Jstylez9712
29.12.2020 •
Physics
A radio-controlled car powered by an electric motor accelerates from rest to 0.800 m/s in 23.0 ms. The total mass of the car is 675 g. What is the average power (in W) delivered to the car by the motor during its acceleration
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Ответ:
9.39Watts
Explanation:
The work done by the car is converted to kinetic energy. Hence;
Work done = Kinetic energy =1/2mv²
Time t = 23ms =23×10^-3s
Mass = 675g = 0.675kg
v = 0.8m/s
Work done = 1/2(0.675)0.8²
Work done = 0.216Joules
Average power = Work done/Time
Average power = 0.216/0.023
Average power = 9.39Watts
Hence the average power (in W) delivered to the car by the motor during its acceleration is 9.39Watts
Ответ:
The answer is; C
A calorie is a unit of energy used to describe the energy required to raise the temperature of one gram of water by one degree at an ambient pressure of 1 atmosphere. This SI unit has gained popularity in its use in nutrition where the energy in a particular type of food (carbohydrates, proteins, and fats) is measured in calories.