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3 years ago

In a standard title block, the size of the

Physics

1 answer:

jeyben [28]3 years ago

8 0

The correct answer is B: a set of dimensions

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A 0.080Kg robin, perched on a power line 6 m above the ground , swoops down to snatch a worm from the ground and then returns to

raketka [301]

If the initial PE is mgh(initial) and the final PE is mgh(final) then mgh(initial)-mgh(final) should give you your change in PE.
So, without conversions your answer should be
[(.08)(9.8)(8)]-[(.08)(9.8)(6)]=change in PE which is 1.568Joules.

4 0

3 years ago

A speaker at an open-air concert emits 600 W of sound power, radiated equally in all directions.

Marina86 [1]

Answer

Given,

Sound Power, P = 600 W

a) Intensity of sound,

r = 5 m

we know,

$I = \dfrac{P}{A}$

$I = \dfrac{P}{4\pi r^2}$

$I = \dfrac{600}{4\pi\times 5^2}$

I = 1.91 W/m²

b) Sound intensity

$\beta = 10 log(\dfrac{I}{I_0})$

I₀ = 10⁻¹²

$\beta = 10 log(\dfrac{1.91}{10^{-12}})$

$\beta = 123\ dB$

c) Sound experienced by the Phil

β₁ = 123 - 23 = 100 \ dB

distance from the sound

again using sound intensity formula

$\beta = 10 log(\dfrac{I}{I_0})$

$100= 10 log(\dfrac{I}{10^{-12}})$

$I = 10^{-12}\times 10^{10}$

where, I = P/A

$\dfrac{P}{4\pi r^2} = 10^{-2}$

$r^2 = \dfrac{600}{0.04\times \pi}$

r = 69.09 m

Distance where Phil will experience same sound intensity without earplug is equal to r = 69.09 m

7 0

4 years ago

Infrared radiation has frequencies from 3.0×1011 to 3.0×1014 Hz, whereas the frequency region for radio wave radiation is 3.0×10

expeople1 [14]

Answer:

1. The speed of infrared radiation is greater than radio wave radiation

2. The wavelength of infrared radiation is less than the radio wave radiation

Explanation:

Given:

The radio wave radiation N₁ is 3x10⁵ to 3x10⁷ Hz and the infrared radiation N₂ is 3x10¹¹ to 3x10¹⁴ Hz. The speed is:

$\frac{velocity_{2} }{velocity_{1} } =\frac{3x10^{11} }{3x10^{5} } to\frac{3x10^{14} }{3x10^{7} } =1x10^{6} to1x10^{7}$

1. The speed of infrared radiation is greater than radio wave radiation

2. The wavelength is:

λ = C/N

where more C, less λ

Then, the wavelength of infrared radiation is less than the radio wave radiation

4 0

3 years ago

What are the

fiasKO [112]

checlknthfd sissExplanation: 2+3 ls g g fg

3 0

3 years ago

Why do you think the objects in each collision experience a different change in velocity?

Sphinxa [80]

Answer:

In a collision, there is a collision force which endures for some amount of time to cause an impulse. This impulse acts upon the object to change its velocity and thus its momentum

8 0

3 years ago