2 years ago

Gold is used to make a super thin layer on the visors of astronauts' helmets because of which property in particular?

Physics

2 answers:

Radda [10]2 years ago

8 0

C gold is the best material for reflecting heat which is needed in space.

8090 [49]2 years ago

7 0

B, because gold is the most malleable substance of all.

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Which quantity has both a magnitude and a

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(2) impulse is a vector quantity. Energy has no direction, nor does power. Work is a dot product of vector quantities, which makes it a scalar.

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3 years ago

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What color will a star be with a surface temperature of 5000 6000 K?

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The color of a star would with that surface temperature would be White. Hope this helps. :)

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2 years ago

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A swimming duck paddles the water with its feet once every 1.6 s, producing surface waves with this period. The duck is moving a

emmainna [20.7K]

Answer:

0.245 m/s

0.904 m

Explanation:

$v_{d}$ = speed of duck ahead of wave

$v_{s}$ = speed of surface wave = 0.32 m/s

T = time for paddling = 1.6 s

d = spacing between the waves = 0.12 m

speed of duck ahead of wave is given as

$v_{d}$ = $v_{s}$ - $\frac{d}{T}$

$v_{d}$ = 0.32 - $\frac{0.12}{1.6}$

$v_{d}$ = 0.245 m/s

$v_{w}$ = speed of wave behind the duck

speed of wave behind the duck is given as

$v_{w}$ = $v_{s}$ + $v_{d}$

$v_{w}$ = 0.32 + 0.245

$v_{w}$ = 0.565 m/s

D = spacing between the crests

spacing between the crests is given as

D = $v_{w}$ T

D = (0.565) (1.6)

D = 0.904 m

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2 years ago

If you push a heavy box at rest, you must exert some force before it begins to move. Once its moving, you don’t have to as much

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Answer:

momentum does

Explanation:

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2 years ago

A mass of gas has a volume of 4 m3, a temperature of 290 K, and an absolute pressure of 475 kpa, when the gas is allowed to expa

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By idea gas equation we can say

$PV = nRT$

here P = pressure

V = volume

n = number of moles

R = Avagadro gas constant

T = temperature

So from above expression we can see that for constant number of moles we can say

$\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}$

$\frac{475*4}{290} = \frac{P_2*6.5}{277}$

$6.55 = 0.023*P_2$

$P_2 = 279.1 kPa$

So finally the pressure will be 279.1 kPa

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2 years ago