Answer:0.00125 watts
Explanation:
resistance=50 ohms
Current=5 milliamps
Current=5/1000 milliamps
Current =0.005 amps
power=(current)^2 x (resistance)
Power=(0.005)^2 x 50
Power=0.005 x 0.005 x 50
Power=0.00125 watts
A. 4% you divide 2000 to 500 and you get 4 which is your answer
Answer:
Explanation:
Moment of inertia of toy top = 3 x 10⁻² kgm²
Torque created = F x r
= .30 x 2.5 x 10⁻² N m
Torque = moment of inertia x angular acceleration
angular acceleration = .3 x 2.5 x 10⁻² / 3 x 10⁻²
α = .25 radian /s²
Angular displacement in 5 revolution θ = 5 x 2π = 10π radian
θ = ω₀t + 1/2 α t²
initial angular velocity ω₀ = 0
10π = 1/2 α t² = .5 x .25 t²
t² = 251.2
t = 15.85 s