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Physics 70 Online
OpenStudy (anonymous):

A piece of chalk is tossed vertically upward by Prof. Schwarzenegger and hits the ceiling 98 feet above with a BANG. (Neglect the effects of air resistance. Round your answers to two decimal places.) (b) Assuming that Prof. Schwarzenegger in fact tossed the piece of chalk up at 98 ft/s, how fast was it moving when it struck the ceiling? ft/s (c) Assuming that Prof. Schwarzenegger tossed the chalk up at 98 ft/s, and that it recoils from the ceiling with the same speed it had at the instant it hit, how long will it take the chalk to make the return journey and hit the ground? @Mathem

OpenStudy (anonymous):

any clues? haha

OpenStudy (anonymous):

Vfinal^2 = Vinitial^2 + 2aX 1. sqrt((98^2) + 2(-9.81)98) 2. sqrt(-(98^2) + 2(-9.81)98)

OpenStudy (anonymous):

is that b or c?

OpenStudy (anonymous):

1 is b 2 is c

OpenStudy (anonymous):

that formula that i gave you, has your teacher taught you that?

OpenStudy (anonymous):

isnt the square root of 92 squared 98?

OpenStudy (anonymous):

not sure what you mean

OpenStudy (anonymous):

for the first part of #1 you gave me

OpenStudy (anonymous):

calculate everything before you take the square root

OpenStudy (anonymous):

ive set it equal to V final, so i took the square root to cancel the square

OpenStudy (anonymous):

i just noticed an error with #2

OpenStudy (anonymous):

iim not getting number 1 right i solved and got 87.6

OpenStudy (anonymous):

let me get a calc

OpenStudy (anonymous):

seems right to me

OpenStudy (anonymous):

geez i dont know what im doing wrong

OpenStudy (anonymous):

what did you get when you solved c?

OpenStudy (anonymous):

do you know how to do quadratic equations?

OpenStudy (anonymous):

yeah but i dont know how im getting c wrong

OpenStudy (anonymous):

can you tell me what you get

OpenStudy (anonymous):

i got about 1.06

OpenStudy (anonymous):

oh lol its in feet

OpenStudy (anonymous):

this has to be converted to meters in order to use most physics formulas

OpenStudy (anonymous):

can you tell me b and c quick? im sorry to rush gotta go soon

OpenStudy (anonymous):

well a doesnt need to be converted to meters a second, so its 87.6

OpenStudy (anonymous):

i mean b

OpenStudy (anonymous):

okay

OpenStudy (anonymous):

and c?

OpenStudy (anonymous):

and c i got .9518 seconds after converting

OpenStudy (anonymous):

it didnt work neither did but thank you

OpenStudy (anonymous):

its those conversions

OpenStudy (anonymous):

Do you have the answers, are you trying to know how to do it?

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