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3 years ago

At what speed does the radio wave travel?

2 answers:

8 0

Radio, infrared, ultraviolet, X-rays, gamma Ray's, and light that you can see, are all electromagnetic waves, and all travel at the "speed of light".

Exactly: 299,792,458 meters per second, in vacuum

Easier to remember: 300,000 kilometers per second, in vacuum

Slower in any material stuff. Depends on the substances.

Gelneren [198K]3 years ago

6 0

they travel the speed of light or 300,000 km per second

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The volume flow rate of the water supplied by a well is 2.0×10−4m3/s.The well is 40.0 m deep. (a) What is the power output of th

MaRussiya [10]

Answer:

a). $P=78.4W$

b). $P=392kPa$

c.) It must be at the bottom

Explanation:

Given:

Volume flow $V_f=2.0x10^{-4}m^3/s$

Well depp $h=40.m$

The power output of the pum

$W=F*d$

$F=m*g$

$m=p*V=1000kg/m^3*2.0x10^{-4}m^3}=0.2Kg$

$W=m*g*d=0.2kg*9.8m/s^2*40.0m=78.4kg*m^2/s^2$

$W=78.4J$

$P=\frac{W}{t}=\frac{78.4J}{1s}=78.4W$

The pressure of difference the pum

Δ $P=p*g*y'$

Δ $P=1000kg/m^3*9.8m/s^2*40.0m=392x10^3Pa$

$P=392kPa$

It must be at the bottom since the pressure difference is greater than atmospheric pressure, so it wouldn't be able to lift the water all the way

4 0

3 years ago

2. What is the momentum of a football of mass 500g traveling at a

Mama L [17]

Answer:

5000 ns

Explanation:

hope this helps

5 0

3 years ago

Superman attempts to drink water through a very long vertical straw. With his great strength, he achieves maximum possible sucti

Stells [14]

Answer:

10.32874 m

Explanation:

$P_a$ = Atmospheric pressure = 101325 Pa

g = Acceleration due to gravity = 9.81 m/s²

h = Height of water

$\rho$ = Density of water = 1000 kg/m³

If the walls of the tube do not collapse that means that maximum pressure inside will be the atmospheric pressure

Atmospheric pressure is given by

$P_a=\rho gh\\\Rightarrow h=\dfrac{P_a}{\rho g}\\\Rightarrow h=\dfrac{101325}{1000\times 9.81}\\\Rightarrow h=10.32874\ m$

The maximum height to which Superman can lift the water is 10.32874 m

On the Moon there is no atmosphere so no atmospheric pressure which means when the straw is placed in water water will not rise in the tube.

5 0

3 years ago

Would a pair of scissors with really long blades and a short handle be practical? Why or why not?

Lana71 [14]

Yes, for balance.hope this helped.

6 0

3 years ago

We have an object moving at 5 m/s with mass 5 kg. It undergoes a quick collision with some other object and now moves at 1 m/s.

andrey2020 [161]

Answer:

-20 kg.m/s

Explanation:

We have an object moving at 5 m/s with mass 5 kg. The initial momentum is:

pi = m × vi

pi = 5 kg × 5 m/s = 25 kg.m/s

It undergoes a quick collision with some other object and now moves at 1 m/s. The final momentum is:

pf = m × vf

pf = 5 kg × 1 m/s = 5 kg.m/s

The change in the object's momentum is:

Δp = pf - pi

Δp = 5 kg.m/s - 25 kg.m/s = -20 kg.m/s

5 0

3 years ago