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3 years ago

What single property was the most important in jesseca's material

Physics

1 answer:

jek_recluse [69]3 years ago

6 0

Answer:

Jesseca wanted to create a material that reflected most of the light that fell on it.

Explanation: The Graphite was the material in the passage that had reflected most of the light.

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An airplane has an effective wing surface area of 19.4 m2 that is generating the lift force. In level flight the air speed over

alexgriva [62]

Answer:

W =23807.68 N

Explanation:

given,

surface area of wing = 19.4 m²

speed over top wing = 67 m/s

speed under wing = 51 m/s

density of air = 1.3 kg/m³

weight of plane

From Bernoulli's principle

$P_1 + \dfrac{1}{2}\rho v_1^2 = P_2 + \dfrac{1}{2}\rho_2^2$

where 1 and 2 are two different locations at the same geo potential level

so if we call 1 the lower surface and 2 the upper surface,

we find the pressure differential, P₁ -P₂

$\Delta P =\dfrac{1}{2}\rho (v_2^2-v_1^2)$

$\Delta P =\dfrac{1}{2}\times 1.3 \times (67^2-51^2)$

$\Delta P =1227.2\ N/m^2$

then the force acting on the plane is

F=P A

F=1227.2 x 19.4

F =23807.68 N

weight of the plane

W =23807.68 N

7 0

3 years ago

Let's examine over the next few questions an NFL kick as described in the 3rd Law video. The announcer claimed that the ball is

hichkok12 [17]

Answer:

8451.62109367671 Newtons

Explanation:

$1\ kg=1\times 9.8066500286389=9.8066500286389\ N$

$1 \lb=2.2046226218488\ kg$

It is known that

$1\ lbs=\dfrac{9.8066500286389}{2.2046226218488}=4.4482216282508\ N$

So,

$1900\ lbs=1900\times 4.4482216282508\\\Rightarrow 1900\ lbs=8451.6210936765\ N$

The force in Newtons is 8451.6210936765 Newtons

4 0

3 years ago

If something is 50% efficient, how many joules of wasted energy will there be if 750J of energy is put in?

Andreas93 [3]

Answer:

375 J

Explanation:

Total energy = 750 J

Efficiency = 50%

Wasted energy = 50% [100% - 50%]

Amount of wasted energy

= 750 x 50%

= 750 x 0.5

= 375 J

7 0

2 years ago

Read 2 more answers

True or False? There is more downward force on a faster car than on a slower car when both

kondor19780726 [428]

Answer:

false

Explanation:

bc the faster car has more inertia (i dont think im correct)

not sure but feels like it

3 0

3 years ago

A copper rod is 0.875 m long with a rectangular cross section of dimensions 0.0515 m by 0.0855 m. The ends of the rod are held a

Goshia [24]

Answer:

heat flow is 106.1 W

Explanation:

given data

length = 0.875 m

dimensions x = 0.0515 m

dimensions y = 0.0855 m

temperature = 42.9°C and 97.7°C

thermal conductivity K = 385 W/(m⋅K)

to find out

heat flows

solution

we will apply here formula for heat flow that is

heat flow = K × Δt × A / L ..........................1

so here Δt = 97.7°C - 42.9°C = 54.8°C

and area A = xy = 0.0515 × 0.0855 = 4.40 × $10^{-3}$ m²

so put all value in equation 1 we get heat flow

heat flow = K × Δt × A / L

heat flow = 385 × 54.8 × 4.40 × $10^{-3}$ / 0.875

heat flow = 106.1

so here heat flow is 106.1 W

4 0

3 years ago