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3 years ago

Which two pieces of evidence most directly support the idea that the universe is expanding from one original point?

Physics

2 answers:

Goryan [66]3 years ago

5 0

Answer:

it is option 3

Explanation:

because as red shift occurs when object in a space is far from us, so many of the stars we know will be seen in red shift because they are far from us by 20 years the most of the starts we see will be in red shift

Firdavs [7]3 years ago

3 0

Answer:

The redshift of light from galaxies and the uniform distribution of cosmic background radiation

Explanation:

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The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 5.0 rev/s in 9.0 s. At thi

sertanlavr [38]

Answer

given,

angular speed of the tub = 5 rev/s

time = 9 s

he tub slows to rest = 15.0 s

the angular acceleration

$\omega_f - \omega_i = \alpha t$

$\alpha = \dfrac{5-0}{9}$

$\alpha = 0.556 rev/s^2$

angular displacement

$\theta_1 = \omega_i \ t + \dfrac{1}{2}\alpha t^2$

$\theta_1 = \dfrac{1}{2}\times 0.556 \times 9^2$

$\theta_1 = 22.52 rev$

$\theta_1 = 23 rev$

case 2

now,

$\omega_i = 5 rev/s$

$\omega_f = 0 rev/s$

time = 15 s

the angular acceleration

$\omega_f - \omega_i = \alpha t$

$\alpha = \dfrac{0-5}{15}$

$v\alpha =-0.333 rev/s^2$

angular displacement

$\theta_2 = \omega_i \ t + \dfrac{1}{2}\alpha t^2$

$\theta_2 =5\times 15 -\dfrac{1}{2}\times 0.333 \times 15^2$

$\theta_2 = 37.875 rev$

$\theta_2 =38 rev$

total revolution in 24 s

= 23 + 38

= 62 revolution

8 0

3 years ago

Dos cargas puntuales (q1 y q2 ) se atraen inicialmente entre sí con una fuerza de 550 N , si la separación entre ellas es de 90

antiseptic1488 [7]

Answer:

q2 = 9.02*10^{-4}C

Explanation:

To find the value of the other charge you use the Coulomb's law:

$F=k\frac{q_1q_2}{r^2}$

k: Coulomb's constant = 8.98*10^{9}Nm^2/C^2

q1: charge 1 = 55*10^{-6}C

r: distance between charges = 90cm = 0.9m

F: electric force = 550N

By doing q2 the subject of the formula and replacing you obtain:

$q_2=\frac{r^2F}{kq_1}=\frac{(0.9m)^2(550N)}{(8.98*10^9Nm^2/C^2)(55*10^{-6}C)}=9.02*10^{-4}C$

hence, the value of the other charge q2 is 9.02*10^{-4}C

6 0

3 years ago

What<br> are the properties of magnets?

babymother [125]

Answer:

Attractive Property – Magnet

Explanation:

attracts ferromagnetic materials like iron, cobalt, and nickel. Repulsive Properties – Like magnetic poles repel each other and unlike magnetic poles attract each other. Directive Property – A freely suspended magnet always points in a north-south direction.

8 0

3 years ago

Un bloque de 750 kg es empujado hacia arriba por una pista inclinada 15º respecto de la horizontal. El coeficiente de rozamiento

kotegsom [21]

Answer:

4776.98 N is the minimum force to start the rise.

Explanation:

We can use the first Newton's law to find the minimum force to move the block.

So we will have:

$F-W_{x}-F_{f}=0$

Where:

F is the force
W(x) is the weight of the block in the x direction, W = mg*sin(15)
F(f) is the static friction force (F(f) = μN), μ is the static friction coefficient 0.4.

$F=W_{x}+F_{f}=mgsin(15)+\mu N$

$F=mgsin(15)+\mu mgcos(15)$

$F=mg(sin(15)+\mu cos(15))$

$F=750*9.81(sin(15)+0.4*cos(15))$

$F=4776.98 N$

Therefore 4776.98 N is the minimum force to move the block.

I hope it helps you!

8 0

3 years ago

A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at eye level) by t

marishachu [46]

At the highest point of the trajectory the vertical component will have its zero velocity, and the descent caused by the force of gravity will begin.

Since the ball is thrown with a certain speed, the vertical component reaches its highest point (upwards), until returning to the receiver who will receive the ball with the same vertical component but in the opposite direction (downwards).

Therefore the vertical component will have its highest value at launch.

8 0

3 years ago