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DerKrebs [107]
3 years ago
10

A horizontal force of 120 N is required to push a bookcase across the floor at a constant velocity how much is the friction forc

e that acts on the sliding bookcase
Physics
1 answer:
belka [17]3 years ago
8 0

The Friction Force that acts on a sliding bookcase is -120 N

<u>Explanation:</u>

  • Frictional force is the force developed by the two surfaces where they contact and slide against each other. They mainly affected by amount of force impelled them together and by the angle and position of the object.
  •             Frictional Force F = Coefficient of friction * normal force
  • At a constant velocity, there will be no acceleration and the net force will be zero.

               Net Force        = m * a = 0

               120 - Friction   = 0

               Friction Force  = -120 N

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What is the critical angle of light traveling from vegetable oil into water
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8 0
3 years ago
An electron has a kinetic energy of 10.1 eV. The electron is incident upon a rectangular barrier of height 18.2 eV and width 1.0
podryga [215]

Answer:

factor that the electron's probability of tunneling through the barrier increase 2.02029

Explanation:

given data

kinetic energy = 10.1 eV

height = 18.2 eV

width = 1.00 nm

wavelength = 546 nm

solution

we know that probability of tunneling is express as

probability of tunneling = e^{-2CL}   .................1

here C is = \frac{\sqrt{2m(U-E}}{h}

here h is Planck's constant

c = \frac{\sqrt{2\times 9.11 \times 10^{-31} (18.2-10.1) \times (1.60 \times 10^{-19}}}{6.626\times 10^{-34}}  

c = 2319130863.06

and proton have hf = \frac{hc}{\lambda } = {1240}{546} = 2.27 ev

so electron K.E = 10.1 + 2.27

KE = 12.37 eV

so decay coefficient inside barrier is

c' = \frac{\sqrt{2m(U-E}}{h}

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so

the factor of incerease in transmisson probability is

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factor probability = 2.02029

3 0
3 years ago
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