Suppose the circumference of a bicycle wheel is 2 meters. if it rotates at 1 revolution per second when you are riding the bicycle, then your speed will be: a) 3.14 m/s. b) 1 m/s. c) 2 m/s. d) 3 m/s. e) 6.28 m/s.

(c) speed will be 2 m/sec

Explanation:

We have given circumference C = 2 meters

Angular velocity = 1 rev/sec =1×2π rad/sec

We know that circumference , where r is the radius of circumference

So

r = 0.318 meter

Linear velocity

So option C will be the correct option

the results is a decrease in air temperature with an increase of altitude.

explanation:

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.