Answer:
https://stats.stackexchange.com/questions/454120/how-can-i-calculate-uncertainty-of-the-mean-of-a-set-of-samples-with-different-u
Explanation:
Why does Venus have the largest gravitational attraction to the sun compared to the other inner planets?Write your Claim below:
the force of gravity is proportional to the mass of an object and inversely proportional to the square of the distance between the objects.
HELP PLEASE
Which is true about the price of sustainable buildings?
It is generally less expensive over the lifetime of the building, due to lower energy costs in production of the materials and lower energy bills,
It is almost always less expensive upfront because insulation is so inexpensive.
It is almost always more expensive, but businesses choose to construct them anyway because climate change is a priority for them.
It is generally more expensive over the lifetime of the building, which is an issue that should be weighed in a cost-benefit analysis.
Sustainable buildings are generally less expensive over the lifetime of the building, due to lower energy costs in production of the materials and lower energy bills. Option A is correct.
What is sustainable buildings?Sustainable buildings refer to both a structure and the implementation of environmentally responsible and resource-efficient methods.
Sustainable buildings are generally less expensive over the lifetime of the building, due to lower energy costs in production of the materials and lower energy bills,
Hence,option A is correct.
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Choose the best answer among the given alternative answers. 1. Two opposite forces acting perpendicular to an axis cause a. Back and forth motion c. Sliding motion b. Rotation d. No motion (at rest)
2. The part of an electric motor that reverses current in a segment of the coil is. a. Armature c. Brushes b. Commutator d. Battery that makes the
Answer:
C
Explanation:
Calculate the amount of current flowing through a circuit when the resistance is 2 ohms and the voltage supplied is 10 Volts.
Select all the correct answers. which two statements are true about all generators? they convert motion energy to electric energy. they have a fixed pair of magnets and a rotating metal coil. they’re powered by fossil fuels. they convert electric energy to motion energy. they use the relative motion of a magnet and a coil of wire.
The two correct statements about generators are, they convert motion energy to electric energy and they use the relative motion of a magnet and a coil of wire.
What are generators?Generators are devices which convert mechanical energy into electrical energy.
Generators work by the laws of electromagnetism.
There are two types of generators, A.C. and D.C. generators.
Therefore, the two correct statements about generators are, they convert motion energy to electric energy and they use the relative motion of a magnet and a coil of wire.
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Abdul, while driving to school, computes the average speed for his trip to be 20 km.h–1. On his return trip along the same route, there is less traffic and the average speed is 30 km.h–1. What is the average speed for Abdul’s trip?
Calculate the molar mass of sucrose:
Answer:
342 g/mole
Explanation:
Mass of the carbon = 12 g
Mass of the hydrogen = 1 g
Mass of the oxygen = 16 g
Given: Chemical Formula of the Sucrose = C12H22O11
Molar mass = 12 x 12 + 1 x 22 + 16 x 11
= 144 + 22 + 176
= 320 + 22
= 342 g/mole ➪ molar mass of the sucrose
342 g.
Explanation:
C12H22O11 ------> SugarCarbon has mass -> 12
Hydrogen has mass -> 1
Oxygen has mass -> 16
=> (12× 12 ) + (1 ×22 ) + ( 16 × 11 )
=> 144 + 22 + 176
=> 342 gram
__________________Molecular mass : The Molecular mass of a substance is the sum of the atomic masses of all atoms in a molecule of a substance, e.g ., Molecular mass of water is 18u.H2O = 2 × H + 1 × O=> 2 × 1 + 1 ×16 = 2+16= 18 u. Mass of one mole of a substance is called its molar mass. ___________________what is a Molecule?
A Molecule is the smallest Particle of an element or a compound capable of independent existence under ordinary conditions. It shows all the properties of tge substance.1.
List the kinds of objects that exist outside our solar system, but are still in our galaxy.
2.
List the kinds of objects that exist in deep space beyond our galaxy.
Answer:
1. Stars, Nebula, Exo Planets, Star Clusters
2. Galaxies, Magelnic Clouds, Voids
Explanation:
Studying Astronomy for Years hope this helps and if you need more than this basic run down let me know have a great night!
what do you mean by impulse ratio?
How far did an object travel if they rode a bike at 15m/s for 5 seconds?
