keerthy took 60 minutes to cycle 25km. After that she increased her average speed by 5kmph. How long will it take her to cover the next 25km, if she maintains the new average speed
Answers
Answered by
0
avg speed1=25kmph
avg speed2=30kmph
time=25/30=5/6 hr
avg speed2=30kmph
time=25/30=5/6 hr
Answered by
1
According to Newton’s law of cooling, we have:

Where,
Temperature of the body = T
Temperature of the surroundings = T 0 = 20°C
K is a constant
Temperature of the body falls from 80°C to 50°C in time, t = 5 min = 300 s
Integrating equation (i), we get:

The temperature of the body falls from 60°C to 30°C in time = t ’
Hence, we get:

Equating equations (ii) and (iii), we get:

Therefore, the time taken to cool the body from 60°C to 30°C is 10 minutes.
For getting more assistance on the remaining queries we would request you to kindly ask only single query in each thread

Where,
Temperature of the body = T
Temperature of the surroundings = T 0 = 20°C
K is a constant
Temperature of the body falls from 80°C to 50°C in time, t = 5 min = 300 s
Integrating equation (i), we get:

The temperature of the body falls from 60°C to 30°C in time = t ’
Hence, we get:

Equating equations (ii) and (iii), we get:

Therefore, the time taken to cool the body from 60°C to 30°C is 10 minutes.
For getting more assistance on the remaining queries we would request you to kindly ask only single query in each thread
Similar questions