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1. A weightlifter applies 210 J of work to tire that weighs 85 N. How far does it move?
2. How long does it take to do 500 joules of work with 25 watts of power?
3. A person riding his bicycle has a weight of 45 N during a quick 30 m trail. if it takes him 600 seconds to complete the trail. How much power did he do?

Sagot :

Answer:

1) 2.47 meters

2) 20 seconds

3) 2.25 watts

Explanation:

1. W = F x S

S = W/F

= 210/85

= 42/17 m

= 2.47 meters

2. P = W/t

t = W/P

= 500/25

= 20 seconds

3. P = W/t

P = F x S/t

= 45 x 30 / 600

= 45/20

= 2.25 watts

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