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3 years ago

Is friction a contact force

Mathematics

1 answer:

harina [27]3 years ago

4 0

Yes ,it is a contact force .Example when a ball touches de floor friction makes it go slow and makes it go up

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Please answer soon I need this answer very quickly for math. Thank you!

Kazeer [188]

a. First five terms: 9,13,17,21,25

b. Sum of first 25 terms = 1425

c. The given sequence is an arithmetic sequence because the common difference between two consecutive terms is same.

Further explanation:

Given

Formula of sequence

$a_n=4n+5$

1. First 5 terms:

For first 5 terms, we have to put n=1,2,...5,

So,

$For\ n=1\\a_1=4(1)+5\\=4+5\\=9\\For\ n=2\\a_2=4(2)+5\\=8+5\\=13\\For n=3\\a_3=4(3)+5\\=12+5\\=17\\For\ n=4\\a_4= 4(4)+5\\=16+5\\=21\\For\ n=5\\a_5=4(5)+5\\=20+5\\=25\\First\ 5\ terms\ are: 9,13,17,21,25$

2. Sum of first 25 terms:

For that we have to find 25th term first

$a_{25} = 4(25)+5\\=100+5\\=105$

The formula for sum is:

$S_n=\frac{n}{2}(a_1+a_n)}\\Putting\ the\ values\\S_n=\frac{25}{2}(9+105)\\=12.5(114)\\=1425$

3. Type of sequence

The given sequence is an arithmetic sequence because the common difference between two consecutive terms is same.

i.e.

$d=4$

Keywords: Arithmetic sequence, Sum of arithmetic sequence

Learn more about arithmetic sequence at:

#LearnwithBrainly

4 0

4 years ago

(Will give BRAINLIST to best answer)

Veronika [31]

Answer:

Angle 2 = 120 degrees, Angle 1 = 60 degrees

Step-by-step explanation:

Since a straight angle is 180 degrees, you have to add up the 2 angles to 180.

x+x+60=180

2x+60=180

2x=120

x=60

Angle 1 = 60

Angle 2 = 60+60=120

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3 years ago

Two trains, Train A and Train B, weigh a total of 421 tons. Train A is heavier than Train B. The difference of their weights i

Assoli18 [71]

Answer:

train b is 108

train a is 313

Step-by-step explanation:

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3 years ago

The perimeter of a rectangle is 56 meters, and its length is 15 meters. Which equation can be used to find the width of the rect

omeli [17]

Answer:

Step-by-step explanation:

2(L+B)

Where L is the length and B is the breadth.

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3 years ago

The price of a dress is reduced by 50%. When the dress still does not sell, it is reduced by 50% of the reduced price. If the

Igoryamba

Answer:

the answer is 400$

Step-by-step explanation:

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