Answer:
distance between the ships changing 29.255 knot
Explanation:
Given data
time = noon to 5 pm = 5 hours
A = 50 nautical miles due west of B
A = sailing west at 22 knots
B = sailing north at 20 knots
to find out
How fast is the distance between the ships changing
solution
we consider a to b distance is z and at noon ship at 90 degree angle of AB at x and y distance from AB respectively
so here z² = x² + y² ..............1
and 2z z' = 2x x' + 2y y'
so z' = ( x x' + y y' ) / z
and after 5 hours
x = 50 + 22(t) = 50 + 22(5) = 160
y = 20(t) = 20 (5) = 100
so from equation 1
z² = x² + y²
z² = 160² + 100²
z =
z = 188.68
so z' = ( x x' + y y' ) / z
z' = ( 160 (22) + 100(20) ) / 188.68
z' = 29.255
distance between the ships changing 29.255 knot
The electromagnetic waves with the greatest frequency
on the spectrum are the ones we call "gamma rays".
The electromagnetic waves with the lowest frequency
on the spectrum are the ones we call "radio waves".
Responda:
30.0066 m
Explicação:
Dado o seguinte:
Temperatura (t1) = 5 ° C
Comprimento (L1) = 30m
Temperatura (t2) = 25 ° C
Coeficiente de expansão linear do aço (α) = 11 × 10 ^ -6 ° C-1
Lembre-se:
Expansibilidade linear (α):
Alteração do comprimento / comprimento original (diferença de temperatura)
α = [ΔL / L1 (ΔT)]
α = [(L2 - L1) / L1 (T2 - T1)]
α * L1 (T2 - T1) = (L2 - L1)
11 × 10 ^ -6 * 30 (25-5) = L2 - 30
11 × 10 ^ -6 * 30 (20) = L2 - 30
11 × 10 ^ -6 * 600 = L2 - 30
6600 × 10 ^ -6 = L2 - 30
L2 = 0,0066 + 30
L2 = 30.0066m
Answer:
-78.4 cm
Explanation:
We can solve the problem by using the lens equation:
where
p is the distance of the object from the lens
q is the distance of the image from the lens
f is the focal length
Here we have
p = 80.0 cm
q = -39.6 cm (negative, because the image is on the same side as the object , so it is a virtual image)
Substituting, we find f:
Answer:
Energia cinetica=187.5 [J]
Explanation:
La energia cinetica se define por medio de la siguiente ecuacion:
Debemos convertir las unidades de kilómetros por hora a metros por segundo
Reemplazamos en la ecuacion de energia cinetica.