Still helping my grandaughter with her studies. Can you answer these questions? Thankyou so much.
1.)A worker applies a force of 550N in sliding a block of wood 15.0m along a surface. The work output is determined to be 5.00x10^3 J. Calculate the workers efficiency.
2.)On a camping trip, the following scenario occurs:
I A camper rubs a match on a gritty surface igniting a match.
II The match is then used to ignited a pile of wood kindling, creating a bonfire
III While standing by the bonfire, the camper senses that the part of his body facing the fire is warm while his backside remains cool.
IV Another group of campers across the lake spots the bonfire.
Which of the above describes a conversion of mechanical energy to heat?
3.)Which of the above describes a conversion of radiant evergy heat? I, II, III OR IV?
Thankyou so much!
Thankyou I am so grateful.
2007-04-27
09:44:32
·
6 answers
·
asked by
Grandpa Donald
1
in
Physics