The number of identical balls that can be made from a given amount of plastic is inversely proportional to the radius of each ball cubed.When the radius is 2mm,the number of balls is 350.Find the number of balls with a radius of 5mm,made of same amou?

assuming that the balls are spherical, we know the formula of a sphere to be: (4/3)(pi)(r^3) let’s say the number of balls produced from the the is “x”, then we know x is inversely proportional to (1/r^3) and therefore: x = k * (1/r^3) plugging in the numbers we have: 350 = k * (1/0.002^3) rearrange for k: k = 350 * (0.002^3) = 2.8*10^-6 now our formula is: x = 2.8*10^-6 * (1/r^3) we plug in 0.005 and we get: x = 2.8*10^-6 * (1/0.005^3)= 22.4 ~ 22

Nadeem Alom

415 students helped

Maths Tutor

What is Q&A on Scoodle?

At Scoodle we understand that everyone learns in a different way. Some people learn through practice, using essays and notes; others prefer video lessons to watch and learn, some just need help with a specifically hard question, while some learn best 1-on-1 tutoring sessions. At Scoodle we cater for all types of learning styles and needs. From GCSE Maths video lessons to A-level English essays and specialist educators in every subject - we’ve got you covered.

Scoodle has helped over 131,000 students so far

5 Maths tutors available now

Verified

Shaheer Ahmed

ProOnline lessons

A tutor above the rest

My greatest passion in life is learning and my second greatest passion is teaching which also involves learning. A little bit about me. I was raised in Turkey, France, Pakistan and the UK. I've experienced great success throughout my life due to the amazingly approachable, friendly and unforgettable teachers that I've studied with and from. This, in fact, is the foundation of my commitment to helping my students. I've been tutoring and teaching for 6 years in small and large groups, 1 to 1 lessons to classrooms, from secondary to university students. Feel free to ask me about anything.

£25Per hour

Verified

Sherika Logan

ProOnline lessons

Experienced tutor and undergraduate at University of Bristol

Specialising in Maths Tuition. I have graduated with a Maths degree from Bristol in 2012 and since then I have worked in Finance and provided private maths tuition up to GCSE. My approach to tutoring is simple but effective. I would like to have a conversation with the student before our first session in order to understand what their weakness is. I will then work with the students on topics they are struggling with or don't understand with intermediate tests in between to make sure methods are understood. This then helps them persevere at school as they understand concept and exams.

£20Per hour

317Students helped

Verified

Rachel Dark

ProOnline lessons

A tutor that understands you

Hi, I'm Rachel! I am currently studying Biology as an undergraduate at University College London and have gained a lot of experience tutoring in the subject over the past couple of years. I love the depth and breadth that Biology offers and I would love to share my passion for the subject with others. I believe in tailoring my education to each individual student, as everyone learns slightly differently so it makes sense to have a lesson that is specifically designed for them. I take time in planning my lessons and work with each student to find the harder topics that need a bit more attention. I am more than happy to answer any questions you have!

£18Per hour

274Students helped

Verified

Sari Zemerly

Online lessons

Passionate Tutor and Medical Student Studying at St Georges University of London

Foundation Year One Doctor that tutors subjects like Biology, Chemistry, Maths, Business Management, English and Arabic. I have tutored several different students in the Sciences. I believe that a tailored approach for each student suits them best and prepare my sessions prior to delivering them online or within the comfort of my students’ homes. I am fluent in English and Arabic and also regularly teach those languages as well.

£25Per hour

Verified

Moosa Ali

Online lessons

Savvy tutor and undergraduate at University College London (UCL)

-------------------Summary---------------------- My teaching style is geared towards developing confident students that thrive in exams, and I incorporate evidence-based strategies for academic success. ------------------Background-------------------- • Currently an Undergraduate student at UCL. • Achieved A*A*A at A Levels, in Maths, Economics and Further Maths, and 12A*s and 2As at GCSE. • With two years of experience in Tutoring Maths (GCSE and A Level), coaching for 11+, I have developed a deeper understanding of pedagogy and effective teaching styles Please do contact me if you, or your son/daughter might be interested in my tutoring services!

£25Per hour

1,306Students helped