IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: Assi1993 on December 06, 2010, 02:21:07 pm

Title: edexcel AS physics
Post by: 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?
Title: Re: edexcel AS physics
Post by: Deadly_king on December 07, 2010, 05:29:15 am: 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?

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 45^o 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
Title: Re: edexcel AS physics
Post by: Assi1993 on December 07, 2010, 01:38:06 pm: oh hey :)
jazakAllah khair for the second answer...
and umm...nothing is actually missing
Title: Re: edexcel AS physics
Post by: Deadly_king on December 07, 2010, 02:30:05 pm: 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

You're welcome. :)

Okay........I'll try it again later. Need to go now. ;)
Title: Re: edexcel AS physics
Post by: M-H on January 18, 2011, 11:01:32 am: 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
Title: Re: edexcel AS physics
Post by: ashish on January 20, 2011, 02:35:04 am: a=(v-u)/t
=(0-15)/0.1
=-150
this shows the deceleration

f=ma
=0.14*-150
=-21N
Title: Re: edexcel AS physics
Post by: Deadly_king on January 26, 2011, 02:07:41 pm: Quote from: Baller on January 18, 2011, 11:01:32 am
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

That's what i was looking for. :D

Not very nice of you to burden a king like me :P

Quote from: ashish on January 20, 2011, 02:35:04 am
a=(v-u)/t
=(0-15)/0.1
=-150
this shows the deceleration

f=ma
=0.14*-150
=-21N

Here is your solution Assi. :)

Thanks for your precious help ashish. :D

+rep
Title: Re: edexcel AS physics
Post by: ashish on February 05, 2011, 07:13:28 am: Quote from: Deadly_king on January 26, 2011, 02:07:41 pm
That's what i was looking for. :D

Not very nice of you to burden a king like me :P

Here is your solution Assi. :)

Thanks for your precious help ashish. :D

+rep

always here to help :D