Compeleted orbit calculations

Author: kb122215

objects-and-math/studio/ObjectsStudio02.js

@@ -1,58 +1,97 @@
 // Code your orbitCircumference function here:
-
+function orbitCircumference(radius) {
+  return Math.round(2 * Math.PI * radius);
+}
 
 // Code your missionDuration function here:
-
+function missionDuration(numOrbits, radius = 2000, speed = 28000) {
+  let circumference = orbitCircumference(radius);
+  let distance = numOrbits * circumference;
+  let time = distance / speed;
+  return parseFloat(time.toFixed(2));
+}
 
 // Copy/paste your selectRandomEntry function here:
-
+function selectRandomEntry(arrayInput) {
+  return arrayInput[Math.floor(Math.random() * arrayInput.length)];
+}
 
 // Code your oxygenExpended function here:
-
+function oxygenExpended(candidate, radius = 2000, speed = 28000) {
+  let spacewalkTime = missionDuration(3, radius, speed);
+  let oxygenUsed = candidate.o2Used(spacewalkTime);
+  return `${
+    candidate.name
+  } will perform the spacewalk, which will last ${spacewalkTime} hours amd require ${oxygenUsed.toFixed(
+    3
+  )} kg of oxygen.`;
+}
 
 // Candidate data & crew array.
 let candidateA = {
-   'name':'Gordon Shumway',
-   'species':'alf',
-   'mass':90,
-   'o2Used':function(hrs){return 0.035*hrs},
-   'astronautID':414
- };
- let candidateB = {
-   'name':'Lassie',
-   'species':'dog',
-   'mass':19.1,
-   'o2Used':function(hrs){return 0.030*hrs},
-   'astronautID':503
- };
- let candidateC = {
-   'name':'Jonsey',
-   'species':'cat',
-   'mass':3.6,
-   'o2Used':function(hrs){return 0.022*hrs},
-   'astronautID':796
- };
- let candidateD = {
-   'name':'Paddington',
-   'species':'bear',
-   'mass':31.8,
-   'o2Used':function(hrs){return 0.047*hrs},
-   'astronautID':291
- };
- let candidateE = {
-   'name':'Pete',
-   'species':'tortoise',
-   'mass':417,
-   'o2Used':function(hrs){return 0.010*hrs},
-   'astronautID':599
- };
- let candidateF = {
-   'name':'Hugs',
-   'species':'ball python',
-   'mass':2.3,
-   'o2Used':function(hrs){return 0.018*hrs},
-   'astronautID':890
- };
- 
- let crew = [candidateA,candidateC,candidateE];
- 
+  name: "Gordon Shumway",
+  species: "alf",
+  mass: 90,
+  o2Used: function (hrs) {
+    return 0.035 * hrs;
+  },
+  astronautID: 414,
+};
+let candidateB = {
+  name: "Lassie",
+  species: "dog",
+  mass: 19.1,
+  o2Used: function (hrs) {
+    return 0.03 * hrs;
+  },
+  astronautID: 503,
+};
+let candidateC = {
+  name: "Jonsey",
+  species: "cat",
+  mass: 3.6,
+  o2Used: function (hrs) {
+    return 0.022 * hrs;
+  },
+  astronautID: 796,
+};
+let candidateD = {
+  name: "Paddington",
+  species: "bear",
+  mass: 31.8,
+  o2Used: function (hrs) {
+    return 0.047 * hrs;
+  },
+  astronautID: 291,
+};
+let candidateE = {
+  name: "Pete",
+  species: "tortoise",
+  mass: 417,
+  o2Used: function (hrs) {
+    return 0.01 * hrs;
+  },
+  astronautID: 599,
+};
+let candidateF = {
+  name: "Hugs",
+  species: "ball python",
+  mass: 2.3,
+  o2Used: function (hrs) {
+    return 0.018 * hrs;
+  },
+  astronautID: 890,
+};
+
+let crew = [candidateA, candidateC, candidateE];
+
+let numOrbits = 5;
+let orbitRadius = 2000;
+let orbitalSpeed = 28000;
+let totalDistance = orbitCircumference(orbitRadius) * numOrbits;
+let totalDuration = missionDuration(numOrbits, orbitRadius, orbitalSpeed);
+console.log(
+  `The mission will travel ${totalDistance} km around the planet, and it will take ${totalDuration} hours to complete.`
+);
+let selectedCrewMember = selectRandomEntry(crew);
+console.log(oxygenExpended(selectedCrewMember));