Answer:
a) negative charges are transferred from the rod to the silk.
Explanation:
Only negative charge are transfered by electrons.
Rubbing the glass rod with the silk cause electrons to flow from the glass rod to the silk. This leaves the glass rod with a positive charge.
If you are measuring the rate of water flow, which in other words, the speed of the water flow,
Then you need to divide the water quantity by time
Answer:
(a) The maximum torque acting on the rotor is 7.40 x 10⁻⁴ N.m
(b) The peak power output of the motor is 0.300W
(c) The amount of work performed by the magnetic field on the rotor in every full revolution is 2.95x10⁻³ J
(d) The average power of the motor is 0.177 W
Explanation:
(a)
= 7.40 x 10⁻⁴ N.m
(b)
= (7.40x10⁻⁴)(3750)
= 0.300 W
(c)
In one half revolution, the work is
= 2NIAB = 2(7.40x10⁻⁴) = 1.48x10⁻³ J
In one full revolution, W = 2(1.48x10⁻³)
= 2.95x10⁻³ J
(d)
Time for one revolution is Δt = 60/3600 = 1/60s
= W / Δt
= 2.95x10⁻³ / (1/60)
= 0.177 W
By Snell's law:
η = sini / sinr. i = 25, η = 1.33
1.33 = sin25° / sinr
sinr = sin25° / 1.33 = 0.4226/1.33 = 0.3177 Use a calculator.
r = sin⁻¹(0.3177)
r ≈ 18.52°
Option A.
God's grace.