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3 years ago

Describe how electrons move between atoms to create electricity.

2 answers:

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Applying potential difference to a conductor, by potential force, free electrons gain energy and move from low to high potential. Thus, electrons move from one atom to another.

Dovator [93]3 years ago

3 0

It has positive and negative charges, which is expressed in coulomb. An electrical phenomenon is caused by flow of free electrons from one atom to another.

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If you are parked on an incline with a manual transmission vehicle and your vehicle is facing downhill, you should put your vehi

emmainna [20.7K]

If you're parked between cars, it's preferable to just leave it in neutral: this way, if somebody bumps you, it doesn't harm the transmission. Just make sure you've got the handbrake firmly set.

<span>If on a hill, 1st gear if facing uphill; reverse if facing downhill. Just make sure to set the parking brake </span>before<span> releasing the clutch, so that the weight of the car is on the brake first; the gear is there only as a backup should the brake fail.</span>

4 0

3 years ago

Write a program to help a local restaurant automate its breakfast billing system. The program should do the following:

Maurinko [17]

Answer:

Please find the code and its output in the attached file:

Explanation:

In this code a structure "menuItemType" is defined that declared float and integer variable and outside the structure its list type variable "menuList" is defined that holds and calculates its value.

In the next step, a class "Rest" is defined, and inside the class a method "getData", "showMenu", and "printCheck" is defined, in which the above methods uses the switch for input and calculate the value and the last "printCheck" calculates the Tax and Amount Due value.

In the main method, a class object is created that prints message and call the above method.

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3 years ago

A) How could you modify Shelve with a technique discussed in class so that you can create Shelve instances that contain // Tools

Kay [80]

Answer:

See explanation

Explanation:

A “shelf” is a dictionary-like object. A shelf is an arbitrary Python objects, that is; anything that the pickle module can handle. This includes recursive data types and objects containing lots of shared sub-objects. It must be noted that the keys are ordinary strings.

(A). modification to Shelve can be done by following this instructions;

(1). Do not redefine built-in functions,(2). grab shelved item, mutate item, write mutated item back to shelf.

The number (2) instructions is during iteration over shelved items.

(B). CREATING FUNCTIONS THAT TAKES IN TWO SHELVES;

import shelve

d = shelve.open(filename) # open -- file may get suffix added by low-level

# library

d[key] = data # store data at key (overwrites old data if

# using an existing key)

data = d[key] # retrieve a COPY of data at key (raise KeyError if no

# such key)

del d[key] # delete data stored at key (raises KeyError

# if no such key)

flag = key in d # true if the key exists

klist = list(d.keys()) # a list of all existing keys (slow!)

# or, d=shelve.open(filename,writeback=True) would let you just code

# d['xx'].append(5) and have it work as expected, BUT it would also

# consume more memory and make the d.close() operation slower.

d.close() # close it

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4 years ago

A user states that when they power on their computer, they receive a "Non-bootable drive" error. The user works with external st

laila [671]

Answer:

B. Device boot order

Explanation:

The Device boot order makes a list of all the possible devices a system should check to in the operating system's boot files, as well as the proper sequence they should be in. Removable devices, hard drives, and flash drives are some devices that can be listed in the device boot order.

For the user whose computer displays a 'non-bootable drive' error, the device boot order would check all the devices listed to attempt booting from any of them. These devices might be in the order of removable discs, CD-ROM, hard drive. If all the options do not work, the computer would then do a Network boot. The order in which the devices are listed can be altered by the user.

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4 years ago

What is decorator and how to use it wit Python programming language?

SCORPION-xisa [38]

Answer:

Decorators are very powerful and useful tool in Python since it allows programmers to modify the behavior of function or class. Decorators allow us to wrap another function in order to extend the behavior of wrapped function, without permanently modifying it.

Explanation:

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3 years ago