Question
Rosie (mass 41 kg) pushes a box with a horizontal
force of 140 N (31.472 lb) at a speed
25 m/min.
A. What is Rosie’s power output?
Answer in units of W.
B.What energy is produced by a 300 W lightbulb
lit for 4.1 hours?
Answer in units of J
force of 140 N (31.472 lb) at a speed
25 m/min.
A. What is Rosie’s power output?
Answer in units of W.
B.What energy is produced by a 300 W lightbulb
lit for 4.1 hours?
Answer in units of J
Answers
Chanz
P = W/t or in this case P = Fv
change the m/min into m/sec
b) Just rearrange E = Pt. Again change units into seconds, not hours
change the m/min into m/sec
b) Just rearrange E = Pt. Again change units into seconds, not hours