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Physics 7 Online
zarkam21:

Help

zarkam21:

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zarkam21:

@Vocaloid

Vocaloid:

|dw:1517371381553:dw|

Vocaloid:

just have to go through all 4 numbers and see which one gives you the highest result keep in mind you must take the absolute value

zarkam21:

D

Vocaloid:

I got one that's a little further off as a hint which answer choice is the farthest away from 9.78?

zarkam21:

oh c

Vocaloid:

awesome

zarkam21:

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zarkam21:

D

Vocaloid:

this question is kind of evil on the eyesight but|dw:1517371578645:dw|

Vocaloid:

|dw:1517371585199:dw| the center of the outlier looks like it's on the left side of 60 so 59

zarkam21:

so A

Vocaloid:

yeah (this q isn't drawn well)

zarkam21:

D?

zarkam21:

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Vocaloid:

good

zarkam21:

D

zarkam21:

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Vocaloid:

good

zarkam21:

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Vocaloid:

same formula as the one I posted at the beginning of this page

zarkam21:

D

Vocaloid:

100*|(19.1-19.3)/19.3| = ?

zarkam21:

A

Vocaloid:

check your calculations again (19.1-19.3) divide that by 19.3 take the absolute value multiply by 100

zarkam21:

B

Vocaloid:

well done

zarkam21:

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zarkam21:

A

Vocaloid:

good

zarkam21:

D

zarkam21:

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Vocaloid:

iirc for increments you can measure +1 significant digit than the one given so for 0.1 ml increments you can measure differences of 0.01 mL which implies A (1.33) is the highest precision available

Vocaloid:

so A

zarkam21:

B

zarkam21:

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Vocaloid:

significant digits are all about precision (A)

zarkam21:

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zarkam21:

would it be 59sin(23)

Vocaloid:

|dw:1517373690957:dw|

Vocaloid:

|dw:1517373696695:dw|

zarkam21:

D

Vocaloid:

good

zarkam21:

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Vocaloid:

no angle is given, will assume that the system is completely vertical net force = tension - weight

zarkam21:

1300-68=1232

Vocaloid:

68kg is mass not weight

zarkam21:

how do i calculate the weight

Vocaloid:

Fg = mg (be sure to write this down b/c you use this a lot in physics)

zarkam21:

666.4

Vocaloid:

good, so tension - weight = ?

zarkam21:

A

Vocaloid:

good

zarkam21:

D

zarkam21:

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Vocaloid:

gud

zarkam21:

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zarkam21:

B

Vocaloid:

good

zarkam21:

A

zarkam21:

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Vocaloid:

I think that's right (none of the other ones make sense in this context)

zarkam21:

C

zarkam21:

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Vocaloid:

gud

zarkam21:

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Vocaloid:

F = ma

zarkam21:

A

Vocaloid:

good

zarkam21:

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zarkam21:

B

Vocaloid:

good

zarkam21:

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zarkam21:

c

Vocaloid:

good

zarkam21:

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Vocaloid:

friction force = μ * N solve for μ

zarkam21:

B

zarkam21:

u=force/n

Vocaloid:

keep in mind friction force = Ff and normal force = Fn

Vocaloid:

Fk sorry not Ff

zarkam21:

so either c or d

Vocaloid:

v is not part of the formula so it cannot be D

zarkam21:

so c

Vocaloid:

yes

zarkam21:

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zarkam21:

A

Vocaloid:

good

zarkam21:

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zarkam21:

B

Vocaloid:

good

zarkam21:

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zarkam21:

A

Vocaloid:

|dw:1517375964628:dw|

zarkam21:

D

Vocaloid:

good

zarkam21:

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zarkam21:

B

Vocaloid:

good

zarkam21:

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zarkam21:

A

Vocaloid:

friction force = μN

zarkam21:

D

Vocaloid:

good

zarkam21:

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zarkam21:

A

Vocaloid:

good

zarkam21:

D

zarkam21:

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Vocaloid:

good

zarkam21:

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zarkam21:

C

Vocaloid:

\(\color{#0cbb34}{\text{Originally Posted by}}\) @Vocaloid friction force = μN \(\color{#0cbb34}{\text{End of Quote}}\) check your calculations again

zarkam21:

B

Vocaloid:

normal force is equal to weight in this scenario

zarkam21:

225.

zarkam21:

which would be 225.4

zarkam21:

because mass*9.8

Vocaloid:

good so friction = ?

zarkam21:

0.8

Vocaloid:

friction force = μN

zarkam21:

A ugh

Vocaloid:

gud

zarkam21:

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zarkam21:

400

Vocaloid:

good

zarkam21:

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Vocaloid:

f = ma

zarkam21:

B

zarkam21:

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Vocaloid:

Fc = mv^2/r ---> would recommend writing this down

zarkam21:

85v^2/r

Vocaloid:

keep going

zarkam21:

85v^2/8=

Vocaloid:

keep going

zarkam21:

85(4.5)^2/r

zarkam21:

85(4.5)^2/8=

Vocaloid:

good, keep going

zarkam21:

C

Vocaloid:

good

zarkam21:

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zarkam21:

C

Vocaloid:

good

zarkam21:

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zarkam21:

B

Vocaloid:

yup

zarkam21:

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zarkam21:

C

Vocaloid:

yup

zarkam21:

A

zarkam21:

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Vocaloid:

good

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