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3 years ago

How Does A Shoe Box Solar Cooker Work?

Engineering

1 answer:

Natalija [7]3 years ago

4 0

Answer:

the sun gives off light while at the same time gives off heat. the shoe box cooker takes that heat and light and reflects it around the shoe box. then the heat settles down into whatever is in the shoe box. the heat after being reflected around the shoe box is magnified by the foil wrapped in the box thus allowing the food or drink to be heated. the foil is a conductor of heat because it is metal .

Explanation:

hope this helps!

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A seasonal color change helps animals in the Taiga to

Len [333]

Answer:

Evade predators

Explanation:

The taiga forest biome which is located in the subartic region bounded by the tundra and the temperate forests in the North and South respectively, extends across the continents of North America, Europe and Asia forms the most enormous land ecosystem of related plants and animals on Earth

In the taiga, the colors of the furs of some animals change with the season such that they are become obscured to potential predators in the taiga

Animals that are able to have a camouflage that enables them to evade predators include

1) Ermine changes color from dark brown coat in the summer to white in the winter

2) Crossbill changes color from orange-brown in the summer to white in the winter

3) Snowshoe Hare changes color from brown in the summer to white in the winter.

5 0

4 years ago

2. The moist weight of 0.1 ft3 of soil is 12.2 lb. If the moisture content is 12% and the specific gravity of soil solids is 2.7

adell [148]

The answers to dry unit weight, void ratio, porosity, degree of saturation, volume occupied by water are respectively;

γ_d = 108.93 lb/ft³; e = 0.56; n = 0.36; S = 0.58; V_w = 0.021 ft³

<h3>Calculation of Volume and Weight of soil</h3>

We are given;

Moist weight; W = 12.2 lb

Volume of moist soil; V = 0.1 ft³

moisture content; w = 12% = 0.12

Specific gravity of soil solids; G_s = 2.72

A) Formula for dry unit weight is;

γ_d = γ/(1 + w)

where γ_w is moist unit weight as;

γ_w = W/V

γ_w = 122/0.1 = 122 lb/ft³

Thus;

γ_d = 122/(1 + 0.12)

γ_d = 108.93 lb/ft³

B) Formula for void ratio is;

e = [(G_s * γ_w)/γ_d] - 1

e = [(2.72 * 122)/108.93] - 1

e = 0.56

C) Formula for porosity is;

n = e/(1 + e)

n = 0.56/(1 + 0.56)

n = 0.36

D) Formula for degree of saturation is;

S = (w * G_s)/e

S = (0.12 * 2.72)/0.56

S = 0.58

E) Volume occupied by water is gotten from;

V_w = S*V_v

where;

V_v is volume of voids = nV

V_v = 0.36*0.1

V_v = 0.036 ft³

Thus;

V_w = 0.58 * 0.036

V_w = 0.021 ft³

Read more about Specific Gravity of Soil at; brainly.com/question/14932758

4 0

3 years ago

What is the base unit in standard measurement

Stella [2.4K]

Answer:

Explanation:SI is the base unit for standard measurement

7 0

3 years ago

Read 2 more answers

Design a 10-to-4 encoder with inputs in the l-out-of-10 code and outputs in a code like normal BCD except that input lines 8 and

zvonat [6]

Answer:

See image attached.

Explanation:

This device features priority encoding of the inputs

to ensure that only the highest order data line is en-

coded. Nine input lines are encoded to a four line

BCD output. The implied decimal zero condition re-

quires no input condition as zero is encoded when

all nine datalinesare athigh logic level. Alldata input

and outputs are active at the low logic level. All in-

puts are equipped with protection circuits against

static discharge and transient excess voltage.

6 0

4 years ago

A 50kg block of nickel at 90°C is dropped into an insulated tank that contains 0.5 m3 of liquid water at 25°C. Determine the fol

Valentin [98]

Answer:

a).Control volume

b). $C_{nickel}$ = 502.416 J/kg-K

c). $C_{water}$ = 4.187 kJ/kg-K

d). $T_{2}$ = 87.91°C

Explanation:

a). It is a control volume system because mass is varying in the system.

b). Specific heat of nickel is $C_{nickel}$ = 502.416 J/kg-K

c). Specific heat of water is $C_{water}$ = 4.187 kJ/kg-K

d).We know that

net energy transfer = change in internal energy

$m_{nickel}\times c_{nickel}(T_{2}-T_{nickel})=m_{water}\times c_{water}(T_{2}-T_{water})$

$m_{nickel}\times c_{nickel}(T_{2}-T_{nickel})=(volume_{water}\times density_{water})\times c_{water}(T_{2}-T_{water})$

$50\times 502.416\times (T_{2}-90)=(0.5\times 1000)\times 4.187\times (T_{2}-25)$

$25120.8\times (T_{2}-90)=2093.5\times (T_{2}-25)$

$T_{2}$ = 87.91°C

6 0

3 years ago

Read 2 more answers