A. 75m
B. 3 m/s
C.20 m
Answer:
A) 75m
Explanation:
distance = speed x time taken
Here given:
speed: 15 m/s
time: 5 second
So, distance covered:
15 x 5
75 m
Distance
Speed×Time15(5)75mderive a relation between critical angle and refractive index of a substance
Answer:
Explanation:
Refractive index of denser medium w.r.t rarer medium
[tex]r[/tex]ч[tex]d[/tex][tex]=\frac{1}{sini_{c} }[/tex]
where, [tex]i_{c}[/tex] = critical angle
how much work is done on a small car if a 3000 N force is exerted to move it 75 m to the side of the road ?
Answer:
Soln,
force=3000 N
distance=75 m
we know that,
work done= force × distance
= 3000× 75
= 225000 joule
Show that the square of the period of revolution of a satellite is directly proportional to the cube of the orbital radius
Answer:
Explanation:
Why is it important to assess flexibility both before and during a workout regimen? a. to assess flexibility progress b. to keep muscles warm c. to establish flexibility baselines d. none of the above please select the best answer from the choices provided. a b c d
It important to assess flexibility both before and during a workout regimen because to assess flexibility progress.
What is a flexibility exercise?Flexibility exercises, as the name implies, help to increase the stretch of the muscles, improving the range of motion. More flexibility is also important to help prevent possible post-workout soreness.
In this case we have that the reason to continue doing stretching before and during the exercises is about to assess flexibility progress.
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Answer:
A
Explanation:
The brakes on a 17,600 N car exert a stopping force of 650. N. The car’s velocity changes from 25.0 m/s to 0 m/s.
a) What is the car’s mass?
b) What was its initial momentum?
c) What was the change in momentum for the car? d) How long does it take the braking force to bring the car to rest?
(a) The mass of the car is 1,795.92 kg
(b) The initial momentum of the car is 44,897.96 kgm/s.
(c) the change in momentum for the car is 44,897.96 kgm/s..
(d) The time it takes the braking force to bring the car to rest is 69.4 s.
Mass of the carThe mass of the car is calculated as follows;
W = mg
m = W/g
m = (17,600)/9.8
m = 1,795.92 kg
Initial momentum of the carPi = mvi
Pi = 1,795.92 x 25
Pi = 44,897.96 kgm/s
Change in momentum of the carΔP = Pf - Pi
ΔP = 0(1,795.92) - 44,897.96 kgm/s
ΔP = - 44,897.96 kgm/s
Time taken for the car to come to restF = ma
-650 = 1,795.92(a)
a = -650/1,795.92
a = -0.36 m/s²
v = u + at
0 = 25 - 0.36t
0.36t = 25
t = 69.4 s
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Which two elements undergo fusion in the sun?
Answer:
In the core of the Sun hydrogen is being converted into helium. This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom. During the process some of the mass is converted into energy.
A student measures the weight of one bottle cap as 5.03 grams, so he calculates that the weight of 100
bottle caps will be 503 grams. The actual weight of 100 bottle caps is 495 grams. What is the student's percent error?percent error?
The blackbody curve for a star named Zeta is shown below. The most intense radiation for this star occurs in what spectral band?
radio waves
infrared
visible light
microwaves
Answer:Visible lighlight
Explanation:
Two students are observing the motion of a Mercedes Benz. They calculate, with various handy dandy gadgets, that the Benz is changing its speed constantly by 2.2 m/s every second while moving along a straight road.
Student 1: The Benz is traveling at a constant velocity. Therefore at the end of 2 seconds it's speed will still be 2.2 m/s.
Student 2: No, the Benz is not traveling at constant velocity. At the end of two seconds the speed would have increased by 4.4 m/s.
Which student do you agree with and why? Discuss all parts of all statements made by both students. Saying I agree with student 1 or 2 or neither will not suffice.
Student 2 is correct. The Benz is not traveling at constant velocity. At the end of two seconds the speed would have increased by 4.4 m/s.
Final velocity of the Benz
The final velocity of the benz is determined by using first kinematic equation;
v = u + at
where;
u is the initial velocitya is the final velocity = (2.2 m/s) / 1s = 2.2 m/s²t is the timev = 2.2 + (2.2 x 2)
v = 6.6 m/s
Change in velocityΔv = 6.6 m/s - 2.2 m/s = 4.4 m/s
Thus, student 2 is correct. The Benz is not traveling at constant velocity. At the end of two seconds the speed would have increased by 4.4 m/s.
