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
LenaWriter [7]
3 years ago
10

The primary organ of the digestive system that produces digestive enzymes is the:Small intestine Liver Gallbladder Pancreas

Physics
1 answer:
Juliette [100K]3 years ago
5 0
Your pancreas is the organ that produces digestive enzymes
You might be interested in
Complete the table for the function rule y=3x-2​
Orlov [11]

Answer:

3 up 1 across is the answer

Explanation:

Step one: find the Y intercept( Where the line cuts the y-axis)

X = 0

Y = 3(0) (p.s cross out the (o)

y = 2

Step 2: find the gradient  (slope of the line)

rise  =  3

------    ---

Run     1

5 0
3 years ago
the magnitude of the normal force acting on a person with a mass of 70 kg standing at rest on the flat ground would be
Virty [35]

Answer: 700 Newtons

Explanation:

The normal force=mg in this scenario (I'm using g=10m/s^2). Plugging in 70 kilograms into the equation will result in a normal force of 700 newtons.

6 0
3 years ago
Read 2 more answers
A long, uninsulated steam line with a diameter of 100 mm and a surface emissivity of 0.8 transports steam at 150°C and is expose
crimeas [40]

Answer:

Heat loss per unit length = 642.358 W/m

The heat loss per unit length on a breezy day during 8 m/s speed is = 1760.205 W/m

Explanation:

From the information given:

Diameter D = 100 mm = 0.1 m

Surface emissivity ε = 0.8

Temperature of steam T_s = 150° C = 423K

Atmospheric air temperature T_{\infty} = 20^0 \ C = 293 \ K

Velocity of wind V = 8 m/s

To calculate average film temperature:

T_f = \dfrac{T_s+T_{\infty}}{2}

T_f = \dfrac{423+293}{2}

T_f = \dfrac{716}{2}

T_f = 358 \ K

To calculate volume expansion coefficient

\beta= \dfrac{1}{T_f} \\ \\ \beta= \dfrac{1}{358} \\ \\  \beta= 2.79 \times 10^{-3} \ K^{-1}

From the table of "Thermophysical properties of gases at atmospheric pressure" relating to 358 K of average film temperature; the following data are obtained;

Kinematic viscosity (v) = 21.7984 × 10⁻⁶ m²/s

Thermal conductivity k = 30.608 × 10⁻³ W/m.K

Thermal diffusivity ∝ = 31.244 × 10⁻⁶ m²/s

Prandtl no. Pr = 0.698

Rayleigh No. for the steam line is determined as follows:

Ra_{D} = \dfrac{g \times \beta (T_s-T_{\infty}) \times D_b^3}{\alpha\times v}

Ra_{D} = \dfrac{9.8 \times (2.79 *10^{-3})(150-20) \times (0.1)^3}{(31.244\times 10^{-6}) \times (21.7984\times 10^{-6})}

Ra_{D} = 5.224 \times 10^6

The average Nusselt number is:

Nu_D = \Big \{    0.60 + \dfrac{0.387(Ra_D)^{1/6}}{[ 1+ (0.559/Pr)^{9/16}]^{8/27}} \Big \}^2

Nu_D = \Big \{    0.60 + \dfrac{0.387(5.224\times 10^6)^{1/6}}{[ 1+ (0.559/0.698)^{9/16}]^{8/27}} \Big \}^2

Nu_D = \Big \{    0.60 + \dfrac{5.0977}{[ 1.8826]^{8/27}}\Big \}^2

Nu_D = \Big \{    0.60 + 4.226 \Big \}^2

Nu_D = 23.29

However, for the heat transfer coefficient; we have:

h_D = \dfrac{Nu_D\times k}{D_b} \\ \\  h_D = \dfrac{(23.29) \times (30.608 \times 10^{-3} )}{0.1}

h_D = 7.129 \ Wm^2 .K

Hence, Stefan-Boltzmann constant \sigma = 5.67 \times 10^{-8} \ W/m^2.K^4

Now;

