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Ahat [919]
1 year ago
13

How many free passes do you get for skipping videos and getting answers

Computers and Technology
1 answer:
blondinia [14]1 year ago
3 0

Answer:

I think it is 1 because that is all that works for me

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3.A ball is thrown into the air with an initial velocity of 15 m/s. a.How long does it take the ball to reach maximum height?b.W
ehidna [41]

Answer:  a) = 1.5 sec.  b= 11.5 m. c=0  d= 1.5 sec.

Explanation:

a) Once thrown into the air , the only influence on the ball is gravity, so, we can conclude that the acceleration acting on the ball is the one due to gravity, i.e., g= 9.8 m/sec².

Applying the definition of acceleration, we can write the following equation:

a= (vf-vo) / t   ⇒ g = vf-vo / t. (1)

Now, when the ball reaches to his maximum height, it stops momentarily, and then starts to fall, so for this height, we can write vf=0.

Replacing  in (1), and solving for t, we get:

t = (0 -vo) / g = -15 m/s/ - 9.8 m/sec² (Taking upward as positive  direction)

a) t= 1.5 sec.

Replacing this value in the kinematic equation for displacement, when vo=15 m/s, we get:

hmax: 15 m/sec . 1.5 sec -1/2. 9.8 m/sec². (1.5 sec) ² (2)

b) hmax= 11.5 m

c) vf= 0 (as explained above)

Finally, in order to know how long the ball takes to return to its initial height, we know that for the falling part of the trajectory, vo=0, so we can write the equation for displacement as follows:

h=-hmax (because it returns to the same starting point)= 1/2 gt²=-11.5 m

Solving for t, we get:

d) t=1.5 sec.

It can be seen that the time used in going up, it is the same for going down, to travel the same distance.

This result is completely general and applies to any free fall problem.

3 0
3 years ago
Show the ERD with relational notation with crowfoot. Drexel University Financial Office has made contracts with several local ba
andreyandreev [35.5K]

Answer:

Detailed ERD Diagram is given in the attachment

3 0
3 years ago
What aviation first is janice brown credited with
Alla [95]

Janice Brown is a former teacher who flew the first long-distance solar-powered flight. She flew a small experimental solar-powered aircraft six miles.

Let me know if you have any questions.

7 0
3 years ago
How do you create a table in an existing database on Microsoft Access?
earnstyle [38]
Hello! In order to make a table in an existing database, first, you need to open the database you want to open, and then on the create tab, go on the tables group and click table. A table will be inserted into the database and you will be able to see it in datasheet view. That will help you make the table and be able to edit as needed.

8 0
3 years ago
Read 2 more answers
Assume the following variables are defined: int age; double pay; char section; write a single c instatement that will read input
JulsSmile [24]

Answer:

scanf("%d %lf %c", &age, &pay, &section);

Explanation:

To read the value in c program, the instruction scanf is used.

To read the integer value, use the %d format specifier in the scanf and corresponding variable name age with ampersand operator.

To read the double value, use the %lf format specifier in the scanf and corresponding variable name pay with ampersand operator.

To read the character value, use the %c format specifier in the scanf and corresponding variable name section with ampersand operator.

5 0
3 years ago
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