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Sagot :
Answer:
a. 1.1 MJ
b. 1.1 MJ
Explanation:
The energy used (E) is equal to the power (P) times the time (t). The time it takes to complete the race is equal to the distance (d) divided by the speed (v).
a. The time it takes Jessie to complete the course is:
t = d / v
t = (4.0 km) / (15 km/hr)
t = 0.267 hr
t = 960 s
The energy used in that time is:
E = Pt
E = (1150 W) (960 s)
E = 1,104,000 J
Converting to megajoules and rounded to two significant figures:
E = 1.1 MJ
b The time it takes Jessie to complete the course is:
t = d / v
t = (4.0 km) / (5 km/hr)
t = 0.8 hr
t = 2880 s
The energy used in that time is:
E = Pt
E = (380 W) (2880 s)
E = 1,094,400 J
Converting to megajoules and rounded to two significant figures:
E = 1.1 MJ
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