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o-na [289]
3 years ago
11

Which explanation describes the forces involved for a person to walk down the sidewalk? A. The person's feet push backward on th

e sidewalk; the sidewalk pushes backward on the person. B. The person's feet push forward on the sidewalk; the sidewalk does not push on the person. C. The person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. D. The person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.
Physics
2 answers:
Art [367]3 years ago
8 0

Answer:

C. The person's feet push backward on the sidewalk; the sidewalk pushes forward on the person.

Explanation:

Newton's third law states that for every action, there is equal and opposite reaction. It is also known as action-reaction principle. A person is able to walk on sidewalk by pushing the sidewalk backwards. Then, the sidewalk pushes the person's feet forward.

<u>Action:</u> The person's feet push backward on the sidewalk.

<u>Reaction:</u> The sidewalk pushes forward on the person.

cluponka [151]3 years ago
6 0

C. The person's feet push backward on the sidewalk; the sidewalk pushes forward on the person.

This is due to our kick back motion forced on the sidewalk when we walk, and the resistance of us walking on it createsa push forward.

Hope this helps!

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You are performing a double slit experiment very similar to the one from DL by shining a laser on two nattow slits spaced 7.5 x
Blizzard [7]

Complete Question

You are performing a double slit experiment very similar to the one from DL by shining a laser on two nattow slits spaced 7.5 * 10^{-3} meters apart. However, by placing a piece of crystal in one of the slits, you are able to make it so that the rays of light that travel through the two slits are Ï out of phase with each other (that is to say, Ao,- ). If you observe that on a screen placed 4 meters from the two slits that the distance between the bright spot closest to center of the pattern is 1.5 cm, what is the wavelength of the laser?

Answer:

The  wavelength is  \lambda  =  56250 nm

Explanation:

From the question we are told that

   The  distance of slit separation is  d =  7.5 *10^{-3} \  m

   The  distance of the screen is  D =  4 \  m

    The  distance between the bright spot closest to the center of the interference  is  k   = 1.5 \ cm = 0.015 \  m

   

Generally the width of the central  maximum fringe produced is mathematically represented as

        y  =  2 *  k  = \frac{ D  *  \lambda}{d}

  =>    2 *  0.015 =  \frac{ \lambda  *  4}{ 7.5 *10^{-3}}

   =>   \lambda  =  56250 *10^{-9} \ m

=>      \lambda  =  56250 nm

7 0
3 years ago
What happens to the energy of a wave as it moves away from its source?
Eddi Din [679]

Answer:

As the particles move further away from their normal position (up towards the wave crest or down towards the trough), they slow down.

Explanation:

This means that some of their kinetic energy has been converted into potential energy – the energy of particles in a wave oscillates between kinetic and potential energy. Hope that this helps you and have a great day :)

3 0
3 years ago
Who is known as the "father of modern chemistry" because he first organized all known elements into four different
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D. Henry Moseley

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3 years ago
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A magnetic compass is placed near an insulated copper wire. When the wire is connected to a battery and a current is created, th
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Every current through a wire produced a magnetic field. And since the magnetic field of Earth is weak, it will get attracted towards the wire.
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A 10 kg rock that has been dropped from a 60 meter high cliff experiences an average force of air resistance of 30 N. Calculate
lesya692 [45]

Answer:

4086 J

Explanation:

The potential energy is transformed to kinetic energy less the frictional energy. Potential energy= mgh where m represent mass, g is acceleration due to gravity and h is the height of cliff

Since we have force of air resistance, work done due to air resistance will be product of force and distance

mgh-Fh= 0.5mv^{2}= KE

Substituting 10 Kg for m, 9.81 for g and 60 m for F then the kinetic energy at the bottom will be

KE= 10*9.81*60- (30*60)=4086 J

8 0
3 years ago
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