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3 years ago

How do scientists determine motion of objects in the universe??

2 answers:

5 0

Usually, Scientists use "Parallax Method" in order to determine the different positions of an object

Hope this helps!

DerKrebs [107]3 years ago

3 0

Answer: By Doppler effect

Explanation:

The spectrum of the objects in the universe such as stars and galaxies is taken and studied. The apparent change in the frequency/wavelength of the light suggests the motion of these objects.

If the apparent frequency is greater, the light would be blue -shifted which means it is moving towards Earth and if it is red shifted, it would be moving away from the earth. This is apparent change in observed frequency is known as Doppler's effect which studied to determine the motion of objects in the universe.

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(NEED HELP BADLY)

spin [16.1K]

Answer:

The answer to your question is below

Explanation:

Data 1

mass 1 = 250

mass 2 = 250 kg

gravity constant = 6.67 x 10⁻¹¹ Nm²/kg²

distance = 8 m

Formula

$F = G\frac{m1m2}{r^{2} }$

Substitution

$F = 6.67 x 10^{-11} \frac{250 x 250}{8^{2} }$

Result

F = 0.000000065 N

Data 2

mass 1 = 1000 kg

mass 2 = 1000 kg

distance = 5 m

Substitution

$F = 6.67 x 10^{-11} \frac{1000 x 1000 }{5^{2} }$

Result

F = 0.000002667 N

8 0

4 years ago

A ball rolls off a desk at a speed of 2 m/s and lands 0.50 seconds later.

Hoochie [10]

Answer:

(a) The ball lands 1 m ahead of the desk's base.

(b) The height of the desk is 1.225 m.

Explanation:

Given:

Initial velocity of the ball is, $u_{0}=2\ m/s$

Time of flight of the ball is, $t=0.50\ s$

(a)

Let the ball fall at a distance of $x$ from the base of the desk and let the height of the desk be $y$ .

The given motion of the ball is a projectile motion that can be divided into 2 mutually perpendicular directions.

Now, considering only the horizontal motion of the ball. The ball not under the influence of any force in the horizontal direction.

Therefore, the distance covered by the ball horizontally is given as:

$x=v_0\times t\\x=2\times 0.50=1\ m$

So, the ball lands 1 m ahead of the desk's base.

(b)

Now, consider only the vertical motion of the ball. The ball is under the influence of gravity.

So, vertical distance can be obtained using Newton's equations of motion.

We use the following equation of motion:

$y-y_0=u_{oy}t+\frac{1}{2}gt^2$

Where,

$y_{0}\rightarrow \textrm{initial vertical position of ball}\\u_{oy}\rightarrow \textrm{initial vertical velocity}\\g\rightarrow \textrm{acceleration due to gravity}\\y\rightarrow \textrm{final position of ball vertically}$

Here, as the ball leaves the desk horizontally, initial velocity is only in the horizontal direction and doesn't have any component in the vertical direction. So, $u_{oy}=0\ m/s$

Plug in $y_0=h,y=0,g=-9.8,u_{oy}=0,t=0.5$ . Solve for $h$ .

$0-h=0+\frac{1}{2}(-9.8)(0.5)^2\\-h=-4.9\times 0.25\\h=1.225\ m$

Therefore, the height of the desk is 1.225 m.

6 0

3 years ago

What is the acceleration of a ball thrown vertically upward in the presence of Earth’s gravity?

timofeeve [1]

Answer:

When a ball thrown upward reaches its highest point, its velocity is? is still -9.8 m/s2. The acceleration due to gravity is always -9.8 m/s/s, regardless of the ball's velocity.

7 0

4 years ago

What type of foods do bodyguards eat give 5 examples

Rainbow [258]

They eat rice, chicken, beef, cereal they eat what we eat in a daily basis I guess

8 0

3 years ago

The SI unit of power is???

attashe74 [19]

Answer:

Watts or Wt's

Explanation:Power is the measure of how much energy or work is used per unit time. "Power" = "energy"/"time" The SI unit of power is joules per second (J/s) or Watts (W). In summary, "1 W = 1 J/s = 1 N·m/s = 1 kg·m"^2·"s"^"-3"

6 0

3 years ago