What type of energy transformation happens in hydro-electric power?

The spectral distribution of the radiation emitted by a diffuse surface may be approximated as follows. HW 2 Q2 (a) What is the

Ronch [10]

Answer:

a) 2000 W/m² ; b) 636.94 W/m².sr ; c) 0.5

Explanation:

a)

The formula for calculation of total emissive power is:

Total emissive power = E = $\int\limits^\alpha_0$ E'λdλ

= $\int\limits^a_0$ (0)dλ + $\int\limits^b_a$ (100)dλ + $\int\limits^c_b$ (200)dλ + $\int\limits^d_c$ (100)dλ $\int\limits^e_d$ (0)dλ

where a = 5; b = 10; c = 15; d = 20; e = 25

= 0 +100(10-5) + 200(15-10) +100(20-15) + 0

= 2000 W/m²

b)

The formula for total intensity of radiation is:

I $_{e}$ = E/π = 200/3.14 = 636.94 W/m².sr

c)

Fo submissive power leaving the surface in range π/4 ≤θ≤π/2

[E(π/4 ≤θ≤π/2)]/E = $\int\limits^f_0$ $\int\limits^g_0$ $\int\limits^i_h$ Icosθsinθ dθdΦdλ

where f = infinity, g=2π, h=π/4, i=π/2

By simplifying, we get

= (-1/2)[cos(2π/2)-cos(2π/2)]

= -0.5(-1-0)

=0.5

8 0

3 years ago

Which of the following correctly describes the relative air pressure at the center of a hurricane, with respect to the horizonta

vampirchik [111]

Explanation:

The pressure of hurricane which is high decreases gradually as we move higher . The pressure is maximum at the surface . Hence the relative air pressure is higher at the surface and low at the top . Like wise the pressure is low at the center and keeps on increasing when we move outside . Hence the answer is pressure is high at surface and low aloft.

6 0

3 years ago

How strong would the gravitational attraction be (in units of Earth-pulls) between a Saturn-like planet and the Sun, if the plan

Nataly [62]

Answer:

Explanation:

be (in units of Earth-pulls) between a Saturn-like planet and the Sun, if ... ... Sun, If The Planet Is 98 Earth-masses And Is Located At 9.23 AU From The Sun?

Hope this helps! Have a splendid day!

8 0

2 years ago

A billiard ball of mass 0.28 kg hits a second, identical ball at a speed of 7.2 m/s and comes to rest as the second ball flies o

GaryK [48]

Answer:

(a) -8064 N

(b) 8064 N

Explanation:

(a)

From Newton’s law of motion, Force, F=ma where m is mass and a is acceleration.

Since acceleration is the rate of change of velocity per unit time, then where v is velocity and the subscripts f and I denote final and initial

For the first ball, the mass is 0.28 Kg, final velocity is zero since it finally comes to rest, t is 0.00025 s and initial velocity is given as 7.2 s. Substituting these values we obtain

$F=0.28\times \frac {0-7.2}{0.00025}=-8064 N$

(b)

For the second ball, the mass is also 0.28 Kg but its initial velocity is taken as zero, the final velocity of the second ball will be equal to the initial velocity of the second ball, that is 7.2 m/s and the time is also same, 0.00025 s. By substitution

$F=0.28\times \frac {7.2-0}{0.00025}=8064 N$

Here, we prove that action and reaction are equal and opposite

7 0

3 years ago

What general roles does the cell membrane play in maintaining homeostasis

mr_godi [17]

Answer:

Generally, cell membrane plays an important role in maintaining the homeostasis by controlling the substances that penetrate the cell, either entering the cell, or leaving the cell. Since the cell membrane is a phospholipid bilayer, it can control the transition of water and ions.

Explanation:

6 0

3 years ago