Answer:
A laser-Doppler vibrometer identifies the Doppler effect or shift of laser light reflected from the sample object
Explanation:
A laser-Doppler vibrometer (e.g. Micro Motion Analyzer 400 from Polytec) identifies the Doppler effect or shift of laser light reflected from the sample object .At a beam splitter, a laser beam is partitioned into a measuring beam and a reference beam that deflects 90 ° upwards and transmit to the reference mirror "RM." Both beams come back to the beam splitter.
Answer:
M10 × 1.5
least number of threads is 4.3
Explanation:
given data
static tensile load = 4 kN = 4000 N
safety factor = 5
coarse‐thread metric = 5.8
solution
we know that proof load for 5.8 class is Sp = 380 MPa
so area of cross section is express as
area = \frac{force \times FOS}{Sp} ......................1
area = \frac{4000 \times }{380}
area = 52.6 mm²
so by table at 58 mm² we can say we resist M10 × 1.5
and
bolt tensile strength is express as
bolt tensile strength = nut shear strength ......2
so here bolt tensile strength = At × Sy (bolt) ...............3
and nut shear strength = πd ( 0.75 t ) Sys
nut shear strength = π × 10 × ( 0.75 t ) × 0.58 × × Sy(bolt) ............4
so from equation 3 and 4 we get
t = 6.37 mm
and
for the pitch is = 1.5 mm
least number of threads is 4.3
Answer: 26 feet
Explanation:
Federal law requires that when a boat of 26ft or more is on lakes, rivers, or in the ocean 3 miles from shore, it should "prominently posted" placards about garbage as well as Oil Discharges stating that oil discharges are not allowed as well as what materials can and are prohibited from being thrown from the boat into the water.
Both placards should be permanently attached with a minimum size of 5*9 inches and made entirely of durable material.
I have attached an example of the placard.
