can use the relationship between the speed of the wave, its wavelength and u frequency
v =λ f
f = v /λ
f = 5.6 / 1.2
f = 4.67 Hz
Which statement about nuclear fusion is correct? A. Two hydrogen electrons become protons during fusion. B. Helium nuclei can fuse to form elements such as nitrogen.
C. The fusion reaction lasts for several hundred years. D. Large nuclei break apart to form smaller nuclei.
Answer:
A is the answer
Explanation:
Yes, Two hydrogen electrons become protons during fusion.
By far, the most common fusion reaction in nature combines two hydrogen atoms to make a helium atom.
Answer:
B
Explanation:
A no
B Yes ....can fuse all the way up to making Iron
C no
D no .... the opposite
A stone that is thrown vertically upwards was having a velocity of 15m/s after reaches 2/3 of its maximum height. What is the maximum height that can be reached by the stone?
A. 9.8m
B. 11.5m
C. 22.9m
D. 34.4m
The correct answer is option B. The maximum height that can be reached by the stone is determined as 11.5 m.
Maximum height attained by the stoneThe maximum height attained by the stone when it is a 2/3 of its total height is calculated as follows;
v² = u² - 2gh
where;
v is final velocity at maximum height, v = 0u is initial velocityg is acceleration due to gravity0 = u² - 2gh
2gh = u²
h = u²/2g
h = (15²)/(2 x 9.8)
h = 11.48 m
h = 11.5 m
Thus, the maximum height that can be reached by the stone is determined as 11.5 m
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A proton travels with a speed of 8. 34×10^5 m/s at an angle of 32. 3° with the direction of a magnetic field. the field exerts a force of 3. 00×10^−17 n on the proton. What is the strength of the field?
Magnetic field strength of the field is 4.2 × [tex]10^{-4}[/tex] T
What is Magnetic Field ?The region of space where magnetic force is experienced is known as magnetic field.
The force on a particle of charge q moving at speed v at an angle Ф to a uniform magnetic field of flux density B is given as
F = BqvsinФ
Given that a proton travels with a speed of 8. 34×10^5 m/s at an angle of 32. 3° with the direction of a magnetic field. the field exerts a force of 3. 00×10^−17 N on the proton. What is the strength of the field?
The parameters are;
Force F = 3.0 × 10^−17 NSpeed V = 8.34 × 10^5 m/s Angle Ф = 32. 3°Magnetic field strength B = ? Proton charge = 1.6 x [tex]10^{-19}[/tex] CSubstitute all the parameters into the formula
F = BqvsinФ
3.0 × [tex]10^{-17}[/tex] = ( 1.6 x [tex]10^{-19}[/tex] x 8.34 x [tex]10^{5}[/tex] x sin 32.3 ) B
3.0 × [tex]10^{-17}[/tex] = 7.13 × [tex]10^{-14}[/tex] B
Make B the subject of formula
B = 3.0 × [tex]10^{-17}[/tex] / 7.13 × [tex]10^{-14}[/tex]
B = 4.2 × [tex]10^{-4}[/tex] T
Therefore, Magnetic field strength of the field is 4.2 × [tex]10^{-4}[/tex] T
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What happens to heat energy when it is not increasing the temperature of the substance in the beaker? use your heating curve to explain your answer
When heat energy is not increasing the temperature of the substance in the beaker, the heating curve will start to increase and then flatten as it melts and is a solid with liquid.
What is Heating curve?This can be referred to as a type of graph which shows the relationship between the heating system supply temperature and the outside air temperature.
The heat energy not being able to increase the temperature is the reason why there will be solid present in the liquid. This is as a result of it not reaching its required melting point which is why all the substances aren't melted and is therefore the most appropriate choice.
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In a similar rolling race (no slipping), the two objects are 2 solid cylinders of the same mass but different radii. which reaches the bottom first?
The solid cylinder reaches the bottom first.
A (solid) cylinder is a solid that has two parallel planes and a cylindrical surface surrounding it. An element of the cylinder is a line segment that is determined by an element of the cylindrical surface between two parallel planes. A cylinder's components are all the same length. The material's velocity would be higher if the moment of inertia was lower and the radius of gyration k was smaller. In comparison to a hollow cylinder with k as 1, a solid cylinder with k as 1/2 will move at a faster speed. Their energies at both levels, including potential energy and energy lost through friction, would stay the same because they had the same mass and radius.
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A solid cylinder and a hollow cylinder of the same mass and radius, both initially at rest, roll down the same inclined plane without slipping. Choose the correct options.
