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3 years ago

Use Newton’s first law to explain why a book on a desk does not move

Physics

2 answers:

aleksley [76]3 years ago

6 0

Answer:

The book does not move because all the forces acting on the book are in equilibrium, creating a net force of zero magnitude on the book. Since the net force on the book is zero, this means that the book will remain in its present state of motion (which is that the book is motionless).

Explanation:

Newton's first law states that all body will remain in their present state of motion unless acted upon by an external force. In order word, a moving body should continue moving forever, and a body at rest should remain like that forever, unless they are acted upon by a force to either cause them to stop stop or to start moving respectively.

rewona [7]3 years ago

5 0

Answer:

nothing moves if anything other doesn't move it.

natural position of things is the resting

Explanation:

yeah that's it

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The state highway patrol radar guns use a frequency of 8.66 GHz. If you're approaching a speed trap driving 35.0 m/s, what frequ

otez555 [7]

Answer:

The frequency shift detected is $\Delta f =1010.3 Hz$

Explanation:

From the question we are told that

The normal frequency of the state highway patrol radar guns $f = 8.66 GHz = 8.66 *10^{9} \ Hz$

The speed of approach is $v = 35 .0 \ m/s$

Now the frequency measure by the the state highway patrol radar guns as your car approaches is mathematically represented as

$f_n = f (1 + \frac{v}{c} )$

Where c is the speed of light which a has constant value of

$c = 3.0 *10^{8 } \ m/s$

Now

$f_n - f = \frac{fv}{c} )$

=> $\Delta f = \frac{fv}{c}$

substituting values

$\Delta f = \frac{ 8.66 *10^{9} * 35}{3.0 *10^8 }$

$\Delta f =1010.3 Hz$

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4 years ago

Gas A is composed of diatomic molecules (two atoms to a molecule) of a pure element. Gas B is composed of monoatomic molecules (

dem82 [27]

Because of the number of atoms they vary

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3 years ago

Which of the following is true when an object of mass m moving on a horizontal frictionless surface hits and sticks to an object

vivado [14]

Answer:

C. The initial momentum should be equal to the final momentum due to the conservation of momentum.

$P_{initial} = mv_0\\P_{final} = (M+m)v_1\\v_1 = \frac{m}{M+m}v_0$

Since m/(M+m) < 1, v_1 > v_0.

Explanation:

Wrong -> A. Since the smaller particle still moves after the collision, it has a kinetic energy.

Wrong -> B. The total initial momentum is equal to the momentum of the smaller particle. Therefore, the momentum of the objects that stuck together is equal to that of the smaller object.

Wrong -> D. Since the bigger object is initially at rest and the surface is frictionless, the direction of motion will be the same as the direction of the smaller particle.

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3 years ago

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