a) The moon has a diameter of 3476 km. How does the surface area of the moon compare with the surface area of the smallest planet in the solar system? What assumption have you made?
b) How many times as great is the volume of the sun as the combined volumes of all the planets in the solar system?
You are leaving Calgary at 13:00 on a Friday to fly to Zurich, Switzerland, via Toronto. If your plane averages 850 km/h, and you stop for 1 h in Toronto, at about what time on what day will you land in Zurich?
Suppose that you * place two identical coins as shown in the diagram * press firmly on the bottom coin * roll the top coin around the bottom one until the top coin returns to its original position.
a) Predict how many times the rolling coin turns around its centre as it rolls around the stationary coin.
b) Test your prediction.
c) Explain your observation.
In a descending number, such as 743, each digit is greater than the digit on the right. How many descending numbers are there between 500 and 600?
A clock’s minute hand is 10 cm long, and its hour hand is 7 cm long. Find the total distance moved by the tips of both hands in a 24-h period.