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NNADVOKAT [17]
4 years ago
15

Astronomers infer that the universe is expanding because distant galaxies all appear to ________. Astronomers infer that the uni

verse is expanding because distant galaxies all appear to ________. rotate rapidly be made mostly of dark matter be moving away from us, with more distant ones moving faster be growing in size
Physics
1 answer:
valina [46]4 years ago
8 0

Answer:

Stretch and moving away from us, with more distant ones moving faster

Explanation:

Astronomers observed that the entire universe is getting bigger because distant galaxies appears to be moving away from us

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An airplane starts from rest and reaches a takeoff velocity of 60.0m/s due north in 4.0s. How far has it traveled before take of
lions [1.4K]
Initial velocity, u = 0
Final velocity, v = 60 m/s  (at take off)
Duration of the acceleration, t = 4 s

Calculate average acceleration.
a = (v - u)/t
   = (60 m/s)/(4 s)
   = 15 m/s²

Calculate the distance traveled during acceleration.
s = ut + (1/2)*a*t²
   = 0.5*(15 m/s²)*(4 s)²
   = 120 m

Answer: 120 m

3 0
3 years ago
Please help with a simple Physics question!
zheka24 [161]

Compression- a region in a longitudinal (sound) wave where the particles are closest together. Rarefaction- a region in a longitudinal (sound) wave where the particles are furthest apart. Wave motion and particles.

Answer is B.

6 0
3 years ago
An incident ray strikes a piece of diamond at an angle of 40.5 degrees. The index of refraction of air is 1.0003 and the index o
horrorfan [7]

The angle of refraction is 15.6 deg.

When a ray of light passes from medium 1 to medium 2, the refractive index of medium 2 with respect to 1 is the ratio of the absolute refractive index of medium 2 and medium 1

_1n_2 =\frac{n_2}{n_1}

When light passes from air into diamond, with the given values of refractive indices,

_an_d =\frac{n_d}{n_a}  =\frac{2.42}{1.0003} =2.4193

According to Snell's law,

_an_d=\frac{sini}{sinr} \\  sinr=\frac{sini}{_an_d} =\frac{sin(40.5)}{2.4193}=0.2684\\   r=arcsin(0.2684)=15.57 deg

The angle of refraction is 15.6 deg

7 0
4 years ago
Read 2 more answers
Una cámara fotográfica analógica (no digital) tiene dos lentes intercambiables. Uno de foco 55mm y el otro de 200 mm. Toma una f
Sergeu [11.5K]

Answer:

f = 55mm,     h ’= -9.89 cm

f = 200 mm,  h ’= 42.5 cm

Explanation:

For this exercise let's start by finding the distance to the image, using the equation of the constructor

         \frac{1}{f} = \frac{1}{p} + \frac{1}{q}

where f is the focal length, p and q are the distances to the object and image, respectively

lens with f₁ = 55mm = 0.55cm

         \frac{1}{q} = \frac{1}{f} - \frac{1}{p}

         \frac{1}{q_1} = \frac{1}{0.55} - \frac{1}{10}

          \frac{1}{q_1} = 1.718

          q₁ = 0.582 m

lens with f₂ = 200mm = 2m

           \frac{1}{q_2} =   \frac{1}{2} - \frac{1}{10}

            \frac{1}{q_2} = 0.4

            q₂ = 2.5 m

the magnification of a lens is given by

            m = \frac{h'}{h} = -  \frac{q}{p}

             h ’= - \frac{q}{p} \ h

let's calculate for each lens

f = 55mm

             h '= - 0.582 / 10 1.7

             h ’= 0.0989 m

             h ’= -9.89 cm

f = 200 mm

             h '= - 2.5 / 10 1.7

             h ’= -0.425 m

             h ’= 42.5 cm

The negative sign indicates that the image is real and inverted

4 0
3 years ago
Different kinds of substances have different properties of metals
bagirrra123 [75]

Answer:

if this is a true or false question then it is true.

Explanation:

6 0
3 years ago
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