The solid cylinder reaches the bottom first.
A solid object will always roll down the ramp faster than a hollow object of the same shape regardless of their exact mass or diameter.
The solid cylinder has a lower moment of inertia than the hollow one does. Although they have the same mass, all the hollow cylinder's mass is concentrated around its outer edge so its moment of inertia is higher.
The velocity would be greater for the material with radius of gyration k is lower of for which the moment of inertia is lower. Solid cylinder with k as 1/2 will have greater velocity as compared to hollow cylinder which has k as 1. As they have same mass and radius their energies at both the levels would remains same including the potential energy and energy lost due to friction.
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After traveling for 6.0 seconds, a runner reaches a speed of 12 m/s after starting
from rest. What is the runner's acceleration?
A. 2 m/s²
OB. 72 m/s²
C..5 m/s²
D. 6 m/s²
Answer:
A
Explanation:
accel = Δv / Δ t = 12/6 = 2 m/s^2
Find the distance traveled by a particle with position (x, y) as t varies in the given time interval. x = 2 sin2(t), y = 2 cos2(t), 0 ≤ t ≤ 4
The distance traveled by the particle at the given time interval is 0.28 m.
Position of the particle at time, t = 0
The position of the particle at the given time is calculated as follows;
x = 2 sin2(t)
y = 2 cos2(t)
x(0) = 2 sin2(0) = 0
y(0) = 2 cos2(0) = 2(1) = 2
Position of the particle at time, t = 4x = 2 sin2(t)
y = 2 cos2(t)
x(4) = 2 sin2(4) = 0.28
y(4) = 2 cos2(4) = 2(1) = 1.98
Distance traveled by the particle at the given time intervald = √[(x₄ - x₀)² + (y₄ - y₀)²]
d = √[(0.28 - 0)² + (1.98 - 2)²]
d = 0.28 m
Thus, the distance traveled by the particle at the given time interval is 0.28 m.
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A ball is gently dropped from a height of 20 m onto a hard surface where it make an elas
1) Show that the speed of the ball just before hits the ground is 20m/s (g=10m/s2)
2) Why isn’t the accelera
3) Use axes below to sketch a graph of how the velocity of the ball varies with
several bounces
Answer:
20 m/s
Explanation:
Use the position/displacement formula to find out how long the ball is in the air:
(distance) = (initial velocity)*(time) + (1/2)*(acceleration)*(time)^2
20 = 0*t + 1/2*10*t^2
t^2 = 4
t = 2 seconds
Use the velocity formula:
(final velocity) = (initial velocity) + (acceleration)*(time)
Vf = 0 + 10*2
Vf = 20 m/s
An immersion heater has a power rating of 1500 watts. it is used to heat water for coffee. how long (in minutes) should it take to bring 0. 7 l of water from room temperature (20°c) to 80°c?
1.96 minutes long should it take to bring 0. 7 l of water from room temperature (20°c) to 80°c.
To find the answer, we have to know about the heat energy.
How to find the time taken to raise the temperature?It is given that,[tex]Power,P=1500W\\Volumw, V=0.7L\\T_1=20^0C \\T_2=80^0C[/tex]
We have to find mass of water first, and the expression is,[tex]m=\rho V=1kg/L*0.7L=0.7kg[/tex]
Heat energy required to raise the temperature from 20 to 80 degree Celsius is,[tex]Q=mc\Delta T=0.7*4182(80-20)\\Q=1.76*10^5J[/tex]
where, c equals to 4182J/kg°C.
This energy can be related with power and then the time will be,[tex]t=\frac{E}{P} =\frac{1.76*10^5}{1500} =117.3s=1.96minutes.[/tex]
Thus, we can conclude that, 1.96 minutes long should it take to bring 0. 7 l of water from room temperature (20°c) to 80°c.
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You start walking from a point on a circular field of radius 0.5 km and 1 hour later
you are at the same point. What is your average speed for the whole journey?
Answer:
1). average velocity= displacement/time
= here displacement is zero
= 0/1
= 0 m/s
2). average speed= total distance/time
=2πr/1
=(2×22/7×5/10)/1
22/7
3.14 km/h
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Explanation:
Answer:
[tex]\sf \fbox{speed = 3.14 kmph}[/tex]
Explanation:
Given:
Radius of circular field (r) = 0.5 Km
Time taken to complete one round of field (t)= 1 hour
To find:
Average speed for the whole journey=?
