1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
LuckyWell [14K]
3 years ago
13

Why do astronomers use spectroscopes to analyze light from distant objects?

Physics
1 answer:
RoseWind [281]3 years ago
7 0
Spectroscopy — the use of light from a distant object to work out the object is made of — could be the single-most powerful tool astronomers use, says Professor Fred Watson from the Australian Astronomical Observatory. ... "It lets you see the chemicals being absorbed or emitted by the light source.
You might be interested in
Suppose an empty grocery cart rolls downhill in a parking lot. The cart has a maximum speed of 1.3 m/s when it hits the side of
Ket [755]

The cart comes to rest from 1.3 m/s in a matter of 0.30 s, so it undergoes an acceleration <em>a</em> of

<em>a</em> = (0 - 1.3 m/s) / (0.30 s)

<em>a</em> ≈ -4.33 m/s²

This acceleration is applied by a force of -65 N, i.e. a force of 65 N that opposes the cart's motion downhill. So the cart has a mass <em>m</em> such that

-65 N = <em>m</em> (-4.33 m/s²)

<em>m</em> = 15 kg

4 0
3 years ago
The diameter of a baseball is 7.4 cm and its mass is 0.15 kg. a) If a pitcher throws the baseball at a velocity of 44.3 m/s (100
Tema [17]

Answer:

drag force F_D = 1.5 \  N

Velocity (V) = 40.169 m/s

Explanation:

The drag force F_D is given  by the formula:

F_D = C_D * \frac{1}{2}* \rho * V^2*A

where:

C_D = drag coefficient depending on the Reynolds number

Reynolds number Re = \frac{\rho *V*D}{ \mu}

Let's Assume that the air is in room temperature at 25 °C ; Then

density of the air \rho = 1.1845  kg/m³

viscosity of fluid or air \mu = 1.844 × 10⁻⁵ kg/ms

diameter of the baseball D = 7.4 cm

Velocity V = 44.3 m/s

Replacing them into the equation of Reynolds number ; we have :

Re = \frac{1.1845 \ kg/m^3*44.3 m/s*0.074 m}{1.844*10^{-5}kg/ms}\\\\Re = 2.1*10^5

A = Projected Area

From the diagram attached below which is gotten from NASA for baseball;

the drag coefficient which depends on Reynolds number is read as:

C_D = 0.3

Projected Area A = \frac{\pi D^2}{4}

A = \frac{\pi 0.074^2}{4}

A = 0.0043 m²

Finally, drag force is then calculated as ;

F_D = C_D * \frac{1}{2}* \rho*V^2*A\\\\F_D = 0.3* \frac{1}{2}*1.1845 \ kg/m^3*(44.3 \ m/s) ^2*0.0043 m^2\\\\F_D = 1.5 \ N

b)

- F_D = ma

since acceleration a = \frac{dV}{dt}

Then;

-F_D = m \frac{dV}{dt}

Also;

velocity (V) = \frac{dx}{dt}

Then;

- F_D = \frac{md_2x}{dt^2}

\frac{d_2x}{dt^2}  = \frac {- F_D}{m}

F_D = 1.5 \ N\\m = 0.15 \ kg

Then;

\frac{d_2x}{dt^2}  = \frac {- 1.5 }{0.15}

\frac{d_2x}{dt^2}  =- 10

Integrating the above equation ; we have :

\frac{dx}{dt}= - 10 t + C\\

when time (t) = 0 ; then \frac{dx}{dt}= V = 44.3

44.3 = - 10 × 0 + C

C = 44.3

\frac{dx}{dt}= V = -10 t + 44.3

Time (t) =

\frac{distance }{velocity} \\\\= \frac{18.3 m}{44.3 m/s}\\\\= 0.413 s

∴ Velocity ; \frac{dx}{dt}= V = - 10t +44.3

\frac{dx}{dt}= V = - 10(0.413 s) +44.3

Velocity (V) = 40.169 m/s

6 0
3 years ago
You are riding your bike to the mall. You travel the first mile in ten minutes. The last mile takes you 15 minutes. This is an e
Valentin [98]
I'm pretty sure it's D. negative acceleration
6 0
2 years ago
Một vật nhỏ khối lượng m = 200g được treo vào một lò xo khối lượng không đáng kể, độ cứng k = 80N/m. Kích thích để con lắc dao đ
Alexandra [31]

Explanation:

what is this language? ..............

6 0
2 years ago
Please Help:
Vinil7 [7]
... The torpedo gets 20m farther away every second.
... After 100s, it's 2,000m away.

... It explodes.

... They hear it 101.4s after it was launched.
... That's 1.4s after the explosion.
... The sound covered the 2,000m back to them in 1.4 sec.

Speed = distance / time

= 2000m / 1.4s = 1,428.6 m/s (rounded)
8 0
3 years ago
Other questions:
  • A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. the average braking force is
    14·1 answer
  • How do you make magnetic and static forces strong or week?
    6·1 answer
  • Give an example of a reputable website
    14·2 answers
  • Which of the following is a mixture?
    13·1 answer
  • Calculate the final velocity right after a 117 kg rugby player who is initially running at 7.45 m/s collides head‑on with a padd
    12·1 answer
  • a 5.00 kg plane is speeding up on the ground with an applied force of 706 N. If the net force is 450 N, what would be the force
    6·1 answer
  • Bernoulli's principle is responsible for most of the lift produced by an airplane wing.
    11·1 answer
  • A parachutist of mass 56.0 kg jumps out of a balloon at a height of 1400 m and lands on the ground with a speed of 5.10 m/s. How
    10·1 answer
  • A drill has a density of 11.342 g/cm3. Its mass is 1500 g. What is the volume of the drill? Round to TWO decimal places.
    6·1 answer
  • ____________ is a medium-sized flat-topped hill with cliff-face sides that is taller than it is wide.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!