Question

Your friend is trapped on the 12th floor of Jonsson Tower and is getting hungry. You decide to

help them by setting up a sandwich cannon at the base of the tower and firing a 0.5 kg sandwich

straight upwards.

A) You want to use the smallest possible amount of explosive to launch the sandwich. Your

preferred explosive delivers about 2 MJ/kg. How much do you need to use?

B) How fast should the sandwich be moving when it leaves the cannon?

C) Repeat your calculations, but for a sandwich with a mass of 1 kg. Form two ratios. One ratio

will compare the amount of explosive needed for the small sandwich to the amount of explosive

needed for the big sandwich. The other will compare the launch speed of the two sandwiches.

Write a couple sentences comparing the ratios and explaining why they are different.

the professor says the height could randomly assigned by ourself

Answer 1