The Official Homework Help Thread!

[Mango]

haha no problem~

what do you have as the answer btw?

Boo

[KimHeeSung]

haha no problem~

what do you have as the answer btw?

1968.34264?

[pimo]

1968.34264?

It should be somewhere around -1.8

-302 /(5.37 x 35)

multiply the 5.37 by the 35 should give you around 175

then do -302/ 175 

it should equal something around -1.8

 

sorry for the late reply lol

Boo

omg youre a very scary fruit

[Mango]

help

[Athena]

help

Average Velocity = Displacement / Time
Displacement = V x T

*Change 34 minutes into seconds

Diplacement = 0.98m/s x 34(60)
Displacement = 1999.2m


Should be this. Edited August 31, 2015 by Athena

[Mango]

Average Velocity = Displacement / Time
Displacement = V x T

*Change 34 minutes into seconds

Diplacement = 0.98m/s x 34(60)
Displacement = 1999.2m


Should be this.

thanks that's how I worked it n got the answer but I second guessed myself n wanted to make sure

[Mango]

idgi

[Athena]

idgi

If it's moving at a constant velocity that means that it's not accelerating.

So it's 0 m/s^2 to the right.

[pimo]

idgi

if the velocity is constant, then theres no acceleration right?

[Mango]

If it's moving at a constant velocity that means that it's not accelerating.
So it's 0 m/s^2 to the right.

thanks!
What kind of mean girls answer though...

[VANTE]

thanks!
What kind of mean girls answer though...

lmaooooooo

[Athena]

thanks!
What kind of mean girls answer though...

i don't get it :._.:

[Mango]

part b?

[lloris]

 

part b?

I think you have to calculate both up and down moves to get the complete trajectory and sum the times. 

 

Up move: 

v = v0 - gt

Considering g = 10 m/s^2 but you can also consider 9,8 or other gravity acceleration approximated values.

0 = 8 - 10t

t= 0,8 s

 

Down move:

(in the down move the velocity which the ball was thrown (initial) ideally is the final)

v = v0 + at

8 = 0 + 10t

t = 0,8 s

 

t = 0,8 + 0,8 = 1,6 s

[Mango]

 

 

I think you have to calculate both up and down moves to get the complete trajectory and sum the times. 

 

Up move: 

v = v0 - gt

Considering g = 10 m/s^2 but you can also consider 9,8 or other gravity acceleration approximated values.

0 = 8 - 10t

t= 0,8 s

 

Down move:

(in the down move the velocity which the ball was thrown (initial) ideally is the final)

v = v0 + at

8 = 0 + 10t

t = 0,8 s

 

t = 0,8 + 0,8 = 1,6 s

 

great explanation! thank you :)

[pimo]

Hey everyone! I just started school lol and I'm rusty, can anyone tell me what significant digits are? And when solving a question how do I round the answer?
Also were going to have a debate soon, if anyone has any opinions on either sides of the death penalty argument please share,
Thanks in advance^^

[Athena]

Hey everyone! I just started school lol and I'm rusty, can anyone tell me what significant digits are? And when solving a question how do I round the answer?
Also were going to have a debate soon, if anyone has any opinions on either sides of the death penalty argument please share,
Thanks in advance^^

Significant digits are significant figures right? (sig fig for short)

 

If so, it's digits that are used to make measurements look more precise?

 

From what I remember here are the rules:

1. All non-zero numbers are significant. (i.e. 1,2,3,4,5,6)

2. Zeros are only significant when they are either:

a. in between non-zero numbers (i.e in the number 4005687 the zeros are significant)

b. when a decimal point is put after the final zero (i.e. 3240.)

c. when there are zeros after a decimal point (i.e. 19.001)

 

3. If a zero is in a number without following any of the above rules it is insignificant (i.e in the number 4600 the 2 zeros are insignificant)

4. if the number if there a zeroes before a decimal point (without any other non-zero numbers before it) like this (0.00000001) those zeros are also insignificant.

 

Using these rules you know how many sig figs are in a number...examples:

 

a) 2400 has 2 sig figs (Rule #3)

b) 2003 has 4 sig figs (Rule #2a)

c) 6. has 1 sig fig (Rule #1)

d) 6.00000000012 has 12 sig figs (Rule #2c)

e) 0.003 has 1 sig fig (Rule #4)

 

is this what you wanted explained?

Edited September 9, 2015 by Athena

[KimHeeSung]

Can you help me with these..

