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Slav-nsk [51]
4 years ago
10

Is work being done if you push a child in a wagon​

Physics
2 answers:
Leto [7]4 years ago
6 0

yes. youre using energy to make the wagon with the child in the wagon

erastova [34]4 years ago
6 0
Yes, The Work Would Be You Push The Wagon And The Child Which Adds Extra Weight, Which Is More Energy
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A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift i
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Answer:

a) 9.8 kJ

b) 8.9 kJ

c) 8.1 kJ

Explanation:

On the first stage, we have:

v_i=0 m/s\\v_f=4.30m/s\\h=10m

applying the energy conservation formula:

W+K1+U1=K2+U2\\W=K2-K1+U2-U1\\W=\frac{1}{2}*91.0kg*(4.30m/s)^2-(0)+91.0kg*9.8*10-(0)\\\\W=9.8kJ

for stage 2:

v_i=4.30 m/s\\v_f=4.30m/s\\hi=10m\\hf=20m

W+K1+U1=K2+U2\\W=K2-K1+U2-U1\\W=\frac{1}{2}*91.0kg*(4.30m/s-4.30m/s)^2+91.0kg*9.8*(20-10)\\\\W=8.9kJ

for the final stage:

v_i=4.30 m/s\\v_f=0\\hi=20m\\hf=30m

W+K1+U1=K2+U2\\W=K2-K1+U2-U1\\W=(0)-\frac{1}{2}*91.0kg*(4.30m/s)^2+91.0kg*9.8*(30-20)\\\\W=8.1kJ

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3 years ago
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