The interaction between two like-charged objects is repulsive. ... Positively charged objects and neutral objects attract each other; and negatively charged objects and neutral objects attract each other.
Answer:
$893
Explanation: the complete question should be
The clothes washer in your house consumes 470 kWh of energy per year. Price of the washer is $360 and the lifetime of the washer is 10 yrs. Energy price in your city is 9 cents per kWh. What is the lifecycle cost of the clothes washer? (assume a maintenance cost of $11 per year)
SOLUTION
Given:
The clothes washe power consumption (PC) is 470 kWh
Price of the washer (P) is $360
lifetime of the washer (L) is 10 yrs
Energy price in the city (E) is 9 cents per kWh (Covert to $ by dividing 100)
maintenance cost (M) is $11 per year
Lifecycle cost = P + (PC × L × E) +M + L
Lifecycle cost = $360 + (470kWh × 10years × 9cents/100) + ($11 × 10years)
=$893
Answer:
Yes, it is reasonable to neglect it.
Explanation:
Hello,
In this case, a single molecule of oxygen weights 32 g (diatomic oxygen) thus, the mass of kilograms is (consider Avogadro's number):
![m=1molec*\frac{1mol}{6.022x10^{23}molec} *\frac{32g}{1mol}*\frac{1kg}{1000g}=5.31x10^{-26}kg](https://tex.z-dn.net/?f=m%3D1molec%2A%5Cfrac%7B1mol%7D%7B6.022x10%5E%7B23%7Dmolec%7D%20%2A%5Cfrac%7B32g%7D%7B1mol%7D%2A%5Cfrac%7B1kg%7D%7B1000g%7D%3D5.31x10%5E%7B-26%7Dkg)
After that, we compute the potential energy 1.00 m above the reference point:
![U=mhg=5.31x10^{-26}kg*1.00m*9.8\frac{m}{s^2}=5.2x10^{-25}J](https://tex.z-dn.net/?f=U%3Dmhg%3D5.31x10%5E%7B-26%7Dkg%2A1.00m%2A9.8%5Cfrac%7Bm%7D%7Bs%5E2%7D%3D5.2x10%5E%7B-25%7DJ)
Then, we compute the average kinetic energy at the specified temperature:
![K=\frac{3}{2}\frac{R}{Na}T](https://tex.z-dn.net/?f=K%3D%5Cfrac%7B3%7D%7B2%7D%5Cfrac%7BR%7D%7BNa%7DT)
Whereas
stands for the Avogadro's number for which we have:
![K=\frac{3}{2} \frac{8.314\frac{J}{mol*K}}{6.022x10^{23}/mol}*(23+273)K\\ \\K=6.13x10^{-21}J](https://tex.z-dn.net/?f=K%3D%5Cfrac%7B3%7D%7B2%7D%20%5Cfrac%7B8.314%5Cfrac%7BJ%7D%7Bmol%2AK%7D%7D%7B6.022x10%5E%7B23%7D%2Fmol%7D%2A%2823%2B273%29K%5C%5C%20%5C%5CK%3D6.13x10%5E%7B-21%7DJ)
In such a way, since the average kinetic energy energy is about 12000 times higher than the potential energy, it turns out reasonable to neglect the potential energy.
Regards.
Answer:
C. She should get the Earth spinning on its axis again.
Explanation:
The Earth experiences day and night because of its spinning on its own axis.
If Kara's science-fiction story doesn't have the Earth spinning on its own axis, then the Earth will not experience day and night and hence Kara should incorporate this idea into his story.
Answer:
Newtons.
Explanation:
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
Where;
F represents force measured in Newton.
m represents the mass of an object measured in kilograms.
a represents acceleration measured in meter per seconds square.
Newtons is a measurement we use to determine the amount of force used to move an object by a simple machine. It is the International System of Units (SI) used to measure force and has a symbol of N.
Basically, it was named after Sir Isaac Newton based on his fundamental works in the field of mechanics (motions).