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MariettaO [177]
3 years ago
6

A space probe on the surface of Mars sends a radio signal back to the Earth, a distance of 8.70 ✕ 107 km. Radio waves travel at

the speed of light (3.00 ✕ 108 m/s). How many seconds does it take for the signal to reach the Earth?

Physics
1 answer:
Ahat [919]3 years ago
3 0

Answer: 2.9 × 10 E 3 sec

Explanation: The explanation is attached

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The answer is C. If the box is accelerating, that means that the amount of force you are exerting is greater than the force of the box.

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Which of the following are true for acceleration?
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The SI unit for acceleration is m/s2 ( D)

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A cake is removed from a 350◦F oven and placed on a cooling rack in a 70◦F room. After 30 minutes the cake is 200◦F. When will i
galben [10]

Answer:

350 F to 100 F it take approx 87.33 min  

Explanation:

given data

oven = 350◦F

cooling rack = 70◦F

time = 30 min

cake = 200◦F

solution

we apply here Newtons law of cooling  

\frac{dT}{dt} = -k(T-Ta)

\frac{dy}{dt} = \frac{d}{dt} (T(t) -Ta)

= \frac{dT}{dt} -\frac{dTa}{dt} =\frac{dT}{dt} = -k(T-Ta)

-ky \frac{dy}{dt} = -ky

T(t) -Ta = (To -Ta) e^{-kt} T(t) = Ta+ (To -Ta)  e^{-kt}

put her value for time 30 min and T(t) = 200◦F and To =350◦F  and Ta = 70◦F

so here

200 = 70 + ( 350 - 70 ) e^{-k30}

k = 0.025575

so here for  T(t) = 100F

100 = 70 + ( 350 - 70 ) e^{-0.025575*t}

time = 87.33 min

so here 350 F to 100 F it take approx 87.33 min  

5 0
3 years ago
How do you compare the energies of the different parts of the electromagnetic spectrum?
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The different types of radiation in electromagnetic spectrum are compared by the amount of energy found in the photons.

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The energy associated with electromagnetic radiation is proportional to frequency and inversely proportional to wavelength. So, electromagnetic waves with shorter wavelengths have more energy.

On one end of the electromagnetic spectrum are radio waves, which have wavelengths billions of times longer than those of visible light. On the other end of the spectrum are gamma rays with wavelengths billions of times smaller than those of visible light.

To know more about electromagnetic spectrum:

brainly.com/question/27839167

#SPJ4

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The table represents the speed of a car in a northern direction over several seconds. Column 1 would be on the x-axis, and Colum
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"The table represents the speed of a car in a northern direction over several seconds. Column 1 would be on the x-axis, and Column 2 would be on the y-axis."


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