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o-na [289]
2 years ago
8

A 5.1 kg black bear cub weighs 49.98 N. The cub is carried by its mother up into the safety of a white pine tree. How much GPE w

ill the cub have as he rests on a sturdy branch that's 4 m above the forrest ground? How much work did the mother bear do in carrying her cub to this height?
Physics
1 answer:
Marysya12 [62]2 years ago
4 0

Answer:

GPE = 199.92 Joules

Work = 199.92 Joules

Explanation:

A 5.1 kg beer cub weighs 49.98N

Mg = F

g = F/M

g = 49.98/5.1

g = 9.8 m/s²

GPE = mgh

GPE = 5.1 * 9.8 * 4

GPE = 199.92 Joules

The work done by the mother is equal to the GPE , because

Force*distance = work

Force = 49.98N

Distance = 4m

Work = 199.92 Joules

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Solution:


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So for the rod, initial E = KE = ½Iω² = ½ * 3.07kg·m² * (2.87rad/s)² 
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8 0
3 years ago
Think about Newton's 2nd Law, Force equals mass times acceleration. Liz puts a 1 kg weight and a 10 kg weight on identical wagon
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The escape velocity is defined to be the minimum speed with which an object of mass m must move to escape from the gravitational
s344n2d4d5 [400]

Answer:

v = √2G M_{earth} / R

Explanation:

For this problem we use energy conservation, the energy initiated is potential and kinetic and the final energy is only potential (infinite r)

        Eo = K + U = ½ m1 v² - G m1 m2 / r1

        Ef = - G m1 m2 / r2

When the body is at a distance R> Re, for the furthest point (r2) let's call it Rinf

       Eo = Ef

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      v² = 2G M_{earth} (1 / R - 1 / Rinf)

If we do Rinf = infinity     1 / Rinf = 0

       v = √2G M_{earth} / R

      Ef = = - G m1 m2 / R

The mechanical energy is conserved  

 

      Em = -G m1  M_{earth} / R

      Em = - G m1  M_{earth} / R

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6 0
2 years ago
A simple dipole consists of two charges with the same magnitude, q, but opposite sign separated by a distance d. The EDM (electr
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Answer:

a. dW = ∫pEsinθdθ  b. W = p.E

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a. We know torque τ = p × E = pEsinθ where θ is the angle between p and E

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b. So, the total work done is gotten by integrating from 90 to θ. So,

W = ∫₉₀⁰dW

= ∫₉₀⁰pEsinθdθ

= pE∫₉₀⁰sinθdθ

= pE(cosθ - cos90)

=pEcosθ

= p.E

8 0
3 years ago
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