Answer:
B. 17.15 watts
Explanation:
Given that
Time = 10 seconds
height = distance = 0.7 meters
weight of sack = mg = F = 245 newtons
Power = work done/ time taken
Where work done = force × distance
Substituting the given parameters into the formula
Work done = 245 newton × 0.7 meters
Work done = 171.5 J
Recall,
Power = work done/time
Power = 171.5 J ÷ 10
Power = 17.15 watts
Hence the power expended is B. 17.15 watts
Answer: That’s a sankey diagram
Explanation:
The change in velocity is +4 m/s to the right (or -4 m/s to the left).
The object's mass is irrelevant.
The 50 W bulb would have a greater current than the 90 W bulb
