Please help!!! A, B, C, or D

Light reflects off the medium at a ________ angle to which it initially struck the material. pls fill in the blank for me, I can

galben [10]

Answer:

equal

Explanation:

The law of reflection states that, on reflection from a smooth surface, the angle of the reflected ray is equal to the angle of the incident ray.

4 0

3 years ago

a rural kansas watershed that is ungauged has an area of 475 acres and a main channel length of 6870 feet with an average slope

dlinn [17]

Answer:

$\mathbf{Q_p =682 \ \ ft^3/s}$

Explanation:

Given that:

Area = 475 acres

The length of the channel (L) = 6870 feet

The average water shield slope (S) = 100 feet/mile

Since; 1 mile = 5280 feet

Burst duration D = 15 min

∴

100 feet/mile = 100/5280

The average water shield slope (S) = 5/264

Using hydrograph method:

The time of concentration $t_c = 0.0078L^{0.77} S^{-0.385}$

where;

L = 6870

S = 5/264

$t_c = 0.0078(6870)^{0.77} (\dfrac{5}{264})^{-0.385}$

$t_c =32.34$ min

Since 60 min = 1 hour

32.34 min will be (32.34*1)/60

= 0.539 hour

Lag time $T_l = 0.67\times t_c$

$T_l = 0.67\times 32.34$

$T_l = 21.6678\ min$

The time to peak i.e

$T_p = \dfrac{D}{2}+ T_L \\ \\ T_p = \dfrac{15}{2}+ 21.6678 \\ \\ T_p = 29.168 \ min$

$T_r = \dfrac{T_p}{5.5} \\ \\ T_r = \dfrac{29.1678}{5.5} \\ \\ T_r = 5.30 \ min$

Since D = 15 min is not equal to $T_r$ , then we hydrograph apart from $T_r$ duration lag time.

Then;

$T_p \ ' = T_p + \dfrac{D-t_r}{4} \\ \\ T_p \ ' = 29.168 + \dfrac{15-5.30}{4} \\ \\ T_p \ ' = 31.593$

Now, we need to determine the peak discharge $Q_p$ by using the formula:

$Q_p = \dfrac{484 \times A}{T_p \ '}$

where

484 = peak factor

Recall that A = 475 acres, to miles, we have:

A = 0.7422 mile²

$T_p \ ' = 31.593/60$

∴

$Q_p = \dfrac{484 \times 0.7422}{\dfrac{31.593}{60}}$

$\mathbf{Q_p =682 \ \ ft^3/s}$

7 0

3 years ago

What cultural differences are there between the country of Sudan and its new neighbor, South Sudan?

garik1379 [7]

Until recently, Sudan and South Sudan were a unified country. Africa is mainly known for its diversity of wildlife, but there is more to be known about this continent than its wildlife. There are certain political issues in some parts of the continent that require the world’s attention. Sudan and South Sudan are such parts of the continent which one should understand.

7 0

3 years ago

The distance between two towns on a map measures 4.8cm. If the scale of the map is 1:250000 what would the actual distance be?

Archy [21]

The actual distance will be 12 km.

<u>Explanation</u>:

The scale of the map is 1:250000

1 cm in the map represents 250000 cm.

250000cm=2500 m=2.5 km

the measurement in the map is 4.8 cm

since 1 cm represents 250000 cm or 2.5 km

The actual distance represented by 4.8 cm on the map = 4.8*250000 cm =1,200,000 cm=12000 m=12 km

4 0

3 years ago

Why does israel have a highly productive economy

viktelen [127]

Answer:

Israel has a technologically advanced free market economy. Cut diamonds, high-technology equipment, and pharmaceuticals are among its leading exports. Its major imports include crude oil, grains, raw materials, and military equipment.

Explanation:

Tax rates in Israel are among the highest in the world, with income, value-added, customs and excise, land, and luxury taxes being the main sources of revenue. The government has gradually raised the proportion of indirect taxes since the l

4 0

3 years ago