A group of students is asked to determine the diameter of a large inflatable beach ball.
One student uses a long piece of string to find the circumference of the ball. He then calculates the diameter. (a) Suggest one practical difficulty in measuring the circumference of the ball. (b) (i) Describe a different method that another student may use to measure directly the diameter of the beach ball.
You may include a diagram in your answer. (ii) Suggest two ways in which the student in (b)(i) can make the measurement of the diameter accurate.
Answers
Answer:
< !DOCTYPE html > < html > < head > < title > 3D Animation < /title > < /head > < body > < div class="stage" style="width: 120px; height: 120px;" > < div class="cubespinner" > < div class="face1" > Nikhil < /div > < div class="face2" > Cricketer < /div > < div class="face3" > Your_Freind < /div > < div class="face4" > Heroic < /div > < div class="face5" > Phenomenol < /div > < div class="face6" > Man_Mortal < /div > < /div > < /div > < style > body { margin: 100px 50px 50px 50px; } @-webkit-keyframes spincube { from,to { -webkit-transform: rotateX(0deg) rotateY(0deg) rotateZ(0deg); } 16% { -webkit-transform: rotateY(-90deg); } 33% { -webkit-transform: rotateY(-90deg) rotateZ(90deg); } 50% { -webkit-transform: rotateY(-180deg) rotateZ(90deg); } 66% { -webkit-transform: rotateY(-270deg) rotateX(90deg); } 83% { -webkit-transform: rotateX(90deg); } } @keyframes spincube { from,to { -moz-transform: rotateX(0deg) rotateY(0deg) rotateZ(0deg); -ms-transform: rotateX(0deg) rotateY(0deg) rotateZ(0deg); transform: rotateX(0deg) rotateY(0deg) rotateZ(0deg); } 16% { -moz-transform: rotateY(-90deg); -ms-transform: rotateY(-90deg); transform: rotateY(-90deg); } 33% { -moz-transform: rotateY(-90deg) rotateZ(90deg); -ms-transform: rotateY(-90deg) rotateZ(90deg); transform: rotateY(-90deg) rotateZ(90deg); } 50% { -moz-transform: rotateY(-180deg) rotateZ(90deg); -ms-transform: rotateY(-180deg) rotateZ(90deg); transform: rotateY(-180deg) rotateZ(90deg); } 66% { -moz-transform: rotateY(-270deg) rotateX(90deg); -ms-transform: rotateY(-270deg) rotateX(90deg); transform: rotateY(-270deg) rotateX(90deg); } 83% { -moz-transform: rotateX(90deg); -ms-transform: rotateX(90deg); transform: rotateX(90deg); } } .cubespinner { -webkit-animation-name: spincube; -webkit-animation-timing-function: ease-in-out; -webkit-animation-iteration-count: infinite; -webkit-animation-duration: 12s; animation-name: spincube; animation-timing-function: ease-in-out; animation-iteration-count: infinite; animation-duration: 12s; -webkit-transform-style: preserve-3d; -moz-transform-style: preserve-3d; -ms-transform-style: preserve-3d; transform-style: preserve-3d; -webkit-transform-origin: 60px 60px 0; -moz-transform-origin: 60px 60px 0; -ms-transform-origin: 60px 60px 0; transform-origin: 60px 60px 0; } .cubespinner div { position: absolute; width: 300px; height: 300px; background: rgba(255,255,255,0.9); line-height:200px; text-align: center; font-size: 50px; } .cubespinner .face1 { color: CadetBlue; -webkit-transform: translateZ(60px); -moz-transform: translateZ(60px); -ms-transform: translateZ(60px); transform: translateZ(60px); } .cubespinner .face2 { color: ForestGreen; -webkit-transform: rotateY(90deg) translateZ(60px); -moz-transform: rotateY(90deg) translateZ(60px); -ms-transform: rotateY(90deg) translateZ(60px); transform: rotateY(90deg) translateZ(60px); } .cubespinner .face3 { color: blue; -webkit-transform: rotateY(90deg) rotateX(90deg) translateZ(60px); -moz-transform: rotateY(90deg) rotateX(90deg) translateZ(60px); -ms-transform: rotateY(90deg) rotateX(90deg) translateZ(60px); transform: rotateY(90deg) rotateX(90deg) translateZ(60px); } .cubespinner .face4 { color: orange; -webkit-transform: rotateY(180deg) rotateZ(90deg) translateZ(60px); -moz-transform: rotateY(180deg) rotateZ(90deg) translateZ(60px); -ms-transform: rotateY(180de g) rotateZ(90deg) translateZ(60px); transform: rotateY(180deg) rotateZ(90deg) translateZ(60px); } .cubespinner .face5 { color: red; -webkit-transform: rotateY(-90deg) rotateZ(90deg) translateZ(60px); -moz-transform: rotateY(-90deg) rotateZ(90deg) translateZ(60px); -ms-transform: rotateY(-90deg) rotateZ(90deg) translateZ(60px); transform: rotateY(-90deg) rotateZ(90deg) translateZ(60px); } .cubespinner .face6 { color: DarkSlateGray; -webkit-transform: rotateX(-90deg) translateZ(60px); -moz-transform: rotateX(-90deg) translateZ(60px); -ms-transform: rotateX(-90deg) translateZ(60px); transform: rotateX(-90deg) translateZ(60px); } < /style > < /body > < /html >