Explanation:
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A car travels between two towns 80 miles apart in 2 hours. What is its average speed?
2 answers:
Answer:
Average speed of the car is 40 miles per hour
Explanation:
It is given that,
Distance covered by the car, d = 80 miles
Time taken by the car, t = 2 hours
We need to find the average speed of the car. It is given by :
v = 40 miles/hour
So, the average speed of the car is 40 miles per hour. Hence, this is the required solution.
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Explanation:
The given data is as follows.
= 400 K,
= 500 K,
= 25 kJ = 25000 J (as 1 kJ = 1000 J)
Now, we will calculate the change in entropy as follows.
Putting the given values into the above formula as follows.
=
= 250 J/K
Hence, we can conclude that change in entropy is 250 J/K.
Answer:
The angular speed of the wheel is 0.452 rad/s
Explanation:
The angle through which the car wheel turns, Δθ = 277° = 277/360 × 2·π radian
The time it takes for the car wheel to turn, Δt = 10.7 s
The angular speed, ω is given by the following equation;
Substituting the known values for Δθ and Δt gives;
The angular speed of the wheel = 0.452 rad/s