What is a risk of using chemical pesticides on crops?
1 answer:
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Answer:
Energy = 0.25 kilowatt-hour
Explanation:
Given the following data;
Power = 25 Watts
Time = 10 hours
Power can be defined as the energy required to do work per unit time.
Mathematically, it is given by the formula;
To find the energy consumed;
Energy = power * time
Substituting into the formula, we have;
Energy = 25 * 10
Energy = 250 Watt-hour
To convert to kilowatt-hour, we would divide by 1000;
Energy = 250/1000
Energy = 0.25 kilowatt-hour
Answer:
The work done on the crate by the truck is 9472.54 J.
Explanation:
Given that,
Mass of the truck, m = 65.4 kg
Initially, the object is at rest, u = 0
Final speed of the truck, v = 61.3 km /h = 17.02 m/s
m/s
Time, t = 15.2 s
We need to find the work done on the crate by the truck. The work done is equal to the change in kinetic energy of the truck as :
So, the work done on the crate by the truck is 9472.54 J. Hence, this is the required solution.