Solution:
To find the average speed we will have to find the actual distance covered in given time, & the actual distance covered would be equal to the
[tex] \sf \: perimeter \: of \: circular \: field = 2 \pi r \\ \sf 2 \pi r = 2 \times 3.14 \times 0.5 = 3.14 \: km[/tex]
Distance covered in 1 hour is 3.14 km,
[tex]\small \sf Average \: speed = \frac{Distance}{Time} = \frac{3.14}{1} \\ \small \sf \fbox{speed = 3.14 kmph}[/tex]
[tex] \small\sf \: Thanks \: for \: joining \: brainly \: community! [/tex]
Calculate the frequency of the green light emitted by a hydrogen atom with a wavelength of 486. 1 nm.
The frequency of the green light emitted by a hydrogen atom with a wavelength of 486. 1 nm will be 6.17 * [tex]10^{-14}[/tex] Hz
The wavelength of light is the distance between corresponding points in two adjacent light cycles, and the frequency of light is the number of cycles of light that pass a given point in one second.
Visible light falls in the range of the EM spectrum between infrared (IR) and ultraviolet (UV). It has frequencies of about 4 × 1014 to 8 × 1014 cycles per second, or hertz (Hz) and wavelengths of about 740 nanometers (nm) or 2.9 × 10−5 inches, to 380 nm (1.5 × 10−5 inches)
f = c/lambda
where
f = frequency of light = ?
lambda = wavelength of light = 486. 1 nm = 486.1 * [tex]10^{-9}[/tex] m
c = speed of light = 3 * [tex]10^{8}[/tex] m/s
f = 3 * [tex]10^{8}[/tex] / 486.1 * [tex]10^{-9}[/tex] = 6.17 * [tex]10^{-14}[/tex] Hz
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Peripheral vision is the sharpness of your eyesight that is very important in driving a vehicle? true or false?
True.
Peripheral vision is very important in driving a vehicle.
What is peripheral vision?Peripheral vision is the area of your field of vision that is not directly in front of you. You can keep your eyes on what's in front of you while using peripheral vision to see when other automobiles are passing you. For example, peripheral vision can tell you when it's safe to cross a street, when a pedestrian is attempting to cross, or when you need to go to the car wash because a bird just peed on your window.
Peripheral vision works in conjunction with central vision to help you make informed driving decisions. You can spot potential dangers before they enter your field of vision by using your peripheral vision.
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What is a supply chain designed to optimize both forward and reverse flows?
a. open-loop supply chain
b. closed-loop supply chain
c. bullwhip-loop supply chain
d. reverse-loop supply chain
The correct option is b. closed-loop supply chain
Closed-loop supply chain is designed to optimize both forward and reverse flows.
What is closed-loop supply chain?Businesses recycle their waste volume to make new products in such a closed-loop supply chain. This method of resource conservation and energy conservation is sustainable.
Some characteristics of closed-loop supply chain are-
Although there are many natural resources on the planet, such as freshwater and oil, they are limited and will eventually run out. Fortunately, numerous governments all across the world have created and put into effect ways to lessen resource waste.Likewise, companies can contribute to the preservation of natural resources by implementing the closed-loop supply chain (CLSC). The appeal of a CLSC or negligible supply chain is that it centers on material reuse, composting, and recycling. As a result, the closed-loop supply chain encourages manufacturers to come up with creative uses for End-of-Life (EOL) products rather than disposing of them in landfills.To know more about supply chain, here
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An airplane flies with a velocity of 55.0 m/s [35o N of W] with respect to the air (this is known as air speed). If the velocity of the airplane according to an observer on the ground is 40.0 m/s [53o N of W], what was the wind velocity?
The wind velocity of the plane in discuss can be evaluated by means of the air velocity if the plane and the observed velocity is; 20.98m/s.
What is the wind velocity of the according to the observed velocity?It follows from the task content that the air velocity of the plane in discuss is; 55.0 m/s [35o N of W] while the observed velocity is; 40.0 m/s [53o N of W].
Hence, the components of both velocities can be evaluated as follows;
55.0 m/s [35o N of W] = (55cos35, 55sin35) = (45.05, 31.55)
40.0 m/s [53o N of W] = (24.07, 31.95)
Hence, the wind velocity can then be evaluated as follows;
Wind velocity = (24.07 - 45.05, 31.95- 31.55)
Wind velocity = (-20.98, 0.40)
The wind velocity would therefore have a magnitude of; √(-20.98)² + (0.40)²
= 20.98 m/s.
