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Bingel [31]
3 years ago
13

Please do as the instructions say. Will give brainliest

Physics
1 answer:
lawyer [7]3 years ago
4 0

Answer:

11. 3rd law 12. 2nd law 13. 2nd law 14. 1st law 15. 3rd law 16. 1st law 17. 3rd law

18. 1st law 19. 2nd law

Explanation:

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A certain spring exerts a nonlinear force given by F(x) = −60x − 18x2 , where x is in meters and F is in newtons. A 0.90-kg bloc
tia_tia [17]

Answer:

a)  W = 6.75 J and b) v = 3.87 m / s

Explanation:

a) In the problem the force is nonlinear and they ask us for work, so we must use it's definition

      W = ∫ F. dx

Bold indicates vectors.  In a spring the force is applied in the direction of movement, whereby the scalar product is reduced to the ordinary product

     W = ∫ F dx

We replace and integrate

    W = ∫ (-60 x - 18 x²) dx

    W = -60 x²/2 -18 x³/3

Let's evaluate between the integration limits, lower W = 0 for x = -0.50 m, to the upper limit W = W for x = 0 m

    W = -30 [0- (-0.50) 2] -6 [0 - (- 0.50) 3]

    W = 7.5 - 0.75

    W = 6.75 J

b)  Work is equal to the variation of kinetic energy

    W = ΔK

    W = ΔK = ½ m v² -0

    v =√ 2W/m

    v = √(2 6.75/ 0.90)

    v = 3.87 m / s

8 0
4 years ago
When you take a stroll at night, the moon appears to “follow” you. The pictorial cue that explains this phenomenon is called
Anestetic [448]

Answer:

Motion parallax

Explanation:

5 0
3 years ago
Why won't a very bright beam of red light impart more energy to an ejected electron than a feeble beam of violet light?
bearhunter [10]
This is related to the energy carried by photons of light the energy of each photon is proportional to the frequency of the light since red light has a lower frequency then violet light and photons of red light carry less energy than the photons of violet light as a result the red protons eject electrons that have less energy than the ejected electrons by Violet photons
3 0
3 years ago
A projectile is launched with an initial velocity of 25 m/s at an angle of 30° above the horizontal. The projectile reaches maxi
Alchen [17]

Answer:

x ≈ 56 m

Explanation:

vertical initial velocity =v_{0y}(t) = 25 m/s* sin(30°)= 12.5 m/s

height = h

h =v_{0y}t+\frac{at^{2}}{2} \\\\65m = 12.5m/s*t + \frac{9.8m/s^{2}*t^{2}}{2} \\\\t=2.584 s

t- time is found solving quadratic equation.

horizontal velocity = v_{0x}=25m/s*cos(30^{o})=21.65 m/s

Horizontal velocity is constant, so distance x=v_{0x}*t =21.65 m/s *2.584 s=55.9 = 56 m

6 0
4 years ago
Two of the types of infrared light, IR-B and IR-A, are both components of sunlight. Their wavelengths range from 1400 to 3000 nm
Elis [28]

Answer:

The IR-A is the greatest energy per photon compare to that of IR-B.

Explanation:

Given that,

Wavelength of (IR-B)= 1400 nm

Wavelength of (IR-A)= 700 nm

We need to calculate the energy for IR-B

Using formula of energy

E=\dfrac{hc}{\lambda}

Put the value into the formula

E=\dfrac{6.62\times10^{-34}\times3\times10^{8}}{1400\times10^{-9}}

E=1.418\times10^{-19}\ J

The energy for IR-B is 1.418\times10^{-19}\ J

We need to calculate the energy for IR-A

Using formula of energy

E=\dfrac{hc}{\lambda}

Put the value into the formula

E=\dfrac{6.62\times10^{-34}\times3\times10^{8}}{700\times10^{-9}}

E=2.83\times10^{-19}\ J

The energy for IR-B is 2.83\times10^{-19}\ J

Hence, The IR-A is the greatest energy per photon compare to that of IR-B.

3 0
3 years ago
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