4.14 Entrance Activity Answers

·         You can run up the stairs in the Science block in 30 seconds.

·         Mr. Roff can run up the stairs in the Science block in 20 seconds.

·         Who is the most powerful?  Why?

·         Mr Roff.  He does more work running up the stairs (because has a higher weight) in a shorted time so he is more powerful

 

·         It takes 2 minutes to fill the 20 litre sinks in this room with water. 

·         How fast is the sink filling?

·         10 litres/min

·         At what rate is the sink filling?

·         10 litres/min

·         How long would it take to fill a 10 litre sink?

·         1 min