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When measuring a condominium you should calculate ____ using _______ measurements.
When measuring a condominium you should calculate GLA using interior measurements.
What is condominium?A condominium is an individually owned home surrounded by other homes.What is GLA?GLA stands for Gross Living Area
The GLA is the "total area of finished, above-grade residential space; computed by measuring the outer perimeter of the structure and comprises only finished, habitable, above-grade dwelling space," according to The Dictionary of Real Estate Appraisal.How is GLA calculated?To determine a property's above-grade gross living area, the appraiser should divide the external building dimensions by the number of floors. (The below-grade area is likewise subject to the measuring process)The appraiser should utilize interior perimeter unit dimensions to determine the gross living area for units in condo or co-op structures.Basements and garages, even those that are partially above-grade, are not to be counted in the number of rooms above grade.Pros of condominium:Lower-maintenance livingSense of securitySocializing opportunitiesAffordabilityAmenitiesCons of condominium:HOA rulesInvestment riskHigher interest ratesLack of privacyLimited outdoor spaceRising HOA feesSpecial assessmentsRestrictive rental policiesTo learn more about condominium visit:
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What is the free energy of activation of a one-step reaction? how is it qualitatively related to the rate constant of the reaction?
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The development and use of alternative energy source is very necessary in present day world. Explain this statement.
Answer:
In today's world pollution is very high so alternative energy such as solar energy help us to make pollution free world. So it is necessary to use alternative energy.
If mass (M), Velocity (V) and length (L) are considered as fundamental quantities in certain system of unit. Find the dimensional formula for force.
Answer:
Explanation:
MLT^-2
.....
Examine Figure 1. During the process of beta decay, which statement correctly compares the parent nucleus and the daughter nucleus?
A
The parent has a different mass number than the daughter.
B
The parent has a different atomic number than the daughter.
C
The parent has the same number of neutrons as the daughter.
D
The parent has the same number of electrons as the daughter.
Beta decay forms a daughter nucleus with a different atomic number than the parent nucleus. The correct answer is option B.
A nucleus loses an electron when it emits the beta particles. The parent and daughter nuclei share the same atomic mass because the mass of an electron is so much less than that of a proton or neutron. The offspring nucleus has an atomic number that is one higher than the parent nucleus.
There are mainly two types of beta decay: beta plus (positron decay) and beta minus (electron decay). The daughter atomic number reduces by one after beta plus decay (the nucleus loses one positive charge) and rises by one after beta minus decay (the nucleus loses one negative charge).
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A particle moving in a straight line with uniform deceleration has a velocity of 40m/s at point P, 20m/s at point Q
and comes to rest at point R where QR=50m .Calculate the
1.Distance PQ
2.Time taken to cover PQ
3.Time taken to cover PR
The distance between PQwill be 10,time taken to cover PQ will be 0.25sec and time taken to cover PR will be 3sec.
What is uniform deceleration?
Uniform deceleration is when velocity decrease by equal intervals of time .
Given ,
Velocity at P is 40 m/ s,
Velocity at Q is 20 m/ s
Distance between QR will be 50m.
let the whole distance between PR will be x,
so time taken of PQ, equating both times of PQ and QR we will get this,
x-50/40 = 50/ 20
after calculating ,
x = 60m , this the distance of whole straight line
60-50=. 10 m
the distance between PQ will be 10
2) time taken to cover PQ
. V= d/ t
t= 0.25s
3) time taken to cover PR
20=60/ t
t= 3sec.
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1. PQ=150m.
2. PQ: [tex]t=5s[/tex]
3. QR: [tex]t=5s[/tex]
What is velocity?The vector quantity velocity (v), denoted by the equation v = s/t, quantifies displacement (or change in position, s) over the change in time (t). Speed (or rate, r) is a scalar number, denoted by the equation r = d/t, that quantifies the distance traveled (d) over the change in time (t).
QR=50m.
