You want to design a magnetic device to keep cupboard doors closed. What are the design consideration? Suggest suitable materials that may be used.

***THis question relates to water resources engineering***

What are some importances of closed loops in water distributions systems for purposes of maintaining system pressures?

Closure under Context-Free Languages

Show that the following operations are closed under context-free languages:

• union

• concatentation

• Kleene star

Hello, i Have an OPAMP of 66dB ,how using negative feedback we can reduce the closed loop gain to 16dB

Thanks

Chapter 7 Accounting for Bad Debts

Problem 7-1 - Accounting for Bad Debts

The Solo Company was started on January 1, 2010. The following events occurred
during 2010 and 2011.

2010

1.   Provided $4,000 of services on account.

2.   Collected $3,000 cash from accounts receivable.

3.   Estimated uncollectible accounts expense to be 1.5% of 2010 credit sales.

2011

1.   Wrote off $40 of accounts receivable that were deemed uncollectible.

2.   Provided $6,500 of services on account.

3.   Collected $5,400 cash from accounts receivable.

4. Received $5 from a bad debt that had been previously written off. Reinstated the account.

5.   Recorded the $5 cash received from the receivable reinstated in Event No. 4.

6.   Estimated uncollectible accounts expense to be 1% of 2011 credit sales.

Required

a.   Record the events in T-accounts, including closing the revenue and expense accounts to retained earnings.

b.   Record the events using the horizontal financial statements model under the titles of the affected accounts. Record a zero under each heading not affected by a given event. Compare the final balances in the T-accounts from Part a with the ending balances in the horizontal financial statements model.

Problem 7-1 Workpaper, part a. T-accounts, 2010

Problem 7-1 Workpaper, part b. Horizontal Financial Statements Model, 2010

Problem 7-1 Workpaper, part a. T-accounts, 2011

Problem 7-1 Workpaper, part b. Statements Model, 2011

A capacitor made of conductive plates (made of metal) is aligned as shown. The plates have a surface area of 2 x 10^-1 m² and are 0.01 m apart from each other. The capacitor is first connected to the voltage source until it is fully charged and produces a potential difference of V0 = 3 kV and then released from the voltage source earlier. If between the two capacitor plates the plastic dielectric material is inserted and fully filling the space between the two plates, the potential difference drops to 1 kV, while the charge on each plate remains. Then specify:

a) Capacitance at initial conditions C0
b) Large Q charge on each plate
c) Capacitance C after the dielectric material is inserted into the capacitor
d) Dielectric constant K on dielectric material
e) Permitivity ɛ of the dielectric material
f) Initial electric field E0
g) Electric field E after the dielectric material is inserted
h) Energy stored in the capacitors before and after the dielectric material is inserted
e) The density of energy stored in the capacitor before and after the dielectric material is inserted

Task 3

     Write a program that pushes the first 10 natural numbers to the stack, then pops those numbers. Use the debugger to view how the stack changes after each instruction. Once all the data has been pushed to the stack, take a screenshot of the stack in memory.

Task 4

    Write a subroutine called “Area” that calculates the area of a rectangle. Use accumulator A and B to pass the length and the width to the function. Use accumulator D to return the result.

HINT:

• load the width and height into accumulators A and B.
• Call the subroutine.
• Provide a flowchart, a snapshot of CPU registers before and after executing the subroutine.

    Now re-write the program from Task 3, but this time use the stack to pass the function arguments and the return value.

HINT:

• load the width into accumulator A, then push A to the stack
• load the height into accumulator B, then push B to the stack
• Allocate one word on the stack for the return value.
• Call the subroutine.
• After you return from the function, deallocate all variables from the stack.
• Provide a drawing of the stack frame and a snapshot of of the stack before, during and after executing the subroutine.

Write in Assembly for HCS12