Your boss tells you that she needs a decision by the end of the day about the machine you want to purchase for your new operation. you have four options, and your boss reminds you to be as cost-efficient as possible but that she also wants the best efficiency. which is your best option? option 1: this $5,000 machine is supplied energy at a rate of 1,900 w and does useful work at a rate of 1,786 w. option 2: this $4,500 machine is supplied energy at a rate of 1,450 w and does useful work at a rate of 1,300 w. option 3: this $4,750 machine is supplied energy at a rate of 1950 w and does useful work at a rate of 1833 w. option 4: this $4,750 machine is supplied energy at a rate of 2,000 w and does useful work at a rate of 1,822 w. a. option 1 b. option 2 c. option 3 d. option 4

C.option 3

Explanation:

We are given that Your boss tell you that she needs a decision by the end of the day about the machine you want to purchase for your new operation .

You have four choices , and your boss reminds you to be cost-efficient as possible but she wants the best  efficiency .

Efficiency of machine  : It tell us how much input energy converted into useful work.

Efficiency of machine= Output energyinput energy

In option 1  machine cost = $5000

The rate of  supplied energy of machine =1900 W

The rate of useful work= 1786 W

Efficiency=

In option 2

Machine cost =$45,00

The rate of  supplied energy of machine= 1450 W

The rate of useful work=1300 W

Efficiency=

In option 3

Machine cost=$14750

The rate of  supplied energy of machine=1950 W

The rate of useful work=1833 W

Efficiency=

In option 4

Machine cost=$4750

The rate of  supplied energy of machine=2000 W

The rate of useful work= 1822 W

Efficiency=

In option 1 and 3 cost are different but the efficiency of machine in option 3  and option  1 is same. But the cost of option 3 is smaller than the cost of machine in option 1. Hence, option 3 is best .

C.option 3

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.