[tex]V_{Q} (u)=20ms^{-1} ,V_{R} v[/tex]
[tex]v^{2} =u^{2}+2as[/tex]
[tex]0=20^{2} +2a*50[/tex]
100a=-400
[tex]a=-4ms^{-2}[/tex]
1. Distance PQ:
[tex]u_{p} (u)=40msx^{-1} , v_{Q (v)=20ms^{-1}[/tex]
[tex]v^{2} =u^{2} +2as[/tex]
[tex]20^{2} =40^{2} -2*4s[/tex]
400=1600-400
8s=1600-400
[tex]s=\frac{1200}{8} =150m[/tex]
PQ=150m
2.Time taken to cover PQ:
v=u+at
20=40-4t
4t=40-20
[tex]t=\frac{20}{4}=5s[/tex]
3. Time taken to cover PR:
v=u+at
0=20-4t
[tex]t=\frac{20}{4}=5s[/tex]
1. PQ=150m.
2. PQ: [tex]t=5s[/tex]
3. QR: [tex]t=5s[/tex]
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A 7.2 magnitude earthquake, with an epicenter in Northern Mexico, was felt over 100 miles away in Southern California because waves generated by earthquakes
A
do not require a medium to propagate.
B
travel away from the epicenter with no interference.
C
carry energy through Earth's crust.
D
can be measured on a Richter scale.
Answer:
B
because waves generated
a girl standing on her heel exert more pressure on the ground than an elephant standing flat on its feet. Give reasons
Answer:
The pressure exerted by a women wearing shoes with pointed heels is much greater than what an elephant with one foot can exert on ground. This because of lesser area of contact of pointed heels.
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The index of refraction of the core of a typical fiber optic is ncore = 1. 46; the cladding has nclad = 1. 4. calculate the critical angles for the total internal reflection icrit and crit
critical angle = [tex]i_{cr}[/tex] = 73.7°
total internal reflection = [tex]\alpha[/tex]cr = 54.58°
Given:
refractive index of core, [tex]n_{core}[/tex] = 1.46
refractive index of clad, [tex]n_{clad}[/tex] = 1.4
The incidence angle that causes the refraction angle to be equal to that at that angle of incidence is known as the critical angle.
The incidence angle needs to be greater than the critical angle for Total Internal Reflection to happen.
Now, we know that the critical angle = θcr is given by:
sinθcr = [tex]\frac{n_{clad} }{n_{core} }[/tex]
θcr = [tex]sin^{-1}[/tex] ([tex]\frac{n_{clad} }{n_{core} }[/tex])
θcr = [tex]sin^{-1}[/tex] ([tex]\frac{1.4}{1.46}[/tex])
= [tex]sin^{-1}[/tex](0.96)
=73.7° = [tex]i_{cr}[/tex]
Now for [tex]\alpha[/tex]cr:
[tex]sini_{cr}[/tex]/[tex]sin\alpha _{cr}[/tex] = 1/[tex]n_{core}[/tex]
[tex]sin\alpha _{cr}[/tex] = sin(90° - 73.7°) × 1.46
[tex]sin\alpha _{cr}[/tex] = sin(16.3°) × 1.46
=-0.558 × 1.46
=-0.815
[tex]\alpha _{cr}[/tex] = [tex]sin^{-1}[/tex](0.815)
= 54.58°
What is total internal reflection?full refraction of a light ray from the surrounding surfaces back into a medium like glass or water. If the incidence angle exceeds a specific limitation angle known as the critical angle, the phenomenon will manifest.Why is total internal reflection termed that?Total internal reflection means that none of the light that might conceivably travel away from this surface is refracted and that all of it is reflected.
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Are there components of the velocity that are not determined by the measurement of the force?.
Are there components of the velocity that are not determined by the measurement of the force?. Yes
What are components of velocity?
Due to the possibility of velocities pointing diagonally, two-dimensional motion is more complicated than one-dimensional motion. A baseball, for instance, could be going diagonally while also moving both horizontally and vertically. To make our calculations simpler, we divide the velocity vector of the baseball into two independent horizontal start subscript and end subscript directions.
It is challenging to attempt to solve for both the horizontal and vertical directions of a baseball in a single equation; it is preferable to use a divide-and-conquer strategy.
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Driving safely at night requires seeing well not only in low light conditions, but also being able to see low contrast
Answer:
True
Explanation:
Driving safely at night requires seeing well not only under low light, but also requires drivers to see low-contrast objects.
A lorenz curve represents the cumulative percentage of total income received along the ________ and the cumulative share of population along the ________
A lorenz curve represents the cumulative percentage of total income received along the horizontal axis and the cumulative share of population along the vertical axis.
The distribution of the cumulative percent of occurrences by the cumulative percent of population is shown graphically by the Lorenz Curve. By expanding the neighbourhood income quintile group, the horizontal axis (x-axis) of the curve shows the cumulative percent of persons in the population, and the vertical axis (y-axis) shows the cumulative percent of events in the population.
The Lorenz curve can be described as the proportion of the population that the neighbourhood income quintile represents holding the proportion of population events.
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