A ball is dropped from the leaning tower of Pisa, at a height of 50m from the ground. The ball is dropped from rest and falls freely under gravity. How long will it be before the ball hits the ground?

We know: s = 50, a = 9.8, u = 0 and we want to find t.

The equation connecting these four is s = ut + ½ at^{2}

So 50 = 0 + ½ × 9.8 × t^{2}
Rearranging: t^{2} = 10.20408
t = 3.19…
the time taken is 3.19s (3sf)

CAN SOMEONE ASSIST ME BY EXPLAINING HOW THEY GOT THE 3.19 BECAUSE TO MY UNDERSTANDING I UNDERSTAND THAT YOU HAVE TO RE ARRANGE THE FORMULA AND MAKE "T" THE SUBJECT OF THE FORMULA BECAUSE THATS WHAT WE WERE ASKED TO FIND

i also need so much help. cant do anything with moles!!!

Hi,

1 mole is it's relative atomic mass in grams

To work out how many moles are of an element, use the formula;

no of moles= mass(g) divided by R.A.M

For example, "How many moles of sodium are there in 2.3g?"

2.3/23=0.1 so there are 0.1 moles.

Hope this helped, but im a bit rubbish at explaining thingss :P Good Luck!

Hi,

1 mole is it's relative atomic mass in grams

To work out how many moles are of an element, use the formula;

no of moles= mass(g) divided by R.A.M

For example, "How many moles of sodium are there in 2.3g?"

2.3/23=0.1 so there are 0.1 moles.

Hope this helped, but im a bit rubbish at explaining thingss :P Good Luck!

Hi,

1 mole is it's relative atomic mass in grams

To work out how many moles are of an element, use the formula;

no of moles= mass(g) divided by R.A.M

For example, "How many moles of sodium are there in 2.3g?"

2.3/23=0.1 so there are 0.1 moles.

Hope this helped, but im a bit rubbish at explaining thingss :P Good Luck!

helo.i saw your post and think i can be of help to you

You could try this section of the site:

http://www.revisionworld.com/a2-level-level-revision/chemistry/atoms-moles-equations

A ball is dropped from the leaning tower of Pisa, at a height of 50m from the ground. The ball is dropped from rest and falls freely under gravity. How long will it be before the ball hits the ground?

We know: s = 50, a = 9.8, u = 0 and we want to find t.

The equation connecting these four is s = ut + ½ at

^{2}So 50 = 0 + ½ × 9.8 × t

^{2}Rearranging: t

^{2}= 10.20408t = 3.19…

the time taken is

3.19s(3sf)CAN SOMEONE ASSIST ME BY EXPLAINING HOW THEY GOT THE 3.19 BECAUSE TO MY UNDERSTANDING I UNDERSTAND THAT YOU HAVE TO RE ARRANGE THE FORMULA AND MAKE "T" THE SUBJECT OF THE FORMULA BECAUSE THATS WHAT WE WERE ASKED TO FIND

which calculations? molar? redox? thermo?