A student weighing 734 N climbs at constant
speed to the top of an 12 m vertical rope in
15 s.
What is the average power expended by the
student to overcome gravity?
Answer in units of W
002 10.0 points
How long does it take a 19 kW steam engine
to do 6.6 × 107 J of work?
Answer in units of s
If poissible put at least 3 decmil places
speed to the top of an 12 m vertical rope in
15 s.
What is the average power expended by the
student to overcome gravity?
Answer in units of W
002 10.0 points
How long does it take a 19 kW steam engine
to do 6.6 × 107 J of work?
Answer in units of s
If poissible put at least 3 decmil places
-
question 1
Find Work done then divide by time
F x D = E
P = E / T
734 x 12 =8808J You can use 734 because there are no net forces due to constant speed
8808/15 = 587.200w
Question 2
when you said 6.6 x107 j did you mean
6.6 x 10^7 ?
well Power = Total energy divided by time
therefore
6.6x10^7 / 19000 = 3473.684 seconds
or 57.895 minutes
Find Work done then divide by time
F x D = E
P = E / T
734 x 12 =8808J You can use 734 because there are no net forces due to constant speed
8808/15 = 587.200w
Question 2
when you said 6.6 x107 j did you mean
6.6 x 10^7 ?
well Power = Total energy divided by time
therefore
6.6x10^7 / 19000 = 3473.684 seconds
or 57.895 minutes