Answer:
hmmmmmmmm
Explanation:
mmmmmmmmmmmmmmmmmmmmmmm pay attention in class kid
I = pressure amplitude given = 0.2 W/m²
dB = decibel reading
decibel reading from the pressure amplitude is given as
dB = 10 log₁₀ (I/10⁻¹²)
inserting the values in the above equation
dB = 10 log₁₀ (0.2/10⁻¹²)
dB = 10 log₁₀ (2 x 10⁻¹/10⁻¹²)
dB = 10 log₁₀ (2 x 10⁻¹.10¹²)
dB = 10 log₁₀ (2 x 10¹²⁻¹)
dB = 10 log₁₀ (2 x 10¹¹)
dB = 113.01 db
hence the decibel reading comes out to be 113.01 db
Wire rope guardrails are supposed to be capable of withstanding a force of 200 pounds without failure, it must not deflect under pressure to less than 39 inches above the walking surface, and it must be at least a quarter inch in thickness to prevent cuts when installing around buildings. To install the metal guardrail safely, you must use a sufficient amount of clips on the wire to ensure that it will not snap under the pressure and to ensure that it is safe to walk on or use as a support.
Answer:
(a) silver
(b) 4.94 x 10^-8 ohm
Explanation:
L = 2.4 m
diameter = 5.99 mm = 5.99 x 10^-3 m
Radius, r = diameter / 2 = 2.995 x 10^-3 m
R = 1.38 x 10^-3 ohm
(a) Let ρ be the resistivity of the material
R = ρ L / A
R A / L = ρ
ρ = (1.38 x 10^-3 x 3.14 x 2.995 x 10^-3 x 2.995 x 10^-3) / 2.4
ρ = 1.62 x 10^-8 ohm-m
The material is silver.
(b) t = 1.2 mm = 1.2 x 10^-3 m
Diameter = 2.24 cm = 0.0224 m
Radius, r = 0.0112 m
Resistance, R = ρ x t / A
R = 1.62 x 10^-8 x 1.2 x 10^-3 / (3.14 x 0.0112 x 0.0112)
R = 4.94 x 10^-8 ohm
Mechanical energy is sum of kinetic energy and potential energy