To determine the heat loss using the formula:

q'_b = q'_{ev} + q'_{rad} \\ \\ q'_b = h_D (\pi D_o) (T_t-T_{\infty})+\varepsilon(\pi D_b)\sigma (T_t^4-T_{\infty }^4)

q'_b = (7.129)(\pi*0.1) (423-293) + (0.8) (\pi*0.1) (5.67 *10^{-8}) (423^4-293^4) \\ \\  q'_b = 291.153 + 351.205 \\ \\  \mathbf{q'_b = 642.258 \ W/m}

Now; here we need to determine the Reynold no and the average Nusselt number:

Re_D = \dfrac{VD_b}{v } \\ \\  Re_D = \dfrac{8 *0.1}{21.7984 \times 10^{-6}} \\ \\  Re_D = 3.6699 \times 10^4

However, to determine the avg. Nusselt no by using Churchill-Bernstein correlation, we have;

Nu_D = 0.3 + \dfrac{0.62 \times Re_D^{1/2}* Pr^{1/3}}{[1+(0.4/Pr)^{2/3}]^{1/4}} [1+ (\dfrac{Re_D}{282000})^{5/8}]^{4/5}

Nu_D = 0.3 + \dfrac{0.62 \times (3.6699*10^4)^{1/2}* (0.698)^{1/3}}{[1+(0.4/0.698)^{2/3}]^{1/4}} [1+ (\dfrac{3.669*10^4}{282000})^{5/8}]^{4/5}

Nu_D = (0.3 +\dfrac{105.359}{1.140}\times 1.218) \\ \\ Nu_D = 112.86

SO, the heat transfer coefficient for forced convection is determined as follows afterward:

h_D = \dfrac{Nu_{D}* k}{D_b} \\ \  h_D = \dfrac{112.86*30.608 *10^{-3}}{0.1} \\ \\  h_D = 34.5 \ W/m^2 .K

Finally; The heat loss per unit length on a breezy day during 8 m/s speed is:

q'b = h_D (\pi D_b) (T_s-T_{\infty}) + \varepsilon (\pi D_b) \sigma (T_s^4-T_ {\infty}^4) \\ \\  q'b = (34.5) (\pi *0.1) (423-293) + (0.8) (\pi*0.1) (5.67*10^{-8}) (423^4 - 293^4) \\ \\ = 1409 +351.205 \\ \\  \mathbf{q'b = 1760.205 \ W/m}

5 0
3 years ago
As the distance of a sound wave from its source quadruples, how is the intensity changed?
Naddik [55]

d. it decreases by a factor of 16

3 0
3 years ago
Read 2 more answers
How do photons help explain the photoelectric effect
iVinArrow [24]

Answer:

photon, collides with an electron and uses some of its energy to dislodge the electron.

Explanation:

7 0
3 years ago
Other questions:
  • Canola oil is less dense than water, so it floats on water, but its index of refraction is 1.47, higher than that of water. When
    7·1 answer
  • What is the new pressure of 150 ml of a gas that is compressed to 50 ml when the original pressure was 3.0 atm and the temperatu
    15·1 answer
  • A person fires a 38 gram bullet straight up into the air. It rises, then falls straight back down, striking the ground with a sp
    12·1 answer
  • "A light beam incident on a diffraction grating consists of waves with two different wavelengths. The separation of the two firs
    9·1 answer
  • A stone with a weight of 5.29 N is launched vertically from ground level with an initial speed of 26.0 m/s, and the air drag on
    13·1 answer
  • One characteristic of mass wasting processes is that they a. only operate on steep slopes. b. move materials very slowly. c. ope
    6·1 answer
  • Which of the following is occurring while a satellite is in orbit around Earth? O It is continuously pulling away from Earth It
    10·1 answer
  • 4. How much mass is required to exert a force of 25 Newtons, accelerating at 5 m/s?
    7·1 answer
  • Are there any other energies in nature capable of replacing electricity? How?
    8·1 answer
  • If a maserati. with a belocity of 6 m/s E, accelerates at a rate of 85 m/s^2 for 5 seconds, what will its velocity be?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!