This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
ScanSolve AI Answer
Step 1: Calculate the total energy consumed by the kettle. The total cost of electricity for using the kettle is K80.00, and the cost per unit is K0.65 per kWh. Total Energy (kWh) = Total CostCost per unit Total Energy (kWh) = K80.00K0.65/kWh Total Energy (kWh) ≈ 123.0769 kWh Step 2: Calculate the total operating time of the kettle in hours. The kettle takes 5 minutes to boil water, and it is used for 30 days. Assuming it is used once per day: Total Operating Time (minutes) = 5 minutes/day × 30 days Total Operating Time (minutes) = 150 minutes Convert the total operating time from minutes to hours: Total Operating Time (hours) = 150 minutes60 minutes/hour Total Operating Time (hours) = 2.5 hours Step 3: Calculate the power rating of the kettle. The power rating (in kW) is the total energy consumed divided by the total operating time. Power (kW) = Total Energy (kWh)Total Operating Time (hours) Power (kW) = 123.0769 kWh2.5 hours Power (kW) ≈ 49.23076 kW Rounding to two decimal places, the power rating is 49.23 kW. This matches option C. The final answer is C. 49.23kW That's 2 down. 3 left today — send the next one.