Answer:
(a) 950J
(b) 216 W
(c) 316.67 W
Explanation:
(a) If the skier is moving at a constant speed, then his kinetic energy is unchanged. The work done by the rope is the same for speed at 2.2m/s as it is for 1.5m/s. It is 950J
(b) When the speed is 1.5m/s then the time it would take to move up a distance of 6.6 m is 6.6 / 1.5 = 4.4 s
If the work is 950J over 4.4s then the rate of work is 950 / 4.4 = 216 W
(c) When the speed is 2.2 m/s then the time it would take to move up a distance of 6.6 m is 6.6 / 2.2 = 3 s. If the work is 950J over 3s then the rate of work is 950 / 3 = 316.67 W
The work done is 1425 J
Explanation:
The work done by a force to move an object is given by

where
F is the magnitude of the force
d is the displacement
is the angle between the direction of the force and of the displacement
For the suitcase in this problem, we have:
F = 95.0 N is the force applied
d = 15.0 m is the displacement
, since the force is parallel to the displacement
Substituting, we find

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Answer:
Explanation:
The answer is B.
B) C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g)
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