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name the quantity whose unit is 'newton'
A certain light truck can go around a flat curve having a radius of 150 m with a maximum speed of 32.5 m/s. With what maximum speed can it go around a curve having a radius of 66.0 m
Answer:
Approximately [tex]21.6\; {\rm m\cdot s^{-1}}[/tex], assuming that the coefficient of kinetic friction between the tires and the ground stays the same.
Explanation:
Let [tex]\mu_{k}[/tex] denote the coefficient of kinetic friction between the tires and the ground.
Let [tex]m[/tex] denote the mass of the truck. Let [tex]g[/tex] denote the gravitational field strength. The weight of this truck would be [tex]m\, g[/tex]. Since the curve is flat, the magnitude of the normal force [tex]F_\text{normal}[/tex] between the truck and the ground would also be [tex]m\, g\![/tex].
Let [tex]v = 32.5\; {\rm m\cdot s^{-1}}[/tex] denote the speed at which the truck goes around the curve with a radius of [tex]150\; {\rm m}[/tex]. The (horizontal) centripetal acceleration of the truck would be:
[tex]\displaystyle a = \frac{v^{2}}{r}[/tex].
The horizontal net force on the truck (of mass [tex]m[/tex]) would need to be exactly:
[tex]\displaystyle F_\text{net} = m\, a = \frac{m\, v^{2}}{r}[/tex].
The friction between the tires of the truck and the ground is the only horizontal force on the truck. Thus, this friction would need to supply the entirety of this horizontal net force:
[tex]\displaystyle F_\text{friction} = F_\text{net} = \frac{m\, v^{2}}{r}[/tex].
Notice that increasing [tex]v[/tex] would require an increase in the kinetic friction between the truck, [tex]F_\text{friction}[/tex]. However, since [tex]F_\text{friction}\![/tex] is at most [tex]\mu_{k}\, F_\text{normal}[/tex] (which is equal to [tex]\mu_{k}\, m\, g[/tex]):
[tex]\begin{aligned}\frac{m\, v^{2}}{r} &= F_\text{friction} \\ & \le \mu_{k}\, F_\text{normal} \\ &= \mu_{k}\, m\, g\end{aligned}[/tex].
Therefore, when the radius of the curve is [tex]r^{\prime}[/tex], the maximum velocity of this truck would be:
[tex]\begin{aligned}v^{\prime} &= \sqrt{\mu_{k}\, g\, r^{\prime}}\end{aligned}[/tex].
Likewise, it is possible to express [tex]\mu_{k}[/tex] in terms of [tex]r[/tex], [tex]g[/tex], and max speed [tex]v[/tex]:
[tex]\displaystyle \mu_{k} = \frac{v^{2}}{r\, g}[/tex].
Substitute this expression for [tex]\mu_{k}[/tex] back into the expression for [tex]v^{\prime}[/tex]:
[tex]\begin{aligned}v^{\prime} &= \sqrt{\mu_{k}\, g\, r^{\prime}} \\ &= \sqrt{\frac{v^{2}}{r\, g}\, g\, r^{\prime}} \\ &= \sqrt{v^{2}\, \frac{r^{\prime}}{r}}\end{aligned}[/tex].
Given that [tex]v = 32.5\; {\rm m\cdot s^{-1}}[/tex], [tex]r = 150\; {\rm m}[/tex], and [tex]r^{\prime} = 66.0\; {\rm m}[/tex]:
[tex]\begin{aligned}v^{\prime} &= \sqrt{v^{2}\, \frac{r^{\prime}}{r}} \\ &= \sqrt{(32.5\; {\rm m\cdot s^{-1}})^{2} \times \frac{66.0\; {\rm m}}{150\; {\rm m}}} \\ &\approx 21.6\; {\rm m\cdot s^{-1}}\end{aligned}[/tex].
A car is accelerated from rest to a speed of 20km/hr to 40 km/hr. Compared to the energy required to go from rest to 20km/hr, the energy required to go from 20km/hr to 40 km/hr is...
Answer:
678908765456789
Explanation:
A child pulls on a wagon with a force of if the wagon moves a total of in what is the average power delivered by the child?
Given the force exerted by the child to pull the Wagon through the given distance and time, the average power delivered by the child is 16.9 Watts.
This question is incomplete, the complete question is:
A child pulls on a wagon with a force of 75N. If the wagon moves a total of 42m in 3.1min, what is the average power delivered by the child?
