The distance covered in one orbit is equal to the circumference of earth.
Given that radius of earth is 3959 miles.
Circumference of earth= 2πr = 2*3.14*3959 = 24875.13 miles
Speed is 26,000 miles per hour.
Since, Velocity= Distance/Time
Time= Distance/Velocity = 24875.13/26000
Time = 0.9567 hours
Therefore,
Average hour per orbit is 0.957 approximately.
Explanation:
the switch and the battery
The puck stopped so work done by friction is the same as the initial kinetic energy, 1/2*mass*velocity^2.
1/2*0.16*50^2=200J. The answer is C.
(Thx Steve)