Traditional Culture Encyclopedia - Photography and portraiture - Liaoning Chaoyang cos photography
Liaoning Chaoyang cos photography
F=mgcosθ=60× 100.8N=750N
mgtanθ=mω2R
From the geometric relationship: r = r+lsinθ = 4+10× 0.6m =10m.
So the angular velocity ω = gtan θ r = 10× 34 10 radians/second = 32 radians/second.
(2) In the process of the turntable from standstill to steady speed, we can draw the following conclusions from the kinetic energy theorem:
W+(? mgh)= 12mv2? 0
h = l( 1-cosθ)= 10×( 1-0.8)m = 2m
v=ωR=32× 10m/s=53m/s
w = 12 mv2+mgh = 12×60×(53)2+60× 10×2j = 3450? J
(3) When the seat is stationary and rotates stably with the turntable, the electric energy consumed by the motor is E..
E×80%×80% = Northwest
Solution: e =10× 34500.80× 0.80j ≈ 5.4×104j.
Answer: When (1) is stable, the tension f of the wire rope on the seat is 750N, and the angular velocity ω of the turntable is 32 rad/s;
(2) The work done by the rope tension on the seat is 3450J during the period from the rest of each seat to the stable rotation of the turntable;
(3) If the efficiency of the motor driving the turntable is 80% and the mechanical power generated by the turntable rotating by itself and overcoming various friction losses is 20%, it is estimated that the electric energy consumed by the motor is 5.4× 104J. J moves from the seat to the stable rotation of the turntable.
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