Barobo
PortalSign In
HomeShopTutorialsFree CurriculumHour of Code
RoboBlockly for Learning Math and Coding

Piano
Linkbot Image Mindstorm Image Cursor Image
0x48362412-12-24-36-48y48362412-12-24-36-48
Grid:
Tics Lines:
Width px
Hash Lines:
Width px
Labels:
Font px
Trace Lines:
Robot 1:
Width px
Robot 2:
Width px
Robot 3:
Width px
Robot 4:
Width px
Labels: x-axis y-axis Show Grid
Grid: 12x12 inches 24x24 inches 36x36 inches
72x72 inches 96x96 inches 192x192 inches
Quad: 4 Quadrants 1 Quadrant 1&4 Quadrants
Units: US Customary Metric
Background: Background Image

Robot 1

Linkbot
Mindstorm
Initial Position:
( in, in)
Initial Angle:
deg
Current Position: (0 in, 0 in)
Current Angle: 90 deg
Wheel Radius:
Track Width:
in

Robot 2

Linkbot
Mindstorm
Initial Position:
( in, in)
Initial Angle:
deg
Current Position: (12 in, 0 in)
Current Angle: 90 deg
Wheel Radius:
Track Width:
in

Robot 3

Linkbot
Mindstorm
Initial Position:
( in, in)
Initial Angle:
deg
Current Position: (24 in, 0 in)
Current Angle: 90 deg
Wheel Radius:
Track Width:
in

Robot 4

Linkbot
Mindstorm
Initial Position:
( in, in)
Initial Angle:
deg
Current Position: (36 in, 0 in)
Current Angle: 90 deg
Wheel Radius:
Track Width:
in
Use Proportions to Animate an Hourglass
/* Code generated by RoboBlockly v2.0 */
#include <chplot.h>
double i;
double y;
double x;
double x2;
double yBot;
double xBot1;
double xBot2;
CPlot plot;

for(i = 1; i <= 18; i += 0.25) {
  plot.strokeColor("black");
  plot.fillColor("#ccffff");
  plot.triangle(0, 0, 18, -34, -18, -34);
  plot.triangle(0, 0, 18, 34, -18, 34);
  plot.noStrokeColor();
  plot.fillColor("#996633");
  y = 18 - i;
  x = (0.592 - 0.05) * y;
  x2 = (-0.592 + 0.05) * y;
  plot.triangle(x, y, 0, 0, x2, y);
  yBot = -34 + i * 0.25;
  xBot1 = (0.592 - 0.05) * yBot;
  xBot2 = (-0.592 + 0.05) * yBot;
  plot.quad(-18, -34, 18, -34, xBot2, yBot, xBot1, yBot);
  delaySeconds(0.03);
}

plot.label(PLOT_AXIS_XY, "");
plot.grid(PLOT_OFF);
plot.tics(PLOT_AXIS_XY, PLOT_OFF);
plot.axis(PLOT_AXIS_XY, PLOT_OFF);
plot.axisRange(PLOT_AXIS_XY, -48, 48);
plot.ticsRange(PLOT_AXIS_XY, 12);
plot.sizeRatio(1);
plot.plotting();
Load Blocks
Hardware
LArduino
Workspace Show Ch Save File
Problem Statement:
The pre-placed blocks animate the sand decreasing from the top of the hourglass. If the ratio of the rate of sand decreasing on the top to the rate of sand increasing on the bottom is 4:1, write an expression in terms of i for the variable yBot to increase the sand on the bottom at the correct rate.

		
Rubbish bin
Time