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I have 3 study sheets.

for # 1 i got 34km/h

no, you have to multiply by 3.6

why?

|dw:1383926098747:dw|

4.9 m change it to km it is 0.0049km/s * 60 *60 = 33.8

look at my draw

-> 0.0049km/s * 60 *60 = 33.8
it is 17.64 and not 33.8

0.0049 * 60 * 60 = 17.64

maybe you did mistake when you enter the numbers into the calculator

the options are 94,000 km/h
34 km/h
2.6 km/h
34,000,000 km/h

0.0049 * 60 * 60 = 17.64
do it in the calculator and see

m is for meters right ? :O

yes. Idk maybe the options are wrong. i keep getting 17.64 too.

i guess they are wrong

well in x=1/2at^2 there is no mass

would X=Ft work?

you have options ?

yes
X=Ft
X=at
X=vt
and X=1/2at^2

yes Ft is the one

for 3 I want to say B?

no

(just to make sure that you understand
Ft units are [kg m / s] so it has mass distance and time)

now for 3. think what happens to y when x is small
and when x is big..

im confused

yes so thus my answer is A? AS X gets larger Y gets smaller.

yes ! A

1,000 cm3?

i think it iscorrect

Which equation represents inverse proportionality?
y=mx?

y=mx is linear proportionality direct ..

y=mx
y=mx^2 +b for nonzero b
y=m/x
y=mx^2

so how would that be represented by an equation?

y=m/x
as i said we had something like this before
when we chose graph A

oh. okay so its like the graph.

A bicycle and rider travel along a road. Which of the following statements is true?

The bicycle wheels rotate and translate the entire bike and the rider.

please write the other options as well

so your answer is correct

so if you were not moving
the relative speed was 0.5m/s
correct?

correct

now i guess the 0.8m/s walking backwards is relative to the belt!
so we have:
0.5 - 0.8

do you understand why ?

because he is walking backwards at 0.8

okay

correct

(650/430 = 1.5116...)

On the position-time graph, what is the average velocity between 5 s and 10 s?

not sure about this one.

average velocity = (y2-y1) / (t2 -t1)

between two points : (t1,y1) and (t2,y2)

4m/s?

you take the value of g as 9.8 ?

so yes correct..

v=gt
so
t=v/g
now plug it into
h = 0.5gt^2 = 0.5v^2/g = 18.4

A ship travels south at 15 km/h for 4 h. What is the ship's displacement in km? 60km South?

correct
15*4 = 60

What additional force must be applied so that the block does not accelerate?
10N West?

however the options are
- 3.33 N
- 1.50 N
- 1.00 N
- 4.00 N

so it is right.

yes

3.7*11

The 48 kg student on skates pushes the 40 kg student on skates. The 40 kg student accelerates at 3.0 m/s2. What is the acceleration of the 48 kg student?

im not sure about this one

newton's third law..

another hint ?

F=ma?

i feel stupid. sorry. ive been up all night

what is the force that acts on the 40kg student ?

dont feel stupid your answers are good

3m/s?

2.5 m/s

yes (well they might have there -2.5 since it is in the other direction)

so the situation is that they are moving toward each other ? and then elastic collision ?

i asume

correct then

so what do you think ?

A?

yes

newton's third law always involved two bodies

about 90N?

|dw:1383940674800:dw|
yes the accurate answer is 86.5 newton

Which of these is true about an object thrown straight up in the absence of air resistance?

so what do you think ?

C?

well no does g change during the motion ?

i want to say no

because the acceleration does not change

so it would be A?

yes

5m/sn2

ok

i'm on it
average velocity is change in velocity in unit time
so here it is 15-5/2 =5m/s^2

is it + or -?

and if vel is increasing, then acceleration is +ve

What shape does a position vs. time graph have for an object in uniform acceleration?

cubic
inverse
quadratic
linear

hi again

okay and hi

are your questions finished

ok.bye

please inform me when your questions are finished

no, my mom needed help with something.

1.5N

correct