Answer:
A. True
Explanation:
When an electromagnetic field wave strikes a conductor, say a wire, it induces an alternating current that is proportional to the wave in the conductor. This is a reversal of generating electromagnetic wave from accelerating a charged particle. This phenomenon is used in radio antena for receiving radio wave signals and also use in medicine for body scanning.
Complete Question
The cars of a roller-coaster ride have a speed of 19.0 km/h as they pass over the top of the circular track. Neglect any friction and calculate their speed v when they reach the horizontal bottom position. At the top position, the radius of the circular path of their mass centers is 21 m, and all six cars have the same mass.V = -18 m What is v?X km/h
Answer:

Explanation:
Velocity 
Radius 
initial velocity u
Generally the equation for Angle is mathematically given by




Generally
Height of mass



Generally the equation for Work Energy is mathematically given by

Therefore



Answer:
8.24μm
Explanation:
The theory of brittle fracture was used to solve this problem.
And if you follow through with the attachment made a the subject of the formula
Such that,
a = 2x(69x10⁹)x0.3/pi(40x10⁶)²
= 4.14x10¹⁰/5.024x10¹⁵
= 8.24x10^-06
= 8.24μm
This is the the maximum length of the surface flaw
Answer:
Poissons ratio = -0.3367
Explanation:
Poissons ratio = Lateral Strain / Longitudinal Strain
In this case, the longitudinal strain will be:
Strain (longitudinal) = Change in length / total length
Strain (longitudinal) = (8.40392 - 8.4) / 8.4
Strain (longitudinal) = 4.666 * 10^(-4)
While the lateral strain will be:
Strain (Lateral) = Change in length / total length
Strain (Lateral) = (2.09967 - 2.1) / 2.1
Strain (Lateral) = -1.571 * 10^(-4)
Solving the poisson equation at the top we get:
Poissons ratio = -1.571 / 4.666 <u>( 10^(-4) cancels out )</u>
Poissons ratio = -0.3367