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3 years ago

What causes the phenomenon of "red shift" and "blue shift" in astronomy? *

Physics

2 answers:

faltersainse [42]3 years ago

6 0

Answer:

doppler effect

Explanation:

prohojiy [21]3 years ago

5 0

The entire scientific Astronomical and Cosmological community assumes that it's the Doppler effect, since that's the only existing scientific explanation for the shifts in wavelengths away from what they're supposed to be. The whole theoretical structure of the "Big Bang" and the expanding universe is built on that understanding.

If anybody ever comes along and discovers another way for electromagnetic waves to get longer or shorter on their way to us through space, then the whole big bang and expanding universe may be out the window.

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A dog pulls on a pillow with a force of 5 N at an angle of 37o to the horizontal. Find the x and y components of this force.

Paha777 [63]

Answer:

$x=3.99\ N\approx4\ N$

$y=3\ N$

Explanation:

Given :

Force with which dog pulls the pillow = 5 N

Angle of force to the horizontal = 37°

To find the $x$ and $y$ components of force.

Solution:

For a force $F$ making an angle $\theta$ with the horizontal, the

1) $x$ component or the horizontal component is given by:

$x=F\cos\theta$

2) $y$ component or the vertical component is given by:

$y=F\sin\theta$

Plugging the know values to find $x$ and $y$ components of force applied by the dog on pillow

1) $x=5\cos37\°$

∴ $x=3.99\ N\approx4\ N$ (Answer)

2) $y=5\sin37\°$

∴ $y=3\ N$ (Answer)

7 0

3 years ago

Suppose a 65.5 kg gymnast climbs a rope. What is the tension in the rope if she climbs at a constant speed

natali 33 [55]

The tension in the rope when the gymnast climbs it at constant speed is 641.9 N.

Given:

Mass of gymnast, m = 65.5 kg

The speed 'v' of gymnast is constant

Solution:

Consider the free-body diagram of the system as shown below.

Balancing forces along the vertical axis we get:

ΣFy = 0

Thus, we get:

F = ma - (1)

where, m is mass of gymnast

a is acceleration of gymnast (a = 0m/s², as the speed is constant)

Also,

F = T - mg -(2)

where, T is tension in the rope

g is acceleration due to gravity

Equating (1) & (2), we get:

ma = T - mg

Re-arranging the equation, we get:

T = m(a+g)

Applying values in above equation we get:

T = (65.5 kg)(0 m/s²+9.8 m/s²)

T = 641.9 N

Therefore, the tension in the rope when the gymnast climbs it at constant speed is 641.9 N.

Learn more about tension here:

<u>brainly.com/question/14294135</u>

#SPJ4

7 0

2 years ago

Two movers are pushing a large crate with a force of 60.0 n each. one pushes north, the other east. what is the equilibrant forc

romanna [79]

To get the solution you must need to draw a force triangle. Attach the head of the 60N north force arrow with the tail of the 60N east force arrow. The subsequent is the arrow connecting he tail and head of the two arrows.
You get a right angled triangle, and the resultant is (60^2 + 60^2) ^0.5 = 84.85 N or 85 N northeast.

8 0

3 years ago

In what speed does an object fall, if after 10 seconds it hits the surface of Earth?

Maru [420]

Answer:

98m/s

Explanation:

Given parameters:

Time = 10s

Unknown:

Final speed = ?

Solution:

To solve this problem, we use the expression below;

v = u + gt

v is the final velocity

u is the initial velocity = 0m/s

g is the acceleration due to gravity = 9.8m/s²

t is the time

so;

v = 0 + 9.8 x 10 = 98m/s

8 0

3 years ago

In which direction does gravitational force act

Sunny_sXe [5.5K]

Gravitational force pushes down on us to keep us on the ground. So it pushes in a downward direction.

4 0

3 years ago