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allochka39001 [22]
3 years ago
7

The first asteroid to be discovered is Ceres. It is the largest and most massive asteroid in our solar system’s asteroid belt, h

aving an estimated mass of 3.0 x 10^21 kg and an orbital speed of 17900 m/s. Determine the amount of kinetic energy possessed by Ceres.
Physics
1 answer:
stira [4]3 years ago
3 0

Answer:

4.81*10^{29}J

Explanation:

Since the formula for kinetic energy of an object is:

E_k = \frac{mv^2}{2}

Where m is the mass of the object and v is the speed. We can substitute m = 3*10^{21}kg and v = 17900m/s:

E_k = \frac{3*10^{21} * (17900)^2}{2} = 4.81*10^{29}J

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A sports car starts from rest at an intersection and accelerates toward the east on a straight road at 8.0 m/s2. Just as the spo
kobusy [5.1K]

Answer:

a)  t = 4.5 s , b)    x = 81 m

Explanation:

a) For this problem we will use kinematic relationships

For the car

        x = v₀ t + ½ a₁ t²

Since the car kicks from rest, the initial speed is zero

         x = ½ a₁ t²

For the bus

        v₂ = x / t

       x = v₂ t

At the point where they are located it has the same position, so we can match the equation

       ½ a₁1 t² = v₂ t

       ½ a₁ t = v₂

        t = 2 v₂ / a₁

Let's calculate

       t = 2 18 /8.0

       t = 4.5 s

b) to find the position

        x = v₂ t

        x = 18   4.5

        x = 81 m

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3 years ago
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According to Newton's first law of motion, if there is no net force (unbalanced forces) acting on an object that is moving at a
konstantin123 [22]
The answer is D and this response has to be 20 characters long
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Evgesh-ka [11]

Answer:

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Explanation:

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