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3 years ago

Select the correct answer.

Engineering

1 answer:

neonofarm [45]3 years ago

5 0

Answer:A 1.

Explanation:

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SashulF [63]

To be honest i have no idea

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3 years ago

An electron is traveling with initial kinetic energy K in a uniform electric field. The electron comes to rest momentarily after

KIM [24]

Answer:

The answer is below

Explanation:

a) The work done is equal to the loss in kinetic energy (KE)

Change in kinetic energy (ΔKE) = Final kinetic energy - initial kinetic energy

Final KE = $\frac{1}{2}mv_f^2$

But the final velocity is 0 (at rest). Hence:

Final KE = $\frac{1}{2}mv_f^2=\frac{1}{2}m(0)^2=0$

ΔKE = 0 - K = -K

W = ΔKE = -K

Also, the work done (W) = charge (q) * distance (d) * electric field intensity (E)

W = qEd

but q = -e, hence:

W = -e * E * d

Using:

W = ΔKE

-e * E * d = -K

E= K / (e * d)

b) The electric field is in the direction of the electrons motion

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3 years ago

What are the causes and solutions of social problems ?what are the causes and solutions of social problems

aksik [14]

Answer:

causes: unemployment, poverty,Lack of education,urbanization e.t.c

solutions:making people educated, giving people jobs

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3 years ago

What is the thermal efficiency of a gas power cycle using thermal energy reservoirs at 627°C and 60°C? The thermal efficiency is

Vesna [10]

Answer

63 %

Explanation:

It is given that the reservoirs is at the temperature of 627°C and 27°C

So lower temperature that is $T_L$ = 60°C=273+60=333 K

And the higher temperature that is $T_H$ = 627°C =273+627=900 K

We know that the thermal efficiency of thermal reservoir = 1- $\frac{T_L}{T_H}$ = $1-\frac{333}{900}$ = 0.63 =63 %

So the efficiency of the reservoir is 63%

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3 years ago

Question 29: Returns a string based on input string The function below takes a single string parameter: input_string. If the inp

kirill [66]

Answer:

Two Python codes are explained for the problem. Modify as appropriate

Explanation:

def string_contains(input_string): # called function

if(input_string.__contains__('z')): # Check input_string contains 'z'

print('has the letter z.') # print input_string contains 'z'

else:

print('not worthwhile.') # print if input_string not contains 'z'

input_string = input('Please enter the string: ') # ACeept string from user

string_contains(input_string) # calling function where we pass input_string as actual parameter

def string_contains(input_string):

for x in input_string:

if x=='z':

return 'has the letter z'

return 'not worthwhile'

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3 years ago