7. A 1.50 x 103 kg car accelerates uniformly from rest to 10.0 m/s in 3.00 s.
1 answer:
75,000J
25,000W
Explanation:
Given parameters:
Mass of car = 1500kg
Velocity = 10m/s
time taken = 3s
Unknown:
Work done = ?
Power delivered by engine = ?
Solution:
Work done here is the kinetic energy possessed by the car as it covers the distance.
Work done and energy are related quantities.
Work done = Kinetic energy = mv²
m is the mass of the body
v is the velocity
Therefore, inputting the parameters gives:
K.E = x 1500 x 10² = 75,000J
The work done is 75,000J
Power is the rate at which work is done:
Power =
Power = = 25000W
learn more:
Kinetic energy brainly.com/question/9059731
Power supply brainly.com/question/4322575
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Answer: 8.691 mols of CO₂
Explanation:
To find the number of moles in a given grams, you want to use the molar mass.
Let's first find the molar mass of CO₂.
Carbon's molar mass is 12.011 g/mol
Oxygen's molar mass is 15.999 g/mol
To find molar mass of CO₂, we want to add up the molar mass of carbon and oxygen. Remember, there are 2 Oxygens so we need to mulitply that by 2.
12.011+2(15.999)=44.009 g/mol
Now that we have molar mass, we can convert 382.5 g to mols.
There are about 8.691 mols of CO₂.