Answer:
Radio, sound communication by radio waves, usually through the transmission of music, news, and other types of programs from single broadcast stations to multitudes of individual listeners equipped with radio receivers. ... About 1945 the appearance of television began to transform radio's content and role.
Explanation:
Answer:
<em>The cost per week of electricity is Rm 46.8</em>
Explanation:
<u>Electrical Power and Energy</u>
The electrical power consumed by an appliance connected to a voltage V and carrying a current I is given by:
P = V.I
The energy consumed by an electrical appliance of power P during a time t is:
E = P.t
The electrical equipment in an office takes I=13 A when connected to a V=240 V supply.
The power consumed is:
P = 240 V * 13 A
P = 3,120 Watt
Converting to Kilowatt:
P = 3,120/1,000 KW
P = 3,12 KW
If the equipment is used t=30 hours each week, the energy is:
E = 3.12 KW * 30 h
E = 93.6 KWh
Since the cost of each KWh is Rm 0.50, the weekly cost of electricity is:
C = 93.6 * 0.50 = 46.8
The cost per week of electricity is Rm 46.8
Answer:
an armature a permanent magnet brushes slip rings
Explanation:
I think this is correct, but I am not entirely certain.
Find the force constant of the spring:
F = - KX
(0 - 62.4) = -K(0.172m)
-362.791 = -K
362.791 N/m = K
Find the work done in stretching the spring:
W = (1/2)KX
W = (1/2)(362.791)(0.172m)
W = 31.2 J
Answer:
F = 1.3*10⁻⁹ N
Explanation:
If we can approximate both charged objects as point charges, the force that one object exerts on the other, in magnitude, is given by Coulomb's Law, as follows:
![F=\frac{k*q1*q2}{r^{2}} (1)](https://tex.z-dn.net/?f=F%3D%5Cfrac%7Bk%2Aq1%2Aq2%7D%7Br%5E%7B2%7D%7D%20%281%29)
where k = 9.0*10⁹ N*m²/C², q₁ = e = 1.6*10⁻¹⁹ C, q₂ = +3.0*10⁻⁶ C and r=0.0018 m.
Replacing all these values in (1), we can solve for F as follows:
![F=\frac{(9e9 N*m2/C2)*1.6e-19C*3.0e-6C}{(0.0018m)^{2}} = 1.3e-9 N](https://tex.z-dn.net/?f=F%3D%5Cfrac%7B%289e9%20N%2Am2%2FC2%29%2A1.6e-19C%2A3.0e-6C%7D%7B%280.0018m%29%5E%7B2%7D%7D%20%3D%201.3e-9%20N)
⇒ F = 1.3*10⁻⁹ N