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
Ivanshal [37]
2 years ago
15

13. The

Physics
1 answer:
Andrei [34K]2 years ago
6 0

Answer:

Are you talking about aurora borealis?

Explanation:

You might be interested in
What are the principals of electric arc welding
Wewaii [24]
Principles<span> of </span>arc welding<span>. </span>Arc welding<span> is a </span>welding<span> process, in which heat is generated by an </span>electric arc<span> struck between an electrode and the work piece. </span>Electric arc<span> is luminous</span>electrical<span> discharge between two electrodes through ionized gas.</span>
7 0
3 years ago
a liquid reactant is pumped through a horizontal, cylindrical, catalytic bed. The catalyst particles are spherical, 2mm in diame
natulia [17]

Answer:

The upper limit on the flow rate = 39.46 ft³/hr

Explanation:

Using Ergun Equation to calculate the pressure drop across packed bed;

we have:

\frac{\delta P}{L}= \frac{150 \mu_oU(1- \epsilon )^2}{d^2p \epsilon^3} + \frac{1.75 \rho U^2(1-\epsilon)}{dp \epsilon^3}

where;

L = length of the bed

\mu = viscosity

U = superficial velocity

\epsilon = void fraction

dp = equivalent spherical diameter of bed material (m)

\rho = liquid density (kg/m³)

However, since U ∝ Q and all parameters are constant ; we can write our equation to be :

ΔP = AQ + BQ²

where;

ΔP = pressure drop

Q = flow rate

Given that:

9.6 = A12 + B12²

Then

12A + 144B = 9.6       --------------   equation (1)

24A + 576B = 24.1    ---------------  equation (2)

Using elimination methos; from equation (1); we first multiply it by 2 and then subtract it from equation 2 afterwards ; So

288 B = 4.9

       B = 0.017014

From equation (1)

12A + 144B  = 9.6

12A + 144(0.017014) = 9.6

12 A = 9.6 - 144(0.017014)

A = \frac{9.6 -144(0.017014}{12}

A = 0.5958

Thus;

ΔP = AQ + BQ²

Given that ΔP = 50 psi

Then

50 = 0.5958 Q + 0.017014 Q²

Dividing by the smallest value and then rearranging to a form of quadratic equation; we have;

Q² + 35.02Q - 2938.8 = 0

Solving the quadratic equation and taking consideration of the positive value for the upper limit of the flow rate ;

Q = 39.46 ft³/hr

3 0
3 years ago
Which of the following determines whether light shining on a metal surface will eject electrons from that surface?
PtichkaEL [24]
From that list, only the frequency makes the difference.

Einstein won his only Nobel Prize for his explanation of this effect.
8 0
3 years ago
9. If you placed the contents of a packet of powdered iced tea mix into a bottle of water and shook it, which of the following w
zysi [14]
 The water would be solvent. Its your answer!
4 0
3 years ago
Read 2 more answers
I have four questions.
Inga [223]

Answer:

The potential energy of the ball is 784 joules. And the kinetic energy of it is 392 while falling halfway down.

Explanation:

PE = mass (2kg) * Gravitational acceleration (9.8 m/s^2)* height (40 meters)

KE = 1/2 mass (1 kg) * velocity^2 (19.8)

7 0
3 years ago
Read 2 more answers
Other questions:
  • A delivery man pushes the button to ring the doorbell. Which of the following forms of energy is not involved in this process
    13·2 answers
  • The Global Positioning System (GPS) is a constellation of about 24 artificial satellites. The GPS satellites are uniformly distr
    11·1 answer
  • How many different values of ml are possible in the 5d sublevel?
    13·1 answer
  • An unknown material has a mass of 0.447 kg, and its temperature increases by 2.87°C when 943 J of heat are added. What is the sp
    8·1 answer
  • Which explains why more energy is released in nuclear reactions then in chemical reactions
    8·1 answer
  • Which tools would be use to find an irregularly shaped object’s mass and volume?
    11·1 answer
  • 5. What is the velocity of a 0.5 kg ball that has a momentum of 3.00 kg m/s?
    13·1 answer
  • PLEASE ANSWER THIS QUICK
    10·1 answer
  • Forest protect the soil from erosion ? True or False
    6·2 answers
  • If the mass of the sun is 1x, at least one planet will fall into the habitable zone if I place a planet in orbits___, ____, ____
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!