physics (it's rather urgent help is appreciated
posted by anon .
We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure)
(a) At what horizontal distance from the house wall is the stone going to hit the roof  s in the figure? (in meters)
b) What time does it take the stone to reach the roof? (in seconds)

physics (it's rather urgent help is appreciated 
bobpursley
height of roof: 6+ slope*(distance15)
slope=sin30 notice distance is the horizontal distance from the wall. distance=vo*cos35*timeinair you know vo, given.
so using that height funcion,
hf=heightof roof=voSin35*time4.9t^2
or
[6+ sun30*(distance15)]*=
6+ sun30*(20*cos35*t 15)=20cos30*t4.9t^2
solve for time in air, t. That is when it hits the roof.
Now, putting that into the horizontal distance equation: 20*cos35*t
check my thinking. Have fun. 
physics 
anon
thank you so much, sorry for being rather spamy so to say

physics 
anon
i can't quite get the value of t

physics (it's rather urgent help is appreciated 
ss01
its wrong....

physics (it's rather urgent help is appreciated 
kyle
ss01 how do you solve this then

physics (it's rather urgent help is appreciated 
Phy
Even I wanted to know how to solve this problem.
Can any one tell me how to solve the first problem of the exam?
I got the answers of all problems except these 2. 
physics (it's rather urgent help is appreciated 
ss01
i got it wrong followed your ways

physics (it's rather urgent help is appreciated 
ss01
@phy what other questions did you got? i got 1st one

physics (it's rather urgent help is appreciated 
kyle
i got all except this one

physics (it's rather urgent help is appreciated 
Phy
kyle and ss01 can you please tell me how to solve the 1st problem?

physics (it's rather urgent help is appreciated 
kyle
which part?

physics (it's rather urgent help is appreciated 
ss01
keep on differentiating and put the time value u vl get it

physics (it's rather urgent help is appreciated 
ss01
@kyle could you plz tell me how to do 2 & 3

physics (it's rather urgent help is appreciated 
kyle
@ss01 if you check homework 2 the 2nd last question it shows you how to do question 2.
for quetion 3 Ac must be 10m/s
so you get 10=v^2/r and from there you can solve since i don't know what value of r you got 
physics (it's rather urgent help is appreciated 
ss01
@ kyle what is the option for 3 question
my radius is 7m and mass is 5kg 
physics (it's rather urgent help is appreciated 
Anonymous
plz tell me how to do 5 & 6

physics (it's rather urgent help is appreciated 
ss01
@kyle what is for south pole

physics (it's rather urgent help is appreciated 
Anonymous
qustion 3
v=8.366 
physics (it's rather urgent help is appreciated 
Anonymous
south pole is 0

physics (it's rather urgent help is appreciated 
Anonymous
ac=v^2/r

physics (it's rather urgent help is appreciated 
ss01
@anonymous plz specify

physics (it's rather urgent help is appreciated 
Anonymous
v=sqrt(r*g)

physics (it's rather urgent help is appreciated 
ss01
kyle ...got the 2

physics (it's rather urgent help is appreciated 
ss01
@anonymous what is the 3rd option for question 3

physics (it's rather urgent help is appreciated 
kyle
@Anonymous how do you solve for the 7th question

physics (it's rather urgent help is appreciated 
ss01
@kyle did you all the options for 6th one?
i got 1st 2 correct rest all wrong 
physics (it's rather urgent help is appreciated 
Phy
I didn't get you, can you explain it properly how to do the 1st problem

physics (it's rather urgent help is appreciated 
ss01
for acceleration double differentiate the equation. you get only x and y vector left with some constant but no z vector

physics (it's rather urgent help is appreciated 
ss01
i didn't got the speed

physics (it's rather urgent help is appreciated 
Phy
Well, I don't know how to differentiate, can you explain it to me.

physics (it's rather urgent help is appreciated 
ss01
you could search on youtube there are lot of good videos on it. there are various rules too be followed.

physics (it's rather urgent help is appreciated 
Phy
Can you tell me how to calculate distance of the particle to the origin at time, speed of the particle and the smaller angle? I got the acceleration. Thanks

physics (it's rather urgent help is appreciated 
kyle(PLS HELP )
distance is the magnitude of the position vectors
speed is the magnitude of the velocity vector and
for the angle its the z vector for velocity divided by the magnitude of the velocity 
physics (it's rather urgent help is appreciated 
Phy
Thanks. Did you get Stone On Roof Find Distance problem?

physics (it's rather urgent help is appreciated 
ss01
@kyle did you got angle 0?
337.64 for dis? 
physics (it's rather urgent help is appreciated 
kyle(PLS HELP )
no, i think bobpursely was wrong, trying to get a second opinion

physics (it's rather urgent help is appreciated 
ss01
@KYLE plz reply

physics (it's rather urgent help is appreciated 
ajay
anyone for stone off a cliff question help?

physics (it's rather urgent help is appreciated 
Anonymous
@ss01 for what question

physics (it's rather urgent help is appreciated 
ss01
i got all except for stone on roof, find distance

physics (it's rather urgent help is appreciated 
ss01
anyone any luck?

physics (it's rather urgent help is appreciated 
anon
@ss01 did you manage to find the time?

physics (it's rather urgent help is appreciated 
ss01
@anon for which question?

physics (it's rather urgent help is appreciated 
anon
@ss01 for the inclined wall stone throw

physics (it's rather urgent help is appreciated 
ss01
i didn' t got that, the 2nd last question right?

physics (it's rather urgent help is appreciated 
anon
yeah

physics (it's rather urgent help is appreciated 
ss01
did you got the hw3 question5 & 7

physics (it's rather urgent help is appreciated 
anon
no
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