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wolverine [178]
3 years ago
10

What is the kinetic energy of a jogger with a mass of 65 kg traveling at a velocity of 2.5 m/s?

Physics
2 answers:
scZoUnD [109]3 years ago
7 0
KE=203.125 J !!!!!!!!!
nekit [7.7K]3 years ago
6 0
Kinetic energy = 1/2mv2

1/2 x 65 x 2.5^2
=203.125J
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How many drops of water are in a 1.0 L bottle? (Hint: Start by estimating the diameter of a drop of water.)
o-na [289]

Answer:

N = 2000 drops approx with 1 cm diameter each

Explanation:

Let the diameter of one drop is 1 cm

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V = \frac{1}{6}\pi d^3

now we have

V = \frac{1}{6}\pi(0.01)^3

V = 0.53 \times 10^{-6} m^3

now in 1L of liquid let say N drops are there

so we have

1L = 10^{-3} m^3

now we have

N = \frac{10^{-3}}{0.53 \times 10^{-6}}

N = 2\times 10^3

so it will have approx 2000 drops in it with diameter 1 cm each drop

7 0
3 years ago
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Alecsey [184]

Answer:

  F = - 3.53 10⁵ N

Explanation:

This problem must be solved using the relationship between momentum and the amount of movement.

          I = F t = Δp

To find the time we use that the average speed in the contact is constant (v = 600m / s), let's use the uniform movement ratio

        v = d / t

        t = d / v

Reduce SI system

          m = 26 g ( 1 kg/1000g) = 26 10⁻³ kg

          d = 50 mm ( 1m/ 1000 mm) = 50 10⁻³ m

Let's calculate

         t = 50 10⁻³ / 600

         t = 8.33 10⁻⁵ s

With this value we use the momentum and momentum relationship

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As the bullet bounces the speed sign after the crash is negative

       F = m (v-vo) / t

       F = 26 10⁻³ (-500 - 630) / 8.33 10⁻⁵

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The negative sign indicates that the force is exerted against the bullet

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3 years ago
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Lilit [14]
Superconductor, conductor, semiconductor, insulator
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Sonbull [250]
The answer is C (the same number of valence electrons)
3 0
3 years ago
Please answer ASAP .
Arisa [49]

Answer:

Explanation:

a = gsinθ

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8 0
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