 

-29.5 = 9 + 4.5(d-8)

 

and

 

5 - 2.5(1.9.5x) = 18.5

[pimo]

Significant digits are significant figures right? (sig fig for short)
 
If so, it's digits that are used to make measurements look more precise?
 
From what I remember here are the rules:
1. All non-zero numbers are significant. (i.e. 1,2,3,4,5,6)
2. Zeros are only significant when they are either:
a. in between non-zero numbers (i.e in the number 4005687 the zeros are significant)
b. when a decimal point is put after the final zero (i.e. 3240.)
c. when there are zeros after a decimal point (i.e. 19.001)
 
3. If a zero is in a number without following any of the above rules it is insignificant (i.e in the number 4600 the 2 zeros are insignificant)
4. if the number if there a zeroes before a decimal point (without any other non-zero numbers before it) like this (0.00000001) those zeros are also insignificant.
 
Using these rules you know how many sig figs are in a number...examples:
 
a) 2400 has 2 sig figs (Rule #3)
b) 2003 has 4 sig figs (Rule #2a)
c) 6. has 1 sig fig (Rule #1)
d) 6.00000000012 has 12 sig figs (Rule #2c)
e) 0.003 has 1 sig fig (Rule #4)
 
is this what you wanted explained?

YES THANK YOU SO MUCH :D

[pimo]

Can you help me with these..

-29.5 = 9 + 4.5(d-8)

and

5 - 2.5(1.9.5x) = 18.5

First lets get the brackets by itself by subtracting nine from both sides
-29.5 - 9= 4.5(d-8)
-38.5=4.5(d-8)
Divide both sides by 4.5

-38.5/4.5 = d-8
-8.333 = d-8
Then add 8 to both sides
-0.333 = dd

I don't get the second question, there are three decimal points lol Edited September 9, 2015 by pimo

[Carrot1202]

For my English class I have to write an informational essay, and the topic is "How are Americans more privileged or not as privileged as citizens of other countries?" So if any of you guys has articles or websites about the topic, please give me the links. 

Edited September 10, 2015 by Carrot1202

[pimo]

For my English class I have to write an informational essay, and the topic is "How are Americans more privileged or not as privileged as citizens of other countries?" So if any of you guys has articles or websites about the topic, please give me the links.

Try checking out the water system in the US compared to in developing nations, or water consumption rates
Lol I can't research right now but some ideas u can search for are equality (gays, genders, even race),education and maybe things your government provides for you that isn't available in other places

[lloris]

great explanation! thank you :)

You're welcome :)

[Guest]

Significant digits are significant figures right? (sig fig for short)

 

If so, it's digits that are used to make measurements look more precise?

 

From what I remember here are the rules:

1. All non-zero numbers are significant. (i.e. 1,2,3,4,5,6)

2. Zeros are only significant when they are either:

a. in between non-zero numbers (i.e in the number 4005687 the zeros are significant)

b. when a decimal point is put after the final zero (i.e. 3240.)

c. when there are zeros after a decimal point (i.e. 19.001)

 

3. If a zero is in a number without following any of the above rules it is insignificant (i.e in the number 4600 the 2 zeros are insignificant)

4. if the number if there a zeroes before a decimal point (without any other non-zero numbers before it) like this (0.00000001) those zeros are also insignificant.

 

Using these rules you know how many sig figs are in a number...examples:

 

a) 2400 has 2 sig figs (Rule #3)

b) 2003 has 4 sig figs (Rule #2a)

c) 6. has 1 sig fig (Rule #1)

d) 6.00000000012 has 12 sig figs (Rule #2c)

e) 0.003 has 1 sig fig (Rule #4)

 

is this what you wanted explained?

i would've said that 2400 has 4 significative figures but then where i live we'd never write "6." (we don't even use decimal points we use commas)
because if you measure or calculate something and say that the result is 2400 then it means that you're sure that there are two zeros after your 24, or at least that's what i've always learned
a rigorous way of writing it with 2 significant figures would be "2.4*10^3" i think?? i'm gonna need someone to correct me if i'm wrong

i'm curious now, where are you from?? because maybe the difference comes from country conventions

Edited September 12, 2015 by almasy

[pimo]

i would've said that 2400 has 4 significative figures but then where i live we'd never write "6." (we don't even use decimal points we use commas)
because if you measure or calculate something and say that the result is 2400 then it means that you're sure that there are two zeros after your 24, or at least that's what i've always learned
a rigorous way of writing it with 2 significant figures would be "2.4*10^3" i think?? i'm gonna need someone to correct me if i'm wrong
i'm curious now, where are you from?? because maybe the difference comes from country conventions

I'm from Canada, my physics teacher is the same way