What is Power?Power is simply the amount of energy transferred or converted per unit time.
It is expressed as;
P = W/t
Where W is work done and t is time elapsed.
But Work done is expressed as;
W = F × d
Where F is force applied and d is distance covered.
Hence;
Power = W/t = Fd / t
Given that;
Force exerted F = 75N = 75kgm/s²Distance covered d = 42mTime elapsed t = 3.1min = ( 3.1 × 60)s = 186sAverage power delivered P = ?Power = Fd / t
Power = ( 75kgm/s² × 42m ) / 186s
Power = (3150kgm²/s²) / 186s
Power = 16.9 kgm²/s³
Power = 16.9 Watts
Given the force exerted by the child to pull the Wagon through the given distance and time, the average power delivered by the child is 16.9 Watts.
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PLEASE HELP ME!
For each equation, state the reaction type and then balance the equation.
___Na3PO4 + ___HCl → _ __H3PO4 + ___NaCl
___KClO3 → __O_KCl + ___O2
#1
Double displacement reaction
Balanced one
Na_3PO_4+3HCl—»H_3PO_4+3NaCl#2
Decomposition reaction
Balanced one
2KClO_3—»2KCl+3O_2The SI unit for pressure is pascal (Pa). One hectopascal would equal how many pascals? 0. 1 Pa 10 Pa 100 Pa 1000 Pa.
Answer:
100 Pa
Explanation:
"Hecto" prefix is given when a physical quantity generally 100 times the amount of the unit.
1 Pa x 100100 PaA wave is sent down a tunnel where it travels and bounces of the far wall, returning to the sender. The wave travels at 4m/s and it takes 120 seconds to travel there and back. How deep is the cave?
Answer:
100ft
Explanation:
On the Earth, these convection cells form because of the __________ heating of the Earth and changes in pressure.
Group of answer choices:
even
equal
unequal
consistent
On the Earth, these convection cells form because of the unequal heating of the Earth and changes in pressure. Option C is correct.
What is a convection cell?A convection cell is a phenomenon that happens when there are density changes inside a liquid or gaseous medium.
The essential characteristics of a convection cell are rising and/or falling currents, which are caused by density variations.
These convection cells arise on Earth as a result of the Earth's uneven heating and pressure variations.
On the Earth, these convection cells form because of the unequal heating of the Earth and changes in pressure.
Hence,option C is correct.
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Which of the following summarizes cellular respiration?
Oxygen reacts with glucose to produce carbon dioxide and water, and release energy.
Light energy is changed into chemical energy.
Light energy is used to join water and carbon dioxide to make oxygen and glucose.
Chemical energy is changed into light energy.
The statement which summarizes cellular respiration is Oxygen reacts with glucose to produce carbon dioxide and water, and release energy.
What is cellular respiration?Cellular respiration is the process by which food, in the form of glucose is transformed into energy within cells.
The food is prepared by the plants by the process of photosynthesis in presence of sunlight. This food is in the form of glucose.
The respiration of plants is done by breaking of glucose by absorbing oxygen. This produces carbon- di- oxide and water along with the release of energy.
Thus, the cellular respiration is oxygen reacts with glucose to produce carbon dioxide and water, and release energy.
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A weight lifter does 586 J of work on a weight that he lifts in 3.5 seconds. What is the power with which he lifts the weight?
need help fast please
Answer:
Explanation:
The quantity of energy transferred by a force when it is applied to a body and causes that body to move in the direction of the force work.
Two electrons (-1.6 x 10-19 C) are separated by an insulator at a distance of 0.10 mm. Which of the following is the electrostatic force between these electrons?
The electrostatic force between these electrons will be 2.3×10⁻²⁰ N.
What is Columb's law?The force of attraction between two charges, according to Coulomb's law, is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
Charges that are similar repel each other, whereas charges that are diametrically opposed attract each other.
They will repel, moving in opposite directions at the same speed. Because the magnitude and nature of the charge are same.
The electrostatic force between these electrons is;
[tex]\rm F= \frac{Kq_1q_2}{r^2} \\\\ F=\frac{9 \times 10^9 \times -1.6 \times 10^{-19} \times- 1.6 \times 10^{-19} }{(0.10 \times 10^-3)^2} \\\\F= 2.3 \times 10^{-20} \ N[/tex]
Hence, the electrostatic force between these electrons will be. 2.3×10⁻²⁰ N.
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