Sunday

April 20, 2014

April 20, 2014

Posted by **Physics** on Saturday, July 11, 2009 at 7:39pm.

How far up the plane will it go

ok I got this to be something like 2.2 about i understand this

i need help on this

how much time elapses before it returns to tis starting point? Ignore friction.

ok I need to know what formula to use to rearange for time

i thought it was this

x = 2^-1 a t^2 + Vo t + Xo

if i'm right then i guess I do not know how to rearange this for time because ther's a t^2 and t so could show me how to rearange this for time

thanks

- Phyiscs -
**bobpursley**, Saturday, July 11, 2009 at 8:00pmVo is zero, starting at the top.

T= sqrt(2x/g) where g is the component of gravity down the plane 9.8sin22

- Phyiscs -
**drwls**, Saturday, July 11, 2009 at 8:12pmIf the plane is frictionless, the block will rise a vertical height h so thet mgh equals the initial kinetic energy (1/2) mV^2. Thus h = V^2/(2g) = 0.81 m. The distance x that the block mov es up the track is h/sin22 = 2.2 m

So your answer is correct.

The block decelerates at a rate

a = g sin 22 = 3.67 m/s^2.

The block reaches maximum height when

t = V/a = 4/3.67 = 1.1 s

It takes the same length of time to come back down. The total e;apsed ti9me to return is thus 2.2 s

You could also solve

y = V t - (a/2) t^2 = 0

to get the answer. Ignore the t=0 solution.

t = 8/a = 2.2

**Related Questions**

Physics - My question is A block is given an intial speed of 4.0 s^-1 m up the ...

Physics - for some reason I keep on getting 1.2 seconds for (b) and .86 m for (a...

physics B - A block is given n intial speed of 3.0 s^-1 m up the 22.0 degree ...

Physics - Ok I asked this question before A lbock is given an intial speed of 4....

Physics - A crate is given an initial speed of 3.1 m/s up the 29 degree plane ...

Science - A coffin is given an initial speed of 4.4 m/s up the 17.8º inclined ...

physics - A crate is given an initial speed of 2.9 up the 29 plane shown in the ...

Physics PLEASE HELP - A coffin is given an initial speed of 4.4 m/s up the 17.8...

physics - A block is projected up a frictionless inclined plane with initial ...

physics - A block is projected up a frictionless inclined plane with initial ...