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Darina [25.2K]
3 years ago
9

If the forces acting on an object are balanced, the object is A. at rest or in constant motion. B. accelerating or decelerating.

C. at rest or accelerating. D. accelerating or in constant motion.
Physics
1 answer:
baherus [9]3 years ago
7 0
The answer is A. This is a statement of Newton's First Law of Motion.

Consider Newton's Second Law, which for constant mass says F = ma. If forces are balanced, F = 0. Therefore m*a = 0. Since m has a nonzero value, we find that a = 0.

The object is not accelerating when forces are balanced, i.e. it's velocity isn't changing. It is moving at a constant speed when this velocity is nonzero, and is stationary when the velocity is zero.

I hope this helps you :)
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A bus makes a 10-kilometer journey through town. It's top speed is 50 km/h and it's mean speed is 16kn/h. Explain why these spee
Maru [420]

Answer:

speed are different at different places

Explanation:

because it's top speed is 50km/h,so it's initial speed may be less. when it covers some distance it's speed changes again. then we have given a mean speed .mean speed means sum of all speed divided by sum of total time.so the mean speed and final speed differs from each other

6 0
4 years ago
Electromagnetic radiation of 8.12×10¹⁸ Hz frequency is applied on a metal surface and caused electron emission. Determine the wo
klemol [59]

Answer:

The work function ϕ of the metal = 53.4196 x 10⁻¹⁶ J      

Explanation:

When light is incident on a photoelectric material like metal, photoelectrons are emitted from the surface of the metal. This process is called photoelectric effect.

The relationship between the maximum kinetic energy (E_{k}) of the photoelectrons to the frequency of the absorbed photons (f) and the threshold frequency (f₀) of the photoemissive metal surface is:

                                        E_{k} = h(f − f₀)

                                        E_{k} = hf - hf₀

E is the energy of the absorbed photons:  E = hf

ϕ is the work function of the surface:  ϕ = hf₀

                                        E_{k} = E - ϕ

Frequency f = 8.12×10¹⁸ Hz

Maximum kinetic energy E_{k} = 4.16×10⁻¹⁷ J  

Speed of light  c = 3 x 10⁸ m/s

Planck's constant h = 6.63 × 10⁻³⁴ Js                                

                                        E = hf = 6.63 × 10⁻³⁴ x 8.12×10¹⁸

                                        E = 53.8356 x 10⁻¹⁶ J

from E_{k} = E - ϕ ;

                                        ϕ = E - E_{k}

                                        ϕ = 53.8356 x 10⁻¹⁶ - 4.16×10⁻¹⁷

                                        ϕ = 53.4196 x 10⁻¹⁶ J

The work function of the metal ϕ = 53.4196 x 10⁻¹⁶ J      

4 0
3 years ago
Two objects attract each other gravitationally. If the mass of each object doubles, how does the gravitational force between the
madam [21]

Answer:

The gravitational force between them quadruples

Explanation:

According to law of gravitation, the force of attraction (F) between two masses m1 and m2 is directly proportional to the product of the masses and inversely proportional to the square of the distance(r) between them. Mathematically,

F1 = Gm1m2/r²... 1

If their masses doubles, the formula becomes;

F2 = G(2m1)(2m2)/r²

F2 = 4Gm1m2/r² ... 2

Dividing equation 2 by 1, we have;

F2/F1 = {4Gm1m2/r²}÷{Gm1m2/r²}

F2/F1 = 4Gm1m2/r²×r²/Gm1m2

F2/F1 = 4

F2 = 4F1

The gravitational force between the masses when they doubles quadruples.

6 0
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Li2O is the molecular formula for lithium oxide.
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What happens to the shift in wavelength of the x rays if we increase the mass of the target?
andrew-mc [135]

To solve this problem it is necessary to express the term of the wavelength of continuous x-rays according to the Planck constant, the speed of light, the charge of the electron and the voltage. This definition is expressed mathematically as

\lambda = \frac{hc}{eV}

Here,

h is Planck's constant

c is speed of light

e is charge of electron

V is the potential to which the electrons are accelerated.

From this definition we can see that the wavelength is independent of the mass of the target material. Therefore the wavelength will remain the same.

5 0
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