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In response to the school's "energy conservation and environmental protection" initiative, Xiao Lin changed to go to school by bike instead of by bus. The distance between Xiao Lin's home and school is 3km, and he can get to school by bike in 10min? (2) If the average resistance of the bicycle is 80N, how much work has he done to overcome the resistance during this period of riding?
(1) S = 3km = 3000m, t = 10min = 600s, the average speed of riding: v = st = 3000m600s = 5m / S; (2) the work of Xiaolin riding for 10min to overcome the resistance: w = FS = 80N × 3000m = 2.4 × 105J; a: (1) the average speed of Xiaolin riding is 5m / S. & nbsp; (2) during this period of riding
Xiao Li lives near Shuangxiu Park in Beijing. He goes to school in the Third Affiliated School of Beijing Normal University. He takes the shortest bus to and from school every day. When does he get off
367 road about 20 minutes / 1.3 km
Walk 80 meters from Shuangxiu park to Madianqiao west station
Take no.367 bus stop (or 361, 123, Yuntong 101, 967, 671, Yuntong 201), and get off at North Taipingqiao west station
Walk 480 meters to the Third Affiliated Middle School of Beijing Normal University
The distance between the school and the county is 28km. In addition to taking a bus, you also need to walk for a certain distance. The speed of the bus is 36km / h, and the speed of the walk is 4km / h. The whole journey takes one hour. Then the walking time is_______ min.
Set the walking time as X hours and the bus time as (1-x) hours
36*（1-X）+4*X=28
36-36X+4X=28
8=32X
X=1/4
Walking time: 1 / 4 * 60 = 15 minutes
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