Physics 2 mc questions need help (1 Viewer)

[gsccrepping]

Can anybody explain how to do either of these?

The answer is B for both (links provided below)

Q1

Q2

Thanks

 

[Drsoccerball]

Firstly calculate the time taken to do a whole parabola from his starting point to the next time he passes the board. This gives you a value of 0.5 seconds to complete the rest of the journey. Since the velocity is symmetrical u=17.1 m/s.





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[gsccrepping]

Firstly calculate the time taken to do a whole parabola from his starting point to the next time he passes the board. This gives you a value of 0.5 seconds to complete the rest of the journey. Since the velocity is symmetrical u=17.1 m/s.





~

Wait sorry, how do you calculate the first part to get .5 seconds?

 

[Drsoccerball]

Wait sorry, how do you calculate the first part to get .5 seconds?

 

[atargainz]

Wait sorry, how do you calculate the first part to get .5 seconds?

Just use that formula subbing in t=4, Uy=17.1 and you'll get -10.

t=4 because he is in the in the air for 4 seconds, insinuating at 4 seconds he will hit the water. Subbing in t=4 will give you the y displacement from the cliff (ie where he was standing)

 

[malcolm21]

How do you do his first question?

 

[gsccrepping]

Okay yea I got it, lol mb. Thanks

How do you do his first question?

And yeah anybody know how to do the 1st question?

 

[123ryoma12]

I tried doing your first question and got 0.012 newtons
F = mv^2/r
v = 2pi0.25/6.52
m = 0.05
r = 0.25
= 0.012 newtons.
Where did you get this question from?
I think it's wrong cause 8.5 newtons when dealing with such a slow speed and low mass doesn't sound right
or maybe i'm just doing something wrong.

 

[malcolm21]

I tried doing your first question and got 0.012 newtons
F = mv^2/r
v = 2pi0.25/6.52
m = 0.05
r = 0.25
= 0.012 newtons.
Where did you get this question from?
I think it's wrong cause 8.5 newtons when dealing with such a slow speed and low mass doesn't sound right
or maybe i'm just doing something wrong.

yeah thats what i got too

 

[atargainz]

yeah thats what i got too

same

 

[gsccrepping]

I tried doing your first question and got 0.012 newtons
F = mv^2/r
v = 2pi0.25/6.52
m = 0.05
r = 0.25
= 0.012 newtons.
Where did you get this question from?
I think it's wrong cause 8.5 newtons when dealing with such a slow speed and low mass doesn't sound right
or maybe i'm just doing something wrong.

Pretty sure it was cheltenham girls or some shit. But yeah that's what I got aswell, so I think we're right and the paper is wrong.

 

[keepLooking]

I got 0.01160845864

Pretty sure it was cheltenham girls or some shit. But yeah that's what I got aswell, so I think we're right and the paper is wrong.

The question isn't wrong, it may just be trying to troll anyone as mentions 'closest to that required'

 

[123ryoma12]

I got 0.01160845864



The question isn't wrong, it may just be trying to troll anyone as mentions 'closest to that required'

closest is A though (4N) but the answer was B (8N)

 

[keepLooking]

closest is A though (4N) but the answer was B (8N)

Oh okay. I apologise then.