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Kamila [148]
3 years ago
8

PLzzzzzzzzzzzz helppppppppp I NEEDSSSS HELPPP!!!!!!!!!!!

Physics
1 answer:
Marta_Voda [28]3 years ago
7 0

Answer:

B. Planets orbit a star, while moons orbit a planet

Explanation:

Every planet must orbit a star, like how the Earth orbits the Sun (the star of our solar system). Our moon orbits Earth. On other planets, there can be dozens of moons orbiting it.

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Ohm's Law for electrical circuits is stated Vequals​RI, where V is a constant​ voltage, R is the resistance in ohms and I is the
Annette [7]

Answer:

The resistance interval is  R  =  1.8 \pm  0.037

Explanation:

From the question we are told that

     The voltage is  V  =  9 V

      The current is  I = 5 \pm 0.1

The maximum current would be  

       I_{max} = 5 + 0.1 =  5.1 \ A

The minimum current would be  

      I_{min} = 5 -  0.1 =  4.9 \ A

The maximum resistance is  

      R_max =  \frac{V}{I_{min}}

     R_max =  \frac{9}{4.9}

     R_max =  1.837 \Omega

The minimum resistance is  

      R_{min} =  \frac{V}{I_{max}}

    R_{min} =  \frac{9}{5.1}

    R_{min} = 1.765 \Omega

and  R  =  \frac{9}{5}  =  1.8 \Omega

The  interval R  lies is  

        R  =  1.8 \pm  0.037

4 0
3 years ago
the total mass of the sun is about 2×1030 kg, of which about 76 % was hydrogen when the sun formed. however, only about 14 % of
likoan [24]

The total amount of mass in the Sun is 2.0 x 10^30 kg, 5% of whig is hydrogen, and 13% of which becomes available for fusion. Thus, the total mass of hydrogen available for fusion over the Sun's lifetime is simply 13% of 75% of the total mass of the Sun or:

2.0 x 10^30 kg x .75 x .13

=<u> 1.95 x 10^29 kg</u>

<u />

Nuclear fusion occurs only in the core of the sun where temperature pressure and density are highest. The photosphere can be seen with visible light telescopes, the chromosphere with ultraviolet telescopes, and the corona most easily with X-ray telescopes.

The Sun is a typical star and also the closest star to the Earth. It is composed of 73% hydrogen, 25% helium, and 2% other elements. Since the gravitational pull of the sun on the earth is the centripetal force that causes the earth to move in a circular motion around the sun, we can use Newton's law of universal gravitation to find the mass of the sun without visiting it.

Learn more about The temperature here:- brainly.com/question/24746268

#SPJ4

3 0
1 year ago
5 Trajectoire d'un astéroïde
Allisa [31]

Answer:

black

Explanation:

looks like a  ballsack

8 0
3 years ago
A toboggan approaches a snowy hill moving at 11.7 m/s. The coefficients of static and kinetic friction between the snow and the
soldi70 [24.7K]

Answer:

The acceleration of the toboggan going up and down the hill is 8.85 m/s² and 3.74 m/s².

Explanation:

Given that,

Speed = 11.7 m/s

Coefficients of static friction = 0.48

Coefficients of kinetic friction = 0.34

Angle = 40.0°

(a). When the toboggan moves up hill, then

We need to calculate the acceleration

Using formula of acceleration

a=g(\sin\theta+\mu_{k}\cos\theta)

Put the value into the formula

a=9.8(\sin40+0.34\times\cos40)

a=8.85\ m/s^2

(b). When the toboggan moves up hill, then

We need to calculate the acceleration

Using formula of acceleration

a=g(\sin\theta-\mu_{k}\cos\theta)

Put the value into the formula

a=9.8(\sin40-0.34\times\cos40)

a=3.74\ m/s^2

Hence, The acceleration of the toboggan going up and down the hill is 8.85 m/s² and 3.74 m/s².

5 0
3 years ago
An object of mass m is dropped from a height h above the surface of a planet of mass M and radius R. Find the speed of the objec
Shtirlitz [24]

Answer:

v=\sqrt{\frac{2GMh}{R^{2}}}

Explanation:

mass of object = m

Mass of planet = M

Radius of planet = R

Height = h

Let the speed of the object as it hits the earth's surface is v.

the value of acceleration due to gravity

g = G M / R^2

where, g is the universal gravitational constant.

Use third equation of motion

v^{2}=u^{2}+2gh

where, u is the initial velocity which is equal to zero.

So, v^{2}=0 + 2 \times \frac{GM}{R^{2}}\times h

v=\sqrt{\frac{2GMh}{R^{2}}}

8 0
4 years ago
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