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Assi1993:
hey everyone :)..i hv these questions from the book..
(pg 47)
Q1: A hockey player passes the ball at 15m/s to a team mate who stops it completely at 0.1s.What force does the reciever's stick have to apply to the ball?

Q2:A penality stroke is flicked from a distance of 6.40m from the goal line.The striker scoops it so that the ball leaves the ground at 45degree angle at a speed of 8m/s.How long does the goal keeper has to make a save before the ball crosses the goal line?

Deadly_king:

--- Quote from: Assi1993 on December 06, 2010, 02:21:07 pm ---hey everyone :)..i hv these questions from the book..
(pg 47)
Q1: A hockey player passes the ball at 15m/s to a team mate who stops it completely at 0.1s.What force does the reciever's stick have to apply to the ball?

Q2:A penality stroke is flicked from a distance of 6.40m from the goal line.The striker scoops it so that the ball leaves the ground at 45degree angle at a speed of 8m/s.How long does the goal keeper has to make a save before the ball crosses the goal line?


--- End quote ---

1. Is the question complete? I mean, it seems that something is lacking. :-[

Can you please provide the answers as well?


2. So horizontal distance S from goal line = 6.40 m

The speed at 45o is 8 ms-1. Now you need to find the horizontal component of the speed which will be (8cos 45) = 5.66 ms-1.

Speed = distance/time -----> Time taken for ball to reach goal line = 6.4/5.66 = 1.13s

Assi1993:
oh hey :)
jazakAllah khair  for the second answer...
and umm...nothing is actually missing

Deadly_king:

--- Quote from: Assi1993 on December 07, 2010, 01:38:06 pm ---oh hey :)
jazakAllah khair  for the second answer...
and umm...nothing is actually missing

--- End quote ---

You're welcome. :)

Okay........I'll try it again later. Need to go now. ;)

M-H:
Hey Assi, the mass of the ball is given in one of the places where they're talking about the hockey thing. Its 0.14 kg Dead :P :D
Yeah, I am too lazy to type the solution...but I've provided King and he can show that to you :)

Sorry for the laziness :D..King-thanks for being there so that we can burden you. :D

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