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3 years ago

10

If a planet's orbital speed is 20 km/s when it's at its average distance from the sun which is most likely orbital speed when it

is nearest the sun?

1 answer:

Alona [7]3 years ago

8 0

Answer:25km/s

Explanation:

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A child and sled with a combined mass of 58.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed o

erma4kov [3.2K]

Answer:

The height is $h = 0.5224 \ m$

Explanation:

From the question we are told that

The combined mass of the child and the sled is $m = 58.0 \ kg$

The speed of the sled is $u = 3.20 \ m/s$

Generally applying SOHCAHTOA on the slope which the combined mass is down from

Here the length of the slope(L) where the combined mass slides through is the hypotenuses

while the height(h) of the height of the slope is the opposite

Hence from SOHCAHTOA

$sin (\theta) = \frac{h}{L}$

=> $Lsin(\theta) = h$

Generally from the kinematic equation we have that

$v^2 = u^2 + 2aL$

Here the u is the initial velocity of the combined mass which is zero since it started from rest

and a is the acceleration of the combined mass which is mathematically evaluated as

$a = g * sin (\theta )$

$v^2 = u^2 + 2 * g * sin (\theta )L$

=> $2Lsin(\theta ) = \frac{v^2 - u^2 }{g}$

=> $h = \frac{ v^2 - u^2}{2g}$

=> $h = \frac{ 3.20^2 - 0^2}{2 * 9.8 }$

=> $h = 0.5224 \ m$

6 0

3 years ago

Los anillos de Saturno están compuestos de trozos de hielo que están en órbita alrededor del planeta. El radio interior de los a

Arada [10]

Explanation:

Sorry english only. I wished I answer that

3 0

3 years ago

Which of the following is true about radiation from the sun?

Lelu [443]

><span>It can travel through vacuum.

The rays must travel in the vacuum of space between Earth's atmosphere and the sun.</span>

3 0

4 years ago

An electromagnetic wave with frequency 65.0Hz travels in an insulating magnetic material that has dielectric constant 3.64 and r

lakkis [162]

Answer:

The wavelength of the wave is $1.06\times10^6 m$

Explanation:

Lets calculate

We know an electromagnetic wave is propagating through an insulating magnetic material of dielectric constant K and relative permeability $K_m$ ,then the speed of the wave in this dielectric medium is $\nu$ is less than the speed of the light c and is given by a relation

$\nu=\frac{c}{\sqrt{KK_m} }$ --------- 1

In case the electromagnetic wave propagating through the insulating magnetic material , the amplitudes of electric and magnetic fields are related as -

$E_m_a_x= \nu B_m_a_x$

The magnitude of the 'time averaged value' of the pointing vector is called the intensity of the wave and is given by a relation

$I = S_a_v$

$\frac{E_m_a_xB_m_a_x}{2K_m\mu0}$ ----------- 3

now , we will find the speed of the propagation of an electromagnetic wave by using equation 1

$\nu=\frac{c}{\sqrt{KK_m} }$

Putting the values ,

= $\nu= \frac{3.00\times10^8}{\sqrt{(3.64)(5.18)} }$

= $0.6908\times10^8m/s$

= $6.91\times10^7m/s$

Now , using this above solution , we will find the wavelength of the wave -

$\lambda=\frac{\nu}{f}$

Putting the values from above equations -

$\frac{6.91\times10^7m/s}{65.0Hz}$

$\lambda= 1.06\times10^6 m$

Hence , the answer is $\lambda= 1.06\times10^6 m$

8 0

3 years ago

What two element is present in biotite mica that is not present in muscovite mica?

lara31 [8.8K]

Potassium iron magnesium aluminum silicate hydroxide and Potassium magnesium aluminum silicate hydroxide.

